From: Jiri Olsa <jolsa@kernel.org>
To: Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: [PATCH 3/7] selftests/bpf: Emit nop,nop10 instructions combo for x86_64 arch
Date: Thu, 14 May 2026 15:53:38 +0200 [thread overview]
Message-ID: <20260514135342.22130-4-jolsa@kernel.org> (raw)
In-Reply-To: <20260514135342.22130-1-jolsa@kernel.org>
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] TBD
Signed-off-by: Jiri Olsa <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..d359663b9c32 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, 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 /* nop, nop10 */
#else
#define USDT_NOP nop
#endif
--
2.53.0
next prev parent reply other threads:[~2026-05-14 13:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-14 13:53 [PATCH 0/7] uprobes/x86: Fix red zone issue for optimized uprobes Jiri Olsa
2026-05-14 13:53 ` [PATCH 1/7] uprobes/x86: Move optimized uprobe from nop5 to nop10 Jiri Olsa
2026-05-14 16:54 ` Jakub Sitnicki
2026-05-14 13:53 ` [PATCH 2/7] libbpf: Change has_nop_combo to work on top of nop10 Jiri Olsa
2026-05-14 14:55 ` bot+bpf-ci
2026-05-14 13:53 ` Jiri Olsa [this message]
2026-05-14 13:53 ` [PATCH 4/7] selftests/bpf: Change uprobe syscall tests to use nop10 Jiri Olsa
2026-05-14 13:53 ` [PATCH 5/7] selftests/bpf: Change uprobe/usdt trigger bench code " Jiri Olsa
2026-05-14 13:53 ` [PATCH 6/7] selftests/bpf: Add reattach tests for uprobe syscall Jiri Olsa
2026-05-14 13:53 ` [PATCH 7/7] selftests/bpf: Add tests for uprobe nop10 red zone clobbering Jiri Olsa
2026-05-14 14:55 ` bot+bpf-ci
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