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authorMax Filippov <jcmvbkbc@gmail.com>2013-05-15 19:34:05 +0400
committerChris Zankel <chris@zankel.net>2013-07-08 01:18:56 -0700
commita99e07ee5e887750f5136bc6799abe47a56fd2c9 (patch)
tree9464580bafe4ff135db21a6fb2a5165445d7bdaf /arch/xtensa/Kconfig.debug
parentc5a771d0678f9613e9f89cf1a5bdcfa5b08b225b (diff)
downloadlinux-a99e07ee5e887750f5136bc6799abe47a56fd2c9.tar.gz
xtensa: check TLB sanity on return to userspace
- check that user TLB mappings correspond to the current page table; - check that TLB mapping VPN is in the kernel/user address range in accordance with its ASID. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/Kconfig.debug')
-rw-r--r--arch/xtensa/Kconfig.debug10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig.debug b/arch/xtensa/Kconfig.debug
index a34010e0e51c..af7da74d535f 100644
--- a/arch/xtensa/Kconfig.debug
+++ b/arch/xtensa/Kconfig.debug
@@ -2,6 +2,16 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
+config DEBUG_TLB_SANITY
+ bool "Debug TLB sanity"
+ depends on DEBUG_KERNEL
+ help
+ Enable this to turn on TLB sanity check on each entry to userspace.
+ This check can spot missing TLB invalidation/wrong PTE permissions/
+ premature page freeing.
+
+ If unsure, say N.
+
config LD_NO_RELAX
bool "Disable linker relaxation"
default n