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| author | Masahiro Yamada <masahiroy@kernel.org> | 2023-06-11 18:50:54 +0300 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-06-22 15:21:06 +0300 |
| commit | 6d62b1c46b1e6e1686a0cf6617c96c80d4ab5cd5 (patch) | |
| tree | cd7844f90eb2d83679f0d1f31fbe556c8b1ed856 /scripts/Makefile.build | |
| parent | 7d59313f19df0b55db6b31c5e4d4e828aa77d584 (diff) | |
| download | linux-6d62b1c46b1e6e1686a0cf6617c96c80d4ab5cd5.tar.xz | |
modpost: check static EXPORT_SYMBOL* by modpost again
Commit 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script
instead of modpost") moved the static EXPORT_SYMBOL* check from the
mostpost to a shell script because I thought it must be checked per
compilation unit to avoid false negatives.
I came up with an idea to do this in modpost, against combined ELF
files. The relocation entries in ELF will find the correct exported
symbol even if there exist symbols with the same name in different
compilation units.
Again, the same sample code.
Makefile:
obj-y += foo1.o foo2.o
foo1.c:
#include <linux/export.h>
static void foo(void) {}
EXPORT_SYMBOL(foo);
foo2.c:
void foo(void) {}
Then, modpost can catch it correctly.
MODPOST Module.symvers
ERROR: modpost: vmlinux: local symbol 'foo' was exported
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 4119e737fe87..210142c3ff00 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -222,8 +222,6 @@ cmd_gen_ksymdeps = \ $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd endif -cmd_check_local_export = $(srctree)/scripts/check-local-export $@ - ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi))) endif @@ -231,7 +229,6 @@ endif define rule_cc_o_c $(call cmd_and_fixdep,cc_o_c) $(call cmd,gen_ksymdeps) - $(call cmd,check_local_export) $(call cmd,checksrc) $(call cmd,checkdoc) $(call cmd,gen_objtooldep) @@ -243,7 +240,6 @@ endef define rule_as_o_S $(call cmd_and_fixdep,as_o_S) $(call cmd,gen_ksymdeps) - $(call cmd,check_local_export) $(call cmd,gen_objtooldep) $(call cmd,gen_symversions_S) $(call cmd,warn_shared_object) |