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| author | Jiri Olsa <jolsa@kernel.org> | 2026-07-03 13:49:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2026-07-04 10:56:56 +0200 |
| commit | 6d91200bcbb52020f33a26f9e92ba309b804fdba (patch) | |
| tree | 1e11835bdcc6f643b14f05550869b37860539086 | |
| parent | 8cae54c586084c81ab80f6ab020192eb2ce7aa0b (diff) | |
| download | linux-6d91200bcbb52020f33a26f9e92ba309b804fdba.tar.gz linux-6d91200bcbb52020f33a26f9e92ba309b804fdba.zip | |
selftests/bpf: Emit nop,nop10 instructions combo for x86_64 arch
Syncing latest usdt.h change [1].
Now that we have nop10 optimization support in kernel, let's emit
nop,nop10 for usdt probe. We leave it up to the library to use
desirable nop instruction.
[1] https://github.com/libbpf/usdt/commit/9018f82577d1dad7ed628d9efdaffc09f8f2241b
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://patch.msgid.link/20260703114917.238144-9-jolsa@kernel.org
| -rw-r--r-- | tools/testing/selftests/bpf/usdt.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/usdt.h b/tools/testing/selftests/bpf/usdt.h index c71e21df38b3..75687f50f4e2 100644 --- a/tools/testing/selftests/bpf/usdt.h +++ b/tools/testing/selftests/bpf/usdt.h @@ -313,7 +313,7 @@ struct usdt_sema { volatile unsigned short active; }; #if defined(__ia64__) || defined(__s390__) || defined(__s390x__) #define USDT_NOP nop 0 #elif defined(__x86_64__) -#define USDT_NOP .byte 0x90, 0x0f, 0x1f, 0x44, 0x00, 0x0 /* nop, nop5 */ +#define USDT_NOP .byte 0x90, 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 /* nop, nop10 */ #else #define USDT_NOP nop #endif |