From 6d91200bcbb52020f33a26f9e92ba309b804fdba Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Fri, 3 Jul 2026 13:49:12 +0200 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Reviewed-by: Jakub Sitnicki Link: https://patch.msgid.link/20260703114917.238144-9-jolsa@kernel.org --- tools/testing/selftests/bpf/usdt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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