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bpf: btf: Support flags for BTF_SET8 sets

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This commit adds support for flags on BTF_SET8s. struct btf_id_set8
already supported 32 bits worth of flags, but was only used for
alignment purposes before.

We now use these bits to encode flags. The first use case is tagging
kfunc sets with a flag so that pahole can recognize which
BTF_ID_FLAGS(func, ..) are actual kfuncs.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/7bb152ec76d6c2c930daec88e995bf18484a5ebb.1706491398.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Xu 2024-01-28 18:24:06 -07:00 committed by Alexei Starovoitov
parent 2ef61296d2
commit 79b47344bb
1 changed files with 6 additions and 4 deletions
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10
include/linux/btf_ids.h
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@ -21,6 +21,7 @@ struct btf_id_set8 {
#include <linux/compiler.h> /* for __PASTE */
#include <linux/compiler_attributes.h> /* for __maybe_unused */
#include <linux/stringify.h>
/*
* Following macros help to define lists of BTF IDs placed
@ -183,17 +184,18 @@ extern struct btf_id_set name;
* .word (1 << 3) | (1 << 1) | (1 << 2)
*
*/
#define __BTF_SET8_START(name, scope) \
#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 8 \n" \
".zero 4 \n" \
".long " __stringify(flags) "\n" \
".popsection; \n");
#define BTF_SET8_START(name) \
__BTF_ID_LIST(name, local) \
__BTF_SET8_START(name, local)
__BTF_SET8_START(name, local, 0)
#define BTF_SET8_END(name) \
asm( \