Commit 0205e9de authored by Pedro Tammela's avatar Pedro Tammela Committed by Andrii Nakryiko
Browse files

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



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: default avatarPedro Tammela <pctammela@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210314173839.457768-1-pctammela@gmail.com
parent 6503b9f2

tools/lib/bpf/bpf_helpers.h

+3 −2
Original line number Diff line number Diff line
@@ -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