mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-04-02 06:39:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: Introduce bpf_ksym_exists() macro.

Browse Source 
Introduce bpf_ksym_exists() macro that can be used by BPF programs
to detect at load time whether particular ksym (either variable or kfunc)
is present in the kernel.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230317201920.62030-4-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov
2023-03-17 13:19:19 -07:00
committed by Andrii Nakryiko
parent fd28ca4b5b
commit c401b96718
1 changed files with 5 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/bpf_helpers.h
View File

@@ -177,6 +177,11 @@ enum libbpf_tristate {
#define __kptr_untrusted __attribute__((btf_type_tag("kptr_untrusted"))) #define __kptr_untrusted __attribute__((btf_type_tag("kptr_untrusted")))
#define __kptr __attribute__((btf_type_tag("kptr"))) #define __kptr __attribute__((btf_type_tag("kptr")))
#define bpf_ksym_exists(sym) ({ \
_Static_assert(!__builtin_constant_p(!!sym), #sym " should be marked as __weak"); \
!!sym; \
})
#ifndef ___bpf_concat #ifndef ___bpf_concat
#define ___bpf_concat(a, b) a ## b #define ___bpf_concat(a, b) a ## b
#endif #endif