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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2016-12-02 15:11:50 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-02 14:46:42 -0800 |
| commit | 865563924022d8a307ee6dbc6a9ab4fb4d461cce (patch) | |
| tree | a0e678342d63d30860f81776d4ebe50e6ac51500 /Makefile | |
| parent | 8dc0f265d39a3933f4c1f846c7c694f12a2ab88a (diff) | |
| download | linux-865563924022d8a307ee6dbc6a9ab4fb4d461cce.tar.gz linux-865563924022d8a307ee6dbc6a9ab4fb4d461cce.tar.bz2 linux-865563924022d8a307ee6dbc6a9ab4fb4d461cce.zip | |
kbuild: fix building bzImage with CONFIG_TRIM_UNUSED_KSYMS enabled
When building a specific target such as bzImage, modules aren't normally
built. However if CONFIG_TRIM_UNUSED_KSYMS is enabled, no built modules
means none of the exported symbols are used and therefore they will all
be trimmed away from the final kernel. A subsequent "make modules" will
fail because modpost cannot find the needed symbols for those modules in
the kernel binary.
Let's make sure modules are also built whenever CONFIG_TRIM_UNUSED_KSYMS
is enabled and that the kernel binary is properly rebuilt accordingly.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 9 |
1 files changed, 8 insertions, 1 deletions
@@ -607,6 +607,13 @@ else include/config/auto.conf: ; endif # $(dot-config) +# For the kernel to actually contain only the needed exported symbols, +# we have to build modules as well to determine what those symbols are. +# (this can be evaluated only once include/config/auto.conf has been included) +ifdef CONFIG_TRIM_UNUSED_KSYMS + KBUILD_MODULES := 1 +endif + # The all: target is the default when no target is given on the # command line. # This allow a user to issue only 'make' to build a kernel including modules @@ -944,7 +951,7 @@ ifdef CONFIG_GDB_SCRIPTS endif ifdef CONFIG_TRIM_UNUSED_KSYMS $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ - "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq" + "$(MAKE) -f $(srctree)/Makefile vmlinux" endif # standalone target for easier testing |