[tip: perf/core] selftests/bpf: Emit nop,nop10 instructions combo for x86_64 arch

[tip-bot2 for Jiri Olsa]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     d44c12dbeff02180f1e9cadb52d5c939cfb3f75f
Gitweb:        https://git.kernel.org/tip/d44c12dbeff02180f1e9cadb52d5c939cfb3f75f
Author:        Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate:    Fri, 03 Jul 2026 13:49:12 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Fri, 03 Jul 2026 16:30:37 +02:00

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@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260703114917.238144-9-jolsa@xxxxxxxxxx
---
 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 c71e21d..75687f5 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