From: Peter Zijlstra <peterz@infradead.org>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Menglong Dong <menglong8.dong@gmail.com>,
Jiri Olsa <jolsa@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Kees Cook <kees@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Mike Rapoport <rppt@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH] x86/ibt: make is_endbr() notrace
Date: Mon, 22 Sep 2025 08:36:16 +0200 [thread overview]
Message-ID: <20250922063616.GN3245006@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <CAADnVQLP6-s_dtGpEcnFaVJfDW12rTOS2qk5k0Fyvn=4Gn7gBw@mail.gmail.com>
On Thu, Sep 18, 2025 at 10:53:51AM -0700, Alexei Starovoitov wrote:
> > notrace don't help with kprobes in general, only with __fentry__ sites.
>
> Are you sure ? Last time I checked "notrace" prevents kprobing
> anywhere in that function.
#define notrace __attribute__((__no_instrument_function__))
AFAICT that only inhibits the compiler from generating __fentry__ calls.
There is NOKPROBE_SYMBOL() to explicitly exclude kprobes from a symbol.
And we have noinstr, which along with a gazillion code-gen attributes
puts things in a .noinstr.text section and that section is also excluded
from kprobe placement.
next prev parent reply other threads:[~2025-09-22 6:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 12:09 Menglong Dong
2025-09-18 13:05 ` Peter Zijlstra
2025-09-18 13:32 ` Menglong Dong
2025-09-18 16:02 ` Alexei Starovoitov
2025-09-18 16:59 ` Peter Zijlstra
2025-09-18 17:53 ` Alexei Starovoitov
2025-09-19 1:13 ` Menglong Dong
2025-09-22 6:52 ` Peter Zijlstra
2025-09-22 7:13 ` menglong.dong
2025-09-22 7:19 ` Peter Zijlstra
2025-09-22 7:21 ` Menglong Dong
2025-09-22 6:36 ` Peter Zijlstra [this message]
2025-09-18 16:56 ` Peter Zijlstra
2025-09-19 12:35 ` Masami Hiramatsu
2025-09-19 8:52 ` Masami Hiramatsu
2025-09-19 8:58 ` Menglong Dong
2025-09-19 12:32 ` Masami Hiramatsu
2025-09-19 11:57 ` [PATCH] tracing: fgraph: Protect return handler from recursion loop Masami Hiramatsu (Google)
2025-09-19 15:27 ` Steven Rostedt
2025-09-20 7:45 ` Jiri Olsa
2025-09-22 6:16 ` Masami Hiramatsu
2025-09-22 13:38 ` Jiri Olsa
2025-09-22 14:42 ` Steven Rostedt
2025-09-22 19:45 ` Jiri Olsa
2025-09-21 4:05 ` Masami Hiramatsu
2025-09-21 22:52 ` Steven Rostedt
2025-09-24 22:58 ` Masami Hiramatsu
2025-09-20 13:39 ` Menglong Dong
2025-09-21 4:06 ` Masami Hiramatsu
2025-09-21 23:00 ` Steven Rostedt
2025-09-24 22:59 ` Masami Hiramatsu
2025-09-22 5:19 ` Masami Hiramatsu
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