From: Oleg Nesterov <oleg@redhat.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org, x86@kernel.org,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
Hao Luo <haoluo@google.com>, Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Alan Maguire <alan.maguire@oracle.com>
Subject: Re: [PATCHv2 perf/core 1/2] uprobes/x86: Add support to emulate nop instructions
Date: Fri, 11 Apr 2025 14:48:03 +0200 [thread overview]
Message-ID: <20250411124802.GE5322@redhat.com> (raw)
In-Reply-To: <20250411121756.567274-1-jolsa@kernel.org>
On 04/11, Jiri Olsa wrote:
>
> --- a/arch/x86/kernel/uprobes.c
> +++ b/arch/x86/kernel/uprobes.c
> @@ -840,6 +840,12 @@ static int branch_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
> insn_byte_t p;
> int i;
>
> + /* x86_nops[i]; same as jmp with .offs = 0 */
> + for (i = 1; i <= ASM_NOP_MAX; ++i) {
> + if (!memcmp(insn->kaddr, x86_nops[i], i))
> + goto setup;
> + }
Acked-by: Oleg Nesterov <oleg@redhat.com>
next prev parent reply other threads:[~2025-04-11 12:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-11 12:17 [PATCHv2 perf/core 1/2] uprobes/x86: Add support to emulate nop instructions Jiri Olsa
2025-04-11 12:17 ` [PATCHv2 perf/core 2/2] selftests/bpf: Add 5-byte nop uprobe trigger bench Jiri Olsa
2025-04-11 12:48 ` Oleg Nesterov [this message]
2025-04-11 16:02 ` [PATCHv2 perf/core 1/2] uprobes/x86: Add support to emulate nop instructions Andrii Nakryiko
2025-04-11 16:32 ` Oleg Nesterov
2025-04-13 19:05 ` Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250411124802.GE5322@redhat.com \
--to=oleg@redhat.com \
--cc=alan.maguire@oracle.com \
--cc=andrii@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=haoluo@google.com \
--cc=john.fastabend@gmail.com \
--cc=jolsa@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=songliubraving@fb.com \
--cc=x86@kernel.org \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.