linux-kernel - Re: [PATCH v2] perf symbol: remove Rust symbol workarounds

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Message-ID: <aV5h4I5rRl61vFFu@x1>
Date: Wed, 7 Jan 2026 10:38:40 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Gary Guo <gary@...yguo.net>, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	James Clark <james.clark@...aro.org>,
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, Dmitry Vyukov <dvyukov@...gle.com>,
	Stephen Brennan <stephen.s.brennan@...cle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2] perf symbol: remove Rust symbol workarounds

On Wed, Jan 07, 2026 at 12:04:32AM -0800, Namhyung Kim wrote:
> On Mon, Jan 05, 2026 at 12:50:15PM -0300, Arnaldo Carvalho de Melo wrote:
> > On Mon, Jan 05, 2026 at 03:00:57PM +0000, Gary Guo wrote:
> > > Due to an off-by-one error introduced in commit 73bbb94466fd ("kallsyms:
> > > support "big" kernel symbols"), long symbols (which are currently only
> > > produced by Rust) can have their symbol type being wrongly parsed by
> > > kernel/kallsyms.c.
 
> > Looks sane, applied to perf-tools-next,
   
> I'm afraid there may be some outdated kernels which don't have the fix
> yet.  Maybe make sense to wait some more time for them to disappear?

Right, I took it more as it seems to be just a blip in time, something
that came and went quickly and that most likely will not cause problems,
i.e. just a handful of extra symbols in the lookup data structures in
those particular kernels and a new 'perf test' tool with these reverts,
if run on those particular kernels would then fail for that particular
test case, for a known reason.

So with the above rationale you still feel strongly about having it
applied?

- Arnaldo