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bpf: btf: Add BTF_KFUNCS_START/END macro pair

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This macro pair is functionally equivalent to BTF_SET8_START/END, except
with BTF_SET8_KFUNCS flag set in the btf_id_set8 flags field. The next
commit will codemod all kfunc set8s to this new variant such that all
kfuncs are tagged as such in .BTF_ids section.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/d536c57c7c2af428686853cc7396b7a44faa53b7.1706491398.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Xu 2024-01-28 18:24:07 -07:00 committed by Alexei Starovoitov
parent 79b47344bb
commit a05e90427e
1 changed files with 11 additions and 0 deletions
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11
include/linux/btf_ids.h
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@ -8,6 +8,9 @@ struct btf_id_set {
u32 ids[];
};
/* This flag implies BTF_SET8 holds kfunc(s) */
#define BTF_SET8_KFUNCS (1 << 0)
struct btf_id_set8 {
u32 cnt;
u32 flags;
@ -204,6 +207,12 @@ asm( \
".popsection; \n"); \
extern struct btf_id_set8 name;
#define BTF_KFUNCS_START(name) \
__BTF_SET8_START(name, local, BTF_SET8_KFUNCS)
#define BTF_KFUNCS_END(name) \
BTF_SET8_END(name)
#else
#define BTF_ID_LIST(name) static u32 __maybe_unused name[64];
@ -218,6 +227,8 @@ extern struct btf_id_set8 name;
#define BTF_SET_END(name)
#define BTF_SET8_START(name) static struct btf_id_set8 __maybe_unused name = { 0 };
#define BTF_SET8_END(name)
#define BTF_KFUNCS_START(name) static struct btf_id_set8 __maybe_unused name = { .flags = BTF_SET8_KFUNCS };
#define BTF_KFUNCS_END(name)
#endif /* CONFIG_DEBUG_INFO_BTF */