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Message-ID: <20220818170543.2e361e7d@gandalf.local.home>
Date: Thu, 18 Aug 2022 17:05:43 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Jiri Olsa <olsajiri@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Ingo Molnar <mingo@...hat.com>, bpf <bpf@...r.kernel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [RFC] ftrace: Add support to keep some functions out of ftrace
On Thu, 18 Aug 2022 14:00:21 -0700
Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> > #ifdef CONFIG_X86
> > # define NON_MCOUNT_PATCHABLE KEEP(*(__patchable_function_entries))
> > # define MCOUNT_PATCHABLE
> > #else
> > # define NON_MCOUNT_PATCHABLE
> > # define MCOUNT_PATCHABLE KEEP(*(__patchable_function_entries))
> > #endif
> >
> > #define MCOUNT_REC() . = ALIGN(8); \
> > __start_mcount_loc = .; \
> > KEEP(*(__mcount_loc)) \
> > MCOUNT_PATCHABLE \
> > __stop_mcount_loc = .; \
> > NON_MCOUNT_PATCHABLE \
> > ...
> >
> > ??
>
> That's what more or less Peter's patch is doing:
Heh.
> Here it is again for reference:
> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=8d075bdf11193f1d276bf19fa56b4b8dfe24df9e
Thanks, I missed seeing this.
-- Steve
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