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selftests/bpf: Emit nop,nop10 instructions combo for x86_64 arch

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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] 9018f82577

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
This commit is contained in:
Jiri Olsa
2026-07-03 13:49:12 +02:00
committed by Ingo Molnar
parent 8cae54c586
commit 6d91200bcb
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/usdt.h
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@@ -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