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libbpf: Avoid inline hint definition from 'linux/stddef.h'

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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
This commit is contained in:
Pedro Tammela 2021-03-14 18:38:38 +01:00 committed by Andrii Nakryiko
parent 6503b9f29a
commit 0205e9de42
1 changed files with 3 additions and 2 deletions
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5
tools/lib/bpf/bpf_helpers.h
View File

@ -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