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tools/bpf: Sync btf_ids.h to tools

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Sync tools/include/linux/btf_ids.h with include/linux/btf_ids.h so
tools-side code can use BTF_ID_FLAGS(), BTF_SET8_START(), and
BTF_KFUNCS_START().

Keep the tools copy's existing compiler header dependency:
tools/include/linux/compiler.h already provides __maybe_unused and
tools/include/linux/compiler_attributes.h does not exist.

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260624005546.1818483-2-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ihor Solodrai
2026-06-23 17:55:43 -07:00
committed by Alexei Starovoitov
parent df3153758d
commit 1dbf26eca0
1 changed files with 73 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

78
tools/include/linux/btf_ids.h
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@@ -10,6 +10,9 @@ 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;
@@ -22,6 +25,7 @@ struct btf_id_set8 {
#ifdef CONFIG_DEBUG_INFO_BTF
#include <linux/compiler.h> /* for __PASTE */
#include <linux/stringify.h>
/*
* Following macros help to define lists of BTF IDs placed
@@ -35,7 +39,7 @@ struct btf_id_set8 {
#define BTF_IDS_SECTION ".BTF_ids"
#define ____BTF_ID(symbol) \
#define ____BTF_ID(symbol, word) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
".local " #symbol " ; \n" \
@@ -43,10 +47,11 @@ asm( \
".size " #symbol ", 4; \n" \
#symbol ": \n" \
".zero 4 \n" \
word \
".popsection; \n");
#define __BTF_ID(symbol) \
____BTF_ID(symbol)
#define __BTF_ID(symbol, word) \
____BTF_ID(symbol, word)
#define __ID(prefix) \
__PASTE(__PASTE(prefix, __COUNTER__), __LINE__)
@@ -56,7 +61,14 @@ asm( \
* to 4 zero bytes.
*/
#define BTF_ID(prefix, name) \
__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__))
__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), "")
#define ____BTF_ID_FLAGS(prefix, name, flags) \
__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), ".long " #flags "\n")
#define __BTF_ID_FLAGS(prefix, name, flags, ...) \
____BTF_ID_FLAGS(prefix, name, flags)
#define BTF_ID_FLAGS(prefix, name, ...) \
__BTF_ID_FLAGS(prefix, name, ##__VA_ARGS__, 0)
/*
* The BTF_ID_LIST macro defines pure (unsorted) list
@@ -155,10 +167,58 @@ asm( \
".popsection; \n"); \
extern struct btf_id_set name;
/*
* The BTF_SET8_START/END macros pair defines sorted list of
* BTF IDs and their flags plus its members count, with the
* following layout:
*
* BTF_SET8_START(list)
* BTF_ID_FLAGS(type1, name1, flags)
* BTF_ID_FLAGS(type2, name2, flags)
* BTF_SET8_END(list)
*
* __BTF_ID__set8__list:
* .zero 8
* list:
* __BTF_ID__type1__name1__3:
* .zero 4
* .word (1 << 0) | (1 << 2)
* __BTF_ID__type2__name2__5:
* .zero 4
* .word (1 << 3) | (1 << 1) | (1 << 2)
*
*/
#define __BTF_SET8_START(name, scope, flags) \
__BTF_ID_LIST(name, local) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
"." #scope " __BTF_ID__set8__" #name "; \n" \
"__BTF_ID__set8__" #name ":; \n" \
".zero 4 \n" \
".long " __stringify(flags) "\n" \
".popsection; \n");
#define BTF_SET8_START(name) \
__BTF_SET8_START(name, local, 0)
#define BTF_SET8_END(name) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
".size __BTF_ID__set8__" #name ", .-" #name " \n" \
".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[5];
#define BTF_ID_LIST(name) static u32 __maybe_unused name[128];
#define BTF_ID(prefix, name)
#define BTF_ID_FLAGS(prefix, name, ...)
#define BTF_ID_UNUSED
#define BTF_ID_LIST_GLOBAL(name, n) u32 __maybe_unused name[n];
#define BTF_ID_LIST_SINGLE(name, prefix, typename) static u32 __maybe_unused name[1];
@@ -166,6 +226,10 @@ extern struct btf_id_set name;
#define BTF_SET_START(name) static struct btf_id_set __maybe_unused name = { 0 };
#define BTF_SET_START_GLOBAL(name) static struct btf_id_set __maybe_unused name = { 0 };
#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 */
@@ -215,5 +279,9 @@ MAX_BTF_TRACING_TYPE,
};
extern u32 btf_tracing_ids[];
extern u32 bpf_cgroup_btf_id[];
extern u32 bpf_local_storage_map_btf_id[];
extern u32 btf_bpf_map_id[];
extern u32 bpf_kmem_cache_btf_id[];
#endif