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authorNicolas Pitre <nicolas.pitre@linaro.org>2016-01-26 21:50:18 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2016-03-29 16:30:57 -0400
commit23121ca2b56b583c43512e4d7a926343be937714 (patch)
tree19b0d865046cd3163046aa52124947c0e89d1c2f /Makefile
parentc1a95fda2a40ae8c7aad3fa44fa7718a3710eb2d (diff)
downloadlinux-23121ca2b56b583c43512e4d7a926343be937714.tar.gz
kbuild: create/adjust generated/autoksyms.h
Given the list of exported symbols needed by all modules, we can create a header file containing preprocessor defines for each of those symbols. Also, when some symbols are added and/or removed from the list, we can update the time on the corresponding files used as build dependencies for those symbols. And finally, if any symbol did change state, the corresponding source files must be rebuilt. The insertion or removal of an EXPORT_SYMBOL() entry within a module may create or remove the need for another exported symbol. This is why this operation has to be repeated until the list of needed exported symbols becomes stable. Only then the final kernel and modules link take place. Signed-off-by: Nicolas Pitre <nico@linaro.org> Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile13
1 files changed, 13 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 451acbebee97..9f93d2595d25 100644
--- a/Makefile
+++ b/Makefile
@@ -933,6 +933,10 @@ quiet_cmd_link-vmlinux = LINK $@
# Include targets which we want to
# execute if the rest of the kernel build went well.
vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
+ifdef CONFIG_TRIM_UNUSED_KSYMS
+ $(Q)$(CONFIG_SHELL) scripts/adjust_autoksyms.sh \
+ "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile autoksyms_recursive"
+endif
ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
@@ -947,6 +951,15 @@ ifdef CONFIG_GDB_SCRIPTS
endif
+$(call if_changed,link-vmlinux)
+autoksyms_recursive: $(vmlinux-deps)
+ $(Q)$(CONFIG_SHELL) scripts/adjust_autoksyms.sh \
+ "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile autoksyms_recursive"
+PHONY += autoksyms_recursive
+
+# standalone target for easier testing
+include/generated/autoksyms.h: FORCE
+ $(Q)$(CONFIG_SHELL) scripts/adjust_autoksyms.sh true
+
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;