From: Pedro Tammela pctammela@gmail.com
mainline inclusion from mainline-5.13-rc1 commit 0205e9de42911404902728911b03fc1469242419 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Linux headers might pull 'linux/stddef.h' which defines '__always_inline' as the following:
#ifndef __always_inline #define __always_inline inline #endif
This becomes an issue if the program picks up the 'linux/stddef.h' definition as the macro now just hints inline to clang.
This change now enforces the proper definition for BPF programs regardless of the include order.
Signed-off-by: Pedro Tammela pctammela@gmail.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/20210314173839.457768-1-pctammela@gmail.com (cherry picked from commit 0205e9de42911404902728911b03fc1469242419) Signed-off-by: Wang Yufen wangyufen@huawei.com --- tools/lib/bpf/bpf_helpers.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index ae6c975e0b87..53ff81c49dbd 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -29,9 +29,10 @@ */ #define SEC(NAME) __attribute__((section(NAME), used))
-#ifndef __always_inline +/* Avoid 'linux/stddef.h' definition of '__always_inline'. */ +#undef __always_inline #define __always_inline inline __attribute__((always_inline)) -#endif + #ifndef __noinline #define __noinline __attribute__((noinline)) #endif