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2014-06-11Merge tag 'modules-next-for-linus' of ↵Linus Torvalds1-4/+29
git:// Pull module updates from Rusty Russell: "Most of this is cleaning up various driver sysfs permissions so we can re-add the perm check (we unified the module param and sysfs checks, but the module ones were stronger so we weakened them temporarily). Param parsing gets documented, and also "--" now forces args to be handed to init (and ignored by the kernel). Module NX/RO protections get tightened: we now set them before calling parse_args()" * tag 'modules-next-for-linus' of git:// module: set nx before marking module MODULE_STATE_COMING. samples/kobject/: avoid world-writable sysfs files. drivers/hid/hid-picolcd_fb: avoid world-writable sysfs files. drivers/staging/speakup/: avoid world-writable sysfs files. drivers/regulator/virtual: avoid world-writable sysfs files. drivers/scsi/pm8001/pm8001_ctl.c: avoid world-writable sysfs files. drivers/hid/hid-lg4ff.c: avoid world-writable sysfs files. drivers/video/fbdev/sm501fb.c: avoid world-writable sysfs files. drivers/mtd/devices/docg3.c: avoid world-writable sysfs files. speakup: fix incorrect perms on speakup_acntsa.c cpumask.h: silence warning with -Wsign-compare Documentation: Update kernel-parameters.tx param: hand arguments after -- straight to init modpost: Fix resource leak in read_dump()
2014-06-05Merge branch 'x86/espfix' of ↵Linus Torvalds1-0/+4
git:// into next Pull x86-64 espfix changes from Peter Anvin: "This is the espfix64 code, which fixes the IRET information leak as well as the associated functionality problem. With this code applied, 16-bit stack segments finally work as intended even on a 64-bit kernel. Consequently, this patchset also removes the runtime option that we added as an interim measure. To help the people working on Linux kernels for very small systems, this patchset also makes these compile-time configurable features" * 'x86/espfix' of git:// Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option" x86, espfix: Make it possible to disable 16-bit support x86, espfix: Make espfix64 a Kconfig option, fix UML x86, espfix: Fix broken header guard x86, espfix: Move espfix definitions into a separate header file x86-32, espfix: Remove filter for espfix32 due to race x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
2014-06-04init/main.c: remove an ifdefAndrew Morton1-2/+0
Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04kthreads: kill CLONE_KERNEL, change kernel_thread(kernel_init) to avoid ↵Oleg Nesterov1-1/+1
CLONE_SIGHAND 1. Remove CLONE_KERNEL, it has no users and it is dangerous. The (old) comment says "List of flags we want to share for kernel threads" but this is not true, we do not want to share ->sighand by default. This flag can only be used if the caller is sure that both parent/child will never play with signals (say, allow_signal/etc). 2. Change rest_init() to clone kernel_init() without CLONE_SIGHAND. In this case CLONE_SIGHAND does not really hurt, and it looks like optimization because copy_sighand() can avoid kmem_cache_alloc(). But in fact this only adds the minor pessimization. kernel_init() is going to exec the init process, and de_thread() will need to unshare ->sighand and do kmem_cache_alloc(sighand_cachep) anyway, but it needs to do more work and take tasklist_lock and siglock. Signed-off-by: Oleg Nesterov <> Acked-by: Peter Zijlstra <> Acked-by: Steven Rostedt <> Cc: Frederic Weisbecker <> Cc: Ingo Molnar <> Cc: Mathieu Desnoyers <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04init/main.c: add initcall_blacklist kernel parameterPrarit Bhargava1-0/+68
When a module is built into the kernel the module_init() function becomes an initcall. Sometimes debugging through dynamic debug can help, however, debugging built in kernel modules is typically done by changing the .config, recompiling, and booting the new kernel in an effort to determine exactly which module caused a problem. This patchset can be useful stand-alone or combined with initcall_debug. There are cases where some initcalls can hang the machine before the console can be flushed, which can make initcall_debug output inaccurate. Having the ability to skip initcalls can help further debugging of these scenarios. Usage: initcall_blacklist=<list of comma separated initcalls> ex) added "initcall_blacklist=sgi_uv_sysfs_init" as a kernel parameter and the log contains: blacklisting initcall sgi_uv_sysfs_init ... ... initcall sgi_uv_sysfs_init blacklisted ex) added "initcall_blacklist=foo_bar,sgi_uv_sysfs_init" as a kernel parameter and the log contains: blacklisting initcall foo_bar blacklisting initcall sgi_uv_sysfs_init ... ... initcall sgi_uv_sysfs_init blacklisted [ tweak printk text] Signed-off-by: Prarit Bhargava <> Cc: Richard Weinberger <> Cc: Andi Kleen <> Cc: Josh Boyer <> Cc: Rob Landley <> Cc: Steven Rostedt <> Cc: Ingo Molnar <> Cc: Peter Zijlstra <> Cc: Frederic Weisbecker <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04init/main.c: don't use pr_debug()Andrew Morton1-2/+2
Pertially revert commit ea676e846a81 ("init/main.c: convert to pr_foo()"). Unbeknownst to me, pr_debug() is different from the other pr_foo() levels: pr_debug() is a no-op when DEBUG is not defined. Happily, init/main.c does have a #define DEBUG so we didn't break initcall_debug. But the functioning of initcall_debug should not be dependent upon the presence of that #define DEBUG. Reported-by: Russell King <> Cc: Joe Perches <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04kernel/printk: use symbolic defines for console loglevelsBorislav Petkov1-2/+2
... instead of naked numbers. Stuff in sysrq.c used to set it to 8 which is supposed to mean above default level so set it to DEBUG instead as we're terminating/killing all tasks and we want to be verbose there. Also, correct the check in x86_64_start_kernel which should be >= as we're clearly issuing the string there for all debug levels, not only the magical 10. Signed-off-by: Borislav Petkov <> Acked-by: Kees Cook <> Acked-by: Randy Dunlap <> Cc: Joe Perches <> Cc: Valdis Kletnieks <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALLFabian Frederick1-0/+10
sys_sgetmask and sys_ssetmask are obsolete system calls no longer supported in libc. This patch replaces architecture related __ARCH_WANT_SYS_SGETMAX by expert mode configuration.That option is enabled by default for those architectures. Signed-off-by: Fabian Frederick <> Cc: Steven Miao <> Cc: Mikael Starvik <> Cc: Jesper Nilsson <> Cc: David Howells <> Cc: Geert Uytterhoeven <> Cc: Michal Simek <> Cc: Ralf Baechle <> Cc: Koichi Yasutake <> Cc: "James E.J. Bottomley" <> Cc: Helge Deller <> Cc: Benjamin Herrenschmidt <> Cc: Paul Mackerras <> Cc: "David S. Miller" <> Cc: Thomas Gleixner <> Cc: Ingo Molnar <> Cc: "H. Peter Anvin" <> Cc: Greg Ungerer <> Cc: Heiko Carstens <> Cc: Oleg Nesterov <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04mm/process_vm_access: move config option into init/KconfigKonstantin Khlebnikov1-0/+10
CONFIG_CROSS_MEMORY_ATTACH adds couple syscalls: process_vm_readv and process_vm_writev, it's a kind of IPC for copying data between processes. Currently this option is placed inside "Processor type and features". This patch moves it into "General setup" (where all other arch-independed syscalls and ipc features are placed) and changes prompt string to less cryptic. Signed-off-by: Konstantin Khlebnikov <> Cc: Christopher Yeoh <> Cc: Davidlohr Bueso <> Cc: Hugh Dickins <> Cc: Al Viro <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04memcg: kill start_kernel()->mm_init_owner(&init_mm)Oleg Nesterov1-1/+0
Remove start_kernel()->mm_init_owner(&init_mm, &init_task). This doesn't really hurt but unnecessary and misleading. init_task is the "swapper" thread == current, its ->mm is always NULL. And init_mm can only be used as ->active_mm, not as ->mm. mm_init_owner() has a single caller with this patch, perhaps it should die. mm_init() can initialize ->owner under #ifdef. Signed-off-by: Oleg Nesterov <> Reviewed-by: Michal Hocko <> Cc: Balbir Singh <> Cc: Johannes Weiner <> Cc: KAMEZAWA Hiroyuki <> Cc: Michal Hocko <> Cc: Peter Chiang <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04memcg: kill CONFIG_MM_OWNEROleg Nesterov1-7/+0
CONFIG_MM_OWNER makes no sense. It is not user-selectable, it is only selected by CONFIG_MEMCG automatically. So we can kill this option in init/Kconfig and do s/CONFIG_MM_OWNER/CONFIG_MEMCG/ globally. Signed-off-by: Oleg Nesterov <> Acked-by: Michal Hocko <> Acked-by: Johannes Weiner <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-06-04Documentation/memcg: warn about incomplete kmemcg stateVladimir Davydov1-0/+6
Kmemcg is currently under development and lacks some important features. In particular, it does not have support of kmem reclaim on memory pressure inside cgroup, which practically makes it unusable in real life. Let's warn about it in both Kconfig and Documentation to prevent complaints arising. Signed-off-by: Vladimir Davydov <> Acked-by: Michal Hocko <> Cc: Johannes Weiner <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-05-21Merge commit '7ed6fb9b5a5510e4ef78ab27419184741169978a' into x86/espfixH. Peter Anvin1-1/+1
Merge in Linus' tree with: fa81511bb0bb x86-64, modify_ldt: Make support for 16-bit segments a runtime option ... reverted, to avoid a conflict. This commit is no longer necessary with the proper fix in place. Signed-off-by: H. Peter Anvin <>
2014-05-05asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*Andi Kleen1-1/+1
As requested by Linus add explicit __visible to the asmlinkage users. This marks functions visible to assembler. Tree sweep for rest of tree. Signed-off-by: Andi Kleen <> Link: Signed-off-by: H. Peter Anvin <>
2014-05-04x86, espfix: Make espfix64 a Kconfig option, fix UMLH. Peter Anvin1-1/+1
Make espfix64 a hidden Kconfig option. This fixes the x86-64 UML build which had broken due to the non-existence of init_espfix_bsp() in UML: since UML uses its own Kconfig, this option does not appear in the UML build. This also makes it possible to make support for 16-bit segments a configuration option, for the people who want to minimize the size of the kernel. Reported-by: Ingo Molnar <> Signed-off-by: H. Peter Anvin <> Cc: Richard Weinberger <> Link:
2014-04-30x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stackH. Peter Anvin1-0/+4
The IRET instruction, when returning to a 16-bit segment, only restores the bottom 16 bits of the user space stack pointer. This causes some 16-bit software to break, but it also leaks kernel state to user space. We have a software workaround for that ("espfix") for the 32-bit kernel, but it relies on a nonzero stack segment base which is not available in 64-bit mode. In checkin: b3b42ac2cbae x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels we "solved" this by forbidding 16-bit segments on 64-bit kernels, with the logic that 16-bit support is crippled on 64-bit kernels anyway (no V86 support), but it turns out that people are doing stuff like running old Win16 binaries under Wine and expect it to work. This works around this by creating percpu "ministacks", each of which is mapped 2^16 times 64K apart. When we detect that the return SS is on the LDT, we copy the IRET frame to the ministack and use the relevant alias to return to userspace. The ministacks are mapped readonly, so if IRET faults we promote #GP to #DF which is an IST vector and thus has its own stack; we then do the fixup in the #DF handler. (Making #GP an IST exception would make the msr_safe functions unsafe in NMI/MC context, and quite possibly have other effects.) Special thanks to: - Andy Lutomirski, for the suggestion of using very small stack slots and copy (as opposed to map) the IRET frame there, and for the suggestion to mark them readonly and let the fault promote to #DF. - Konrad Wilk for paravirt fixup and testing. - Borislav Petkov for testing help and useful comments. Reported-by: Brian Gerst <> Signed-off-by: H. Peter Anvin <> Link: Cc: Konrad Rzeszutek Wilk <> Cc: Borislav Petkov <> Cc: Andrew Lutomriski <> Cc: Linus Torvalds <> Cc: Dirk Hohndel <> Cc: Arjan van de Ven <> Cc: comex <> Cc: Alexander van Heukelum <> Cc: Boris Ostrovsky <> Cc: <> # consider after upstream merge
2014-04-28param: hand arguments after -- straight to initRusty Russell1-4/+29
The kernel passes any args it doesn't need through to init, except it assumes anything containing '.' belongs to the kernel (for a module). This change means all users can clearly distinguish which arguments are for init. For example, the kernel uses debug ("dee-bug") to mean log everything to the console, where systemd uses the debug from the Scandinavian "day-boog" meaning "fail to boot". If a future versions uses argv[] instead of reading /proc/cmdline, this confusion will be avoided. eg: test 'FOO="this is --foo"' -- 'systemd.debug="true true true"' Gives: argv[0] = '/debug-init' argv[1] = 'test' argv[2] = 'systemd.debug=true true true' envp[0] = 'HOME=/' envp[1] = 'TERM=linux' envp[2] = 'FOO=this is --foo' Signed-off-by: Rusty Russell <>
2014-04-18init/Kconfig: move the trusted keyring config option to general setupPeter Foley1-12/+12
The SYSTEM_TRUSTED_KEYRING config option is not in any menu, causing it to show up in the toplevel of the kernel configuration. Fix this by moving it under the General Setup menu. Signed-off-by: Peter Foley <> Cc: David Howells <> Cc: <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-12Merge git:// Torvalds1-1/+4
Pull audit updates from Eric Paris. * git:// (28 commits) AUDIT: make audit_is_compat depend on CONFIG_AUDIT_COMPAT_GENERIC audit: renumber AUDIT_FEATURE_CHANGE into the 1300 range audit: do not cast audit_rule_data pointers pointlesly AUDIT: Allow login in non-init namespaces audit: define audit_is_compat in kernel internal header kernel: Use RCU_INIT_POINTER(x, NULL) in audit.c sched: declare pid_alive as inline audit: use uapi/linux/audit.h for AUDIT_ARCH declarations syscall_get_arch: remove useless function arguments audit: remove stray newline from audit_log_execve_info() audit_panic() call audit: remove stray newlines from audit_log_lost messages audit: include subject in login records audit: remove superfluous new- prefix in AUDIT_LOGIN messages audit: allow user processes to log from another PID namespace audit: anchor all pid references in the initial pid namespace audit: convert PPIDs to the inital PID namespace. pid: get pid_t ppid of task in init_pid_ns audit: rename the misleading audit_get_context() to audit_take_context() audit: Add generic compat syscall support audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL ...
2014-04-07initramfs: debug detected compression methodDaniel M. Weeks1-0/+1
This can greatly aid in narrowing down the real source of initramfs problems such as failures related to the compression of the in-kernel initramfs when an external initramfs is in use as well. Existing errors are ambiguous as to which initramfs is a problem and why. [ use pr_debug()] Signed-off-by: Daniel M. Weeks <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-07kconfig: make allnoconfig disable options behind EMBEDDED and EXPERTJosh Triplett1-0/+1
"make allnoconfig" exists to ease testing of minimal configurations. Documentation/SubmitChecklist includes a note to test with allnoconfig. This helps catch missing dependencies on common-but-not-required functionality, which might otherwise go unnoticed. However, allnoconfig still leaves many symbols enabled, because they're hidden behind CONFIG_EMBEDDED or CONFIG_EXPERT. For instance, allnoconfig still has CONFIG_PRINTK and CONFIG_BLOCK enabled, so drivers don't typically get build-tested with those disabled. To address this, introduce a new Kconfig option "allnoconfig_y", used on symbols which only exist to hide other symbols. Set it on CONFIG_EMBEDDED (which then selects CONFIG_EXPERT). allnoconfig will then disable all the symbols hidden behind those. Signed-off-by: Josh Triplett <> Tested-by: Paul E. McKenney <> Cc: Michal Marek <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-03Merge branch 'akpm' (incoming from Andrew)Linus Torvalds2-2/+22
Merge first patch-bomb from Andrew Morton: - Various misc bits - kmemleak fixes - small befs, codafs, cifs, efs, freexxfs, hfsplus, minixfs, reiserfs things - fanotify - I appear to have become SuperH maintainer - ocfs2 updates - direct-io tweaks - a bit of the MM queue - printk updates - MAINTAINERS maintenance - some backlight things - lib/ updates - checkpatch updates - the rtc queue - nilfs2 updates - Small Documentation/ updates * emailed patches from Andrew Morton <>: (237 commits) Documentation/SubmittingPatches: remove references to patch-scripts Documentation/SubmittingPatches: update some dead URLs Documentation/filesystems/ntfs.txt: remove changelog reference Documentation/kmemleak.txt: updates fs/reiserfs/super.c: add __init to init_inodecache fs/reiserfs: move prototype declaration to header file fs/hfsplus/attributes.c: add __init to hfsplus_create_attr_tree_cache() fs/hfsplus/extents.c: fix concurrent acess of alloc_blocks fs/hfsplus/extents.c: remove unused variable in hfsplus_get_block nilfs2: update project's web site in nilfs2.txt nilfs2: update MAINTAINERS file entries fix nilfs2: verify metadata sizes read from disk nilfs2: add FITRIM ioctl support for nilfs2 nilfs2: add nilfs_sufile_trim_fs to trim clean segs nilfs2: implementation of NILFS_IOCTL_SET_SUINFO ioctl nilfs2: add nilfs_sufile_set_suinfo to update segment usage nilfs2: add struct nilfs_suinfo_update and flags nilfs2: update MAINTAINERS file entries fs/coda/inode.c: add __init to init_inodecache() BEFS: logging cleanup ...
2014-04-03init/do_mounts.c: fix comment errorchishanmingshen1-2/+2
Signed-off-by: chishanmingshen <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-03fs, kernel: permit disabling the uselib syscallJosh Triplett1-0/+10
uselib hasn't been used since libc5; glibc does not use it. Support turning it off. When disabled, also omit the load_elf_library implementation from binfmt_elf.c, which only uselib invokes. bloat-o-meter: add/remove: 0/4 grow/shrink: 0/1 up/down: 0/-785 (-785) function old new delta padzero 39 36 -3 uselib_flags 20 - -20 sys_uselib 168 - -168 SyS_uselib 168 - -168 load_elf_library 426 - -426 The new CONFIG_USELIB defaults to `y'. Signed-off-by: Josh Triplett <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-03sys_sysfs: Add CONFIG_SYSFS_SYSCALLFabian Frederick1-0/+10
sys_sysfs is an obsolete system call no longer supported by libc. - This patch adds a default CONFIG_SYSFS_SYSCALL=y - Option can be turned off in expert mode. - cond_syscall added to kernel/sys_ni.c [ tweak Kconfig help text] Signed-off-by: Fabian Frederick <> Cc: Randy Dunlap <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-04-03Merge branch 'for-3.15' of ↵Linus Torvalds1-0/+1
git:// Pull cgroup updates from Tejun Heo: "A lot updates for cgroup: - The biggest one is cgroup's conversion to kernfs. cgroup took after the long abandoned vfs-entangled sysfs implementation and made it even more convoluted over time. cgroup's internal objects were fused with vfs objects which also brought in vfs locking and object lifetime rules. Naturally, there are places where vfs rules don't fit and nasty hacks, such as credential switching or lock dance interleaving inode mutex and cgroup_mutex with object serial number comparison thrown in to decide whether the operation is actually necessary, needed to be employed. After conversion to kernfs, internal object lifetime and locking rules are mostly isolated from vfs interactions allowing shedding of several nasty hacks and overall simplification. This will also allow implmentation of operations which may affect multiple cgroups which weren't possible before as it would have required nesting i_mutexes. - Various simplifications including dropping of module support, easier cgroup name/path handling, simplified cgroup file type handling and task_cg_lists optimization. - Prepatory changes for the planned unified hierarchy, which is still a patchset away from being actually operational. The dummy hierarchy is updated to serve as the default unified hierarchy. Controllers which aren't claimed by other hierarchies are associated with it, which BTW was what the dummy hierarchy was for anyway. - Various fixes from Li and others. This pull request includes some patches to add missing slab.h to various subsystems. This was triggered xattr.h include removal from cgroup.h. cgroup.h indirectly got included a lot of files which brought in xattr.h which brought in slab.h. There are several merge commits - one to pull in kernfs updates necessary for converting cgroup (already in upstream through driver-core), others for interfering changes in the fixes branch" * 'for-3.15' of git:// (74 commits) cgroup: remove useless argument from cgroup_exit() cgroup: fix spurious lockdep warning in cgroup_exit() cgroup: Use RCU_INIT_POINTER(x, NULL) in cgroup.c cgroup: break kernfs active_ref protection in cgroup directory operations cgroup: fix cgroup_taskset walking order cgroup: implement CFTYPE_ONLY_ON_DFL cgroup: make cgrp_dfl_root mountable cgroup: drop const from @buffer of cftype->write_string() cgroup: rename cgroup_dummy_root and related names cgroup: move ->subsys_mask from cgroupfs_root to cgroup cgroup: treat cgroup_dummy_root as an equivalent hierarchy during rebinding cgroup: remove NULL checks from [pr_cont_]cgroup_{name|path}() cgroup: use cgroup_setup_root() to initialize cgroup_dummy_root cgroup: reorganize cgroup bootstrapping cgroup: relocate setting of CGRP_DEAD cpuset: use rcu_read_lock() to protect task_cs() cgroup_freezer: document freezer_fork() subtleties cgroup: update cgroup_transfer_tasks() to either succeed or fail cgroup: drop task_lock() protection around task->cgroups cgroup: update how a newly forked task gets associated with css_set ...
2014-03-31Merge branch 'core-locking-for-linus' of ↵Linus Torvalds1-0/+7
git:// Pull core locking updates from Ingo Molnar: "The biggest change is the MCS spinlock generalization changes from Tim Chen, Peter Zijlstra, Jason Low et al. There's also lockdep fixes/enhancements from Oleg Nesterov, in particular a false negative fix related to lockdep_set_novalidate_class() usage" * 'core-locking-for-linus' of git:// (22 commits) locking/mutex: Fix debug checks locking/mutexes: Add extra reschedule point locking/mutexes: Introduce cancelable MCS lock for adaptive spinning locking/mutexes: Unlock the mutex without the wait_lock locking/mutexes: Modify the way optimistic spinners are queued locking/mutexes: Return false if task need_resched() in mutex_can_spin_on_owner() locking: Move mcs_spinlock.h into kernel/locking/ m68k: Skip futex_atomic_cmpxchg_inatomic() test futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() test Revert "sched/wait: Suppress Sparse 'variable shadowing' warning" lockdep: Change lockdep_set_novalidate_class() to use _and_name lockdep: Change mark_held_locks() to check hlock->check instead of lockdep_no_validate lockdep: Don't create the wrong dependency on hlock->check == 0 lockdep: Make held_lock->check and "int check" argument bool locking/mcs: Allow architecture specific asm files to be used for contended case locking/mcs: Order the header files in Kbuild of each architecture in alphabetical order sched/wait: Suppress Sparse 'variable shadowing' warning hung_task/Documentation: Fix hung_task_warnings description locking/mcs: Allow architectures to hook in to contended paths locking/mcs: Micro-optimize the MCS code, add extra comments ...
2014-03-20audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALLAKASHI Takahiro1-1/+4
Currently AUDITSYSCALL has a long list of architecture depencency: depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ALPHA) The purpose of this patch is to replace it with HAVE_ARCH_AUDITSYSCALL for simplicity. Signed-off-by: AKASHI Takahiro <> Acked-by: Will Deacon <> (arm) Acked-by: Richard Guy Briggs <> (audit) Acked-by: Matt Turner <> (alpha) Acked-by: Michael Ellerman <> (powerpc) Signed-off-by: Eric Paris <>
2014-03-20alpha: Enable system-call auditing support.蔡正龙1-1/+1
Signed-off-by: Zhenglong.cai <> Signed-off-by: Matt Turner <>
2014-03-13ACPI / init: Invoke early ACPI initialization laterRafael J. Wysocki1-1/+1
Commit 73f7d1ca3263 (ACPI / init: Run acpi_early_init() before timekeeping_init()) optimistically moved the early ACPI initialization before timekeeping_init(), but that didn't work, because it broke fast TSC calibration for Julian Wollrath on Thinkpad x121e (and most likely for others too). The reason is that acpi_early_init() enables the SCI and that interferes with the fast TSC calibration mechanism. Thus follow the original idea to execute acpi_early_init() before efi_enter_virtual_mode() to help the EFI people for now and we can revisit the other problem that commit 73f7d1ca3263 attempted to address in the future (if really necessary). Fixes: 73f7d1ca3263 (ACPI / init: Run acpi_early_init() before timekeeping_init()) Reported-by: Julian Wollrath <> Reviewed-by: Thomas Gleixner <> Signed-off-by: Rafael J. Wysocki <>
2014-03-03futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() testHeiko Carstens1-0/+7
If an architecture has futex_atomic_cmpxchg_inatomic() implemented and there is no runtime check necessary, allow to skip the test within futex_init(). This allows to get rid of some code which would always give the same result, and also allows the compiler to optimize a couple of if statements away. Signed-off-by: Heiko Carstens <> Cc: Finn Thain <> Cc: Geert Uytterhoeven <> Link: Signed-off-by: Thomas Gleixner <>
2014-02-11cgroup: convert to kernfsTejun Heo1-0/+1
cgroup filesystem code was derived from the original sysfs implementation which was heavily intertwined with vfs objects and locking with the goal of re-using the existing vfs infrastructure. That experiment turned out rather disastrous and sysfs switched, a long time ago, to distributed filesystem model where a separate representation is maintained which is queried by vfs. Unfortunately, cgroup stuck with the failed experiment all these years and accumulated even more problems over time. Locking and object lifetime management being entangled with vfs is probably the most egregious. vfs is never designed to be misused like this and cgroup ends up jumping through various convoluted dancing to make things work. Even then, operations across multiple cgroups can't be done safely as it'll deadlock with rename locking. Recently, kernfs is separated out from sysfs so that it can be used by users other than sysfs. This patch converts cgroup to use kernfs, which will bring the following benefits. * Separation from vfs internals. Locking and object lifetime management is contained in cgroup proper making things a lot simpler. This removes significant amount of locking convolutions, hairy object lifetime rules and the restriction on multi-cgroup operations. * Can drop a lot of code to implement filesystem interface as most are provided by kernfs. * Proper "severing" semantics, which allows controllers to not worry about lingering file accesses after offline. While the preceding patches did as much as possible to make the transition less painful, large part of the conversion has to be one discrete step making this patch rather large. The rest of the commit message lists notable changes in different areas. Overall ------- * vfs constructs replaced with kernfs ones. cgroup->dentry w/ ->kn, cgroupfs_root->sb w/ ->kf_root. * All dentry accessors are removed. Helpers to map from kernfs constructs are added. * All vfs plumbing around dentry, inode and bdi removed. * cgroup_mount() now directly looks for matching root and then proceeds to create a new one if not found. Synchronization and object lifetime ----------------------------------- * vfs inode locking removed. Among other things, this removes the need for the convolution in cgroup_cfts_commit(). Future patches will further simplify it. * vfs refcnting replaced with cgroup internal ones. cgroup->refcnt, cgroupfs_root->refcnt added. cgroup_put_root() now directly puts root->refcnt and when it reaches zero proceeds to destroy it thus merging cgroup_put_root() and the former cgroup_kill_sb(). Simliarly, cgroup_put() now directly schedules cgroup_free_rcu() when refcnt reaches zero. * Unlike before, kernfs objects don't hold onto cgroup objects. When cgroup destroys a kernfs node, all existing operations are drained and the association is broken immediately. The same for cgroupfs_roots and mounts. * All operations which come through kernfs guarantee that the associated cgroup is and stays valid for the duration of operation; however, there are two paths which need to find out the associated cgroup from dentry without going through kernfs - css_tryget_from_dir() and cgroupstats_build(). For these two, kernfs_node->priv is RCU managed so that they can dereference it under RCU read lock. File and directory handling --------------------------- * File and directory operations converted to kernfs_ops and kernfs_syscall_ops. * xattrs is implicitly supported by kernfs. No need to worry about it from cgroup. This means that "xattr" mount option is no longer necessary. A future patch will add a deprecated warning message when sane_behavior. * When cftype->max_write_len > PAGE_SIZE, it's necessary to make a private copy of one of the kernfs_ops to set its atomic_write_len. cftype->kf_ops is added and cgroup_init/exit_cftypes() are updated to handle it. * cftype->lockdep_key added so that kernfs lockdep annotation can be per cftype. * Inidividual file entries and open states are now managed by kernfs. No need to worry about them from cgroup. cfent, cgroup_open_file and their friends are removed. * kernfs_nodes are created deactivated and kernfs_activate() invocations added to places where creation of new nodes are committed. * cgroup_rmdir() uses kernfs_[un]break_active_protection() for self-removal. v2: - Li pointed out in an earlier patch that specifying "name=" during mount without subsystem specification should succeed if there's an existing hierarchy with a matching name although it should fail with -EINVAL if a new hierarchy should be created. Prior to the conversion, this used by handled by deferring failure from NULL return from cgroup_root_from_opts(), which was necessary because root was being created before checking for existing ones. Note that cgroup_root_from_opts() returned an ERR_PTR() value for error conditions which require immediate mount failure. As we now have separate search and creation steps, deferring failure from cgroup_root_from_opts() is no longer necessary. cgroup_root_from_opts() is updated to always return ERR_PTR() value on failure. - The logic to match existing roots is updated so that a mount attempt with a matching name but different subsys_mask are rejected. This was handled by a separate matching loop under the comment "Check for name clashes with existing mounts" but got lost during conversion. Merge the check into the main search loop. - Add __rcu __force casting in RCU_INIT_POINTER() in cgroup_destroy_locked() to avoid the sparse address space warning reported by kbuild test bot. Maybe we want an explicit interface to use kn->priv as RCU protected pointer? v3: Make CONFIG_CGROUPS select CONFIG_KERNFS. v4: Rebased on top of 0ab02ca8f887 ("cgroup: protect modifications to cgroup_idr with cgroup_mutex"). Signed-off-by: Tejun Heo <> Acked-by: Li Zefan <> Cc: kbuild test robot>
2014-02-05execve: use 'struct filename *' for executable name passingLinus Torvalds1-1/+1
This changes 'do_execve()' to get the executable name as a 'struct filename', and to free it when it is done. This is what the normal users want, and it simplifies and streamlines their error handling. The controlled lifetime of the executable name also fixes a use-after-free problem with the trace_sched_process_exec tracepoint: the lifetime of the passed-in string for kernel users was not at all obvious, and the user-mode helper code used UMH_WAIT_EXEC to serialize the pathname allocation lifetime with the execve() having finished, which in turn meant that the trace point that happened after mm_release() of the old process VM ended up using already free'd memory. To solve the kernel string lifetime issue, this simply introduces "getname_kernel()" that works like the normal user-space getname() function, except with the source coming from kernel memory. As Oleg points out, this also means that we could drop the tcomm[] array from 'struct linux_binprm', since the pathname lifetime now covers setup_new_exec(). That would be a separate cleanup. Reported-by: Igor Zhbanov <> Tested-by: Steven Rostedt <> Cc: Oleg Nesterov <> Cc: Al Viro <> Signed-off-by: Linus Torvalds <>
2014-01-31alpha: Enable system-call auditing support.蔡正龙1-1/+1
Signed-off-by: Zhenglong.cai <> Signed-off-by: Matt Turner <>
2014-01-28Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git:// Pull vfs updates from Al Viro: "Assorted stuff; the biggest pile here is Christoph's ACL series. Plus assorted cleanups and fixes all over the place... There will be another pile later this week" * 'for-linus' of git:// (43 commits) __dentry_path() fixes vfs: Remove second variable named error in __dentry_path vfs: Is mounted should be testing mnt_ns for NULL or error. Fix race when checking i_size on direct i/o read hfsplus: remove can_set_xattr nfsd: use get_acl and ->set_acl fs: remove generic_acl nfs: use generic posix ACL infrastructure for v3 Posix ACLs gfs2: use generic posix ACL infrastructure jfs: use generic posix ACL infrastructure xfs: use generic posix ACL infrastructure reiserfs: use generic posix ACL infrastructure ocfs2: use generic posix ACL infrastructure jffs2: use generic posix ACL infrastructure hfsplus: use generic posix ACL infrastructure f2fs: use generic posix ACL infrastructure ext2/3/4: use generic posix ACL infrastructure btrfs: use generic posix ACL infrastructure fs: make posix_acl_create more useful fs: make posix_acl_chmod more useful ...
2014-01-27init/main.c: remove unused declaractions of mca_init() and sbus_init()Kang Hu1-2/+0
mca_init() no longer exists. sbus_init() is defined in arch/sparc/kernel/sbus.c and is a subsys_initcall. both are not needed in main.c any more. Signed-off-by: Kang Hu <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-01-25Merge branch 'for-linus' of ↵Linus Torvalds1-11/+0
git:// Pull user namespaces work from Eric Biederman: "The work to convert the kernel to use kuid_t and kgid_t has been finished since 3.12 so it is time to remove the scaffolding that allowed the work to progress incrementally. The first patch on this branch just removes the scaffolding, ensuring we will always get compile errors if people accidentally try the userspace and the kernel uid and gid types. The second patch an overlooked and unused chunk of mips code that that fails to build after the first patch. The code hasn't been in linux-next for long (as I was out of it and could not sheppared the cold properly) but the patch has been around for a long time just waiting for the day when I had finished the uid/gid conversions. Putting the code in linux-next did find the compile failure on mips so I took the time to get that fix reviewed and included. Beyond that I am not too worried about errors because all these two patches do is delete a modest amount of code" * 'for-linus' of git:// MIPS: VPE: Remove vpe_getuid and vpe_getgid userns: userns: Remove UIDGID_STRICT_TYPE_CHECKS
2014-01-25cramfs: take headers to fs/cramfsAl Viro1-1/+1
Signed-off-by: Al Viro <>
2014-01-24Merge tag 'pm+acpi-3.14-rc1' of ↵Linus Torvalds1-1/+1
git:// Pull ACPI and power management updates from Rafael Wysocki: "As far as the number of commits goes, the top spot belongs to ACPI this time with cpufreq in the second position and a handful of PM core, PNP and cpuidle updates. They are fixes and cleanups mostly, as usual, with a couple of new features in the mix. The most visible change is probably that we will create struct acpi_device objects (visible in sysfs) for all devices represented in the ACPI tables regardless of their status and there will be a new sysfs attribute under those objects allowing user space to check that status via _STA. Consequently, ACPI device eject or generally hot-removal will not delete those objects, unless the table containing the corresponding namespace nodes is unloaded, which is extremely rare. Also ACPI container hotplug will be handled quite a bit differently and cpufreq will support CPU boost ("turbo") generically and not only in the acpi-cpufreq driver. Specifics: - ACPI core changes to make it create a struct acpi_device object for every device represented in the ACPI tables during all namespace scans regardless of the current status of that device. In accordance with this, ACPI hotplug operations will not delete those objects, unless the underlying ACPI tables go away. - On top of the above, new sysfs attribute for ACPI device objects allowing user space to check device status by triggering the execution of _STA for its ACPI object. From Srinivas Pandruvada. - ACPI core hotplug changes reducing code duplication, integrating the PCI root hotplug with the core and reworking container hotplug. - ACPI core simplifications making it use ACPI_COMPANION() in the code "glueing" ACPI device objects to "physical" devices. - ACPICA update to upstream version 20131218. This adds support for the DBG2 and PCCT tables to ACPICA, fixes some bugs and improves debug facilities. From Bob Moore, Lv Zheng and Betty Dall. - Init code change to carry out the early ACPI initialization earlier. That should allow us to use ACPI during the timekeeping initialization and possibly to simplify the EFI initialization too. From Chun-Yi Lee. - Clenups of the inclusions of ACPI headers in many places all over from Lv Zheng and Rashika Kheria (work in progress). - New helper for ACPI _DSM execution and rework of the code in drivers that uses _DSM to execute it via the new helper. From Jiang Liu. - New Win8 OSI blacklist entries from Takashi Iwai. - Assorted ACPI fixes and cleanups from Al Stone, Emil Goode, Hanjun Guo, Lan Tianyu, Masanari Iida, Oliver Neukum, Prarit Bhargava, Rashika Kheria, Tang Chen, Zhang Rui. - intel_pstate driver updates, including proper Baytrail support, from Dirk Brandewie and intel_pstate documentation from Ramkumar Ramachandra. - Generic CPU boost ("turbo") support for cpufreq from Lukasz Majewski. - powernow-k6 cpufreq driver fixes from Mikulas Patocka. - cpufreq core fixes and cleanups from Viresh Kumar, Jane Li, Mark Brown. - Assorted cpufreq drivers fixes and cleanups from Anson Huang, John Tobias, Paul Bolle, Paul Walmsley, Sachin Kamat, Shawn Guo, Viresh Kumar. - cpuidle cleanups from Bartlomiej Zolnierkiewicz. - Support for hibernation APM events from Bin Shi. - Hibernation fix to avoid bringing up nonboot CPUs with ACPI EC disabled during thaw transitions from Bjørn Mork. - PM core fixes and cleanups from Ben Dooks, Leonardo Potenza, Ulf Hansson. - PNP subsystem fixes and cleanups from Dmitry Torokhov, Levente Kurusa, Rashika Kheria. - New tool for profiling system suspend from Todd E Brandt and a cpupower tool cleanup from One Thousand Gnomes" * tag 'pm+acpi-3.14-rc1' of git:// (153 commits) thermal: exynos: boost: Automatic enable/disable of BOOST feature (at Exynos4412) cpufreq: exynos4x12: Change L0 driver data to CPUFREQ_BOOST_FREQ Documentation: cpufreq / boost: Update BOOST documentation cpufreq: exynos: Extend Exynos cpufreq driver to support boost cpufreq / boost: Kconfig: Support for software-managed BOOST acpi-cpufreq: Adjust the code to use the common boost attribute cpufreq: Add boost frequency support in core intel_pstate: Add trace point to report internal state. cpufreq: introduce cpufreq_generic_get() routine ARM: SA1100: Create dummy clk_get_rate() to avoid build failures cpufreq: stats: create sysfs entries when cpufreq_stats is a module cpufreq: stats: free table and remove sysfs entry in a single routine cpufreq: stats: remove hotplug notifiers cpufreq: stats: handle cpufreq_unregister_driver() and suspend/resume properly cpufreq: speedstep: remove unused speedstep_get_state platform: introduce OF style 'modalias' support for platform bus PM / tools: new tool for suspend/resume performance optimization ACPI: fix module autoloading for ACPI enumerated devices ACPI: add module autoloading support for ACPI enumerated devices ACPI: fix create_modalias() return value handling ...
2014-01-23init: fix possible format string bugTetsuo Handa2-4/+5
Use constant format string in case message changes. Signed-off-by: Tetsuo Handa <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-01-23init/main.c: remove unused declaration of tc_init()Geert Uytterhoeven1-4/+0
Its user was removed in v2.5.2.4. Signed-off-by: Geert Uytterhoeven <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-01-21Merge branch 'akpm' (incoming from Andrew)Linus Torvalds1-4/+6
Merge first patch-bomb from Andrew Morton: - a couple of misc things - inotify/fsnotify work from Jan - ocfs2 updates (partial) - about half of MM * emailed patches from Andrew Morton <>: (117 commits) mm/migrate: remove unused function, fail_migrate_page() mm/migrate: remove putback_lru_pages, fix comment on putback_movable_pages mm/migrate: correct failure handling if !hugepage_migration_support() mm/migrate: add comment about permanent failure path mm, page_alloc: warn for non-blockable __GFP_NOFAIL allocation failure mm: compaction: reset scanner positions immediately when they meet mm: compaction: do not mark unmovable pageblocks as skipped in async compaction mm: compaction: detect when scanners meet in isolate_freepages mm: compaction: reset cached scanner pfn's before reading them mm: compaction: encapsulate defer reset logic mm: compaction: trace compaction begin and end memcg, oom: lock mem_cgroup_print_oom_info sched: add tracepoints related to NUMA task migration mm: numa: do not automatically migrate KSM pages mm: numa: trace tasks that fail migration due to rate limiting mm: numa: limit scope of lock for NUMA migrate rate limiting mm: numa: make NUMA-migrate related functions static lib/show_mem.c: show num_poisoned_pages when oom mm/hwpoison: add '#' to hwpoison_inject mm/memblock: use WARN_ONCE when MAX_NUMNODES passed as input parameter ...
2014-01-21Merge branch 'for-3.14' of ↵Linus Torvalds1-2/+1
git:// Pull cgroup updates from Tejun Heo: "The bulk of changes are cleanups and preparations for the upcoming kernfs conversion. - cgroup_event mechanism which is and will be used only by memcg is moved to memcg. - pidlist handling is updated so that it can be served by seq_file. Also, the list is not sorted if sane_behavior. cgroup documentation explicitly states that the file is not sorted but it has been for quite some time. - All cgroup file handling now happens on top of seq_file. This is to prepare for kernfs conversion. In addition, all operations are restructured so that they map 1-1 to kernfs operations. - Other cleanups and low-pri fixes" * 'for-3.14' of git:// (40 commits) cgroup: trivial style updates cgroup: remove stray references to css_id doc: cgroups: Fix typo in doc/cgroups cgroup: fix fail path in cgroup_load_subsys() cgroup: fix missing unlock on error in cgroup_load_subsys() cgroup: remove for_each_root_subsys() cgroup: implement for_each_css() cgroup: factor out cgroup_subsys_state creation into create_css() cgroup: combine css handling loops in cgroup_create() cgroup: reorder operations in cgroup_create() cgroup: make for_each_subsys() useable under cgroup_root_mutex cgroup: css iterations and css_from_dir() are safe under cgroup_mutex cgroup: unify pidlist and other file handling cgroup: replace cftype->read_seq_string() with cftype->seq_show() cgroup: attach cgroup_open_file to all cgroup files cgroup: generalize cgroup_pidlist_open_file cgroup: unify read path so that seq_file is always used cgroup: unify cgroup_write_X64() and cgroup_write_string() cgroup: remove cftype->read(), ->read_map() and ->write() hugetlb_cgroup: convert away from cftype->read() ...
2014-01-21init/main.c: use memblock apis for early memory allocationsSantosh Shilimkar1-3/+5
Switch to memblock interfaces for early memory allocator instead of bootmem allocator. No functional change in beahvior than what it is in current code from bootmem users points of view. Archs already converted to NO_BOOTMEM now directly use memblock interfaces instead of bootmem wrappers build on top of memblock. And the archs which still uses bootmem, these new apis just fall back to exiting bootmem APIs. Signed-off-by: Santosh Shilimkar <> Cc: Yinghai Lu <> Cc: Tejun Heo <> Cc: "Rafael J. Wysocki" <> Cc: Arnd Bergmann <> Cc: Christoph Lameter <> Cc: Greg Kroah-Hartman <> Cc: Grygorii Strashko <> Cc: H. Peter Anvin <> Cc: Johannes Weiner <> Cc: KAMEZAWA Hiroyuki <> Cc: Konrad Rzeszutek Wilk <> Cc: Michal Hocko <> Cc: Paul Walmsley <> Cc: Pavel Machek <> Cc: Russell King <> Cc: Tony Lindgren <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-01-21mm: create a separate slab for page->ptl allocationKirill A. Shutemov1-1/+1
If DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC are enabled spinlock_t on x86_64 is 72 bytes. For page->ptl they will be allocated from kmalloc-96 slab, so we loose 24 on each. An average system can easily allocate few tens thousands of page->ptl and overhead is significant. Let's create a separate slab for page->ptl allocation to solve this. To make sure that it really works this time, some numbers from my test machine (just booted, no load): Before: # grep '^\(kmalloc-96\|page->ptl\)' /proc/slabinfo kmalloc-96 31987 32190 128 30 1 : tunables 120 60 8 : slabdata 1073 1073 92 After: # grep '^\(kmalloc-96\|page->ptl\)' /proc/slabinfo page->ptl 27516 28143 72 53 1 : tunables 120 60 8 : slabdata 531 531 9 kmalloc-96 3853 5280 128 30 1 : tunables 120 60 8 : slabdata 176 176 0 Note that the patch is useful not only for debug case, but also for PREEMPT_RT, where spinlock_t is always bloated. Signed-off-by: Kirill A. Shutemov <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2014-01-16ACPI / init: Run acpi_early_init() before timekeeping_init()Lee, Chun-Yi1-1/+1
This is a variant patch from Rafael J. Wysocki's ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode() According to Matt Fleming, if acpi_early_init() was executed before efi_enter_virtual_mode(), the EFI initialization could benefit from it, so Rafael's patch makes that happen. And, we want accessing ACPI TAD device to set system clock, so move acpi_early_init() before timekeeping_init(). This final position is also before efi_enter_virtual_mode(). Tested-by: Toshi Kani <> Signed-off-by: Lee, Chun-Yi <> Signed-off-by: Rafael J. Wysocki <>
2014-01-12Merge branch 'linus' into timers/coreIngo Molnar1-0/+6
Pick up the latest fixes and refresh the branch. Signed-off-by: Ingo Molnar <>
2013-12-11math64: Add mul_u64_u32_shr()Peter Zijlstra1-0/+6
Introduce mul_u64_u32_shr() as proposed by Andy a while back; it allows using 64x64->128 muls on 64bit archs and recent GCC which defines __SIZEOF_INT128__ and __int128. (This new method will be used by the scheduler.) Signed-off-by: Peter Zijlstra <> Cc: Cc: Andy Lutomirski <> Cc: Linus Torvalds <> Link: Signed-off-by: Ingo Molnar <>
2013-12-02trivial: fix spelling in CONTEXT_TRACKING_FORCE help textPaul Gortmaker1-1/+1
Signed-off-by: Paul Gortmaker <> Signed-off-by: Frederic Weisbecker <> Cc: Thomas Gleixner <> Cc: Ingo Molnar <> Cc: Peter Zijlstra <> Cc: Oleg Nesterov <> Cc: Steven Rostedt <>
2013-11-26userns: userns: Remove UIDGID_STRICT_TYPE_CHECKSEric W. Biederman1-11/+0
Removing UIDGID_STRICT_TYPE_CHECKS simplifies the code and always generates a compile error if the uids and kuids or gids and kgids are mixed by accident. Now that the appropriate conversions have been placed throughout the kernel there is no longer a need for a mode where we don't detect them as compile errors. Acked-by: Serge Hallyn <> Signed-off-by: Eric W. Biederman <>