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Date: Wed, 7 Jan 2026 10:38:40 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Gary Guo <gary@garyguo.net>, Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	James Clark <james.clark@linaro.org>,
	Miguel Ojeda <ojeda@kernel.org>, Boqun Feng <boqun.feng@gmail.com>,
	=?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
	Benno Lossin <lossin@kernel.org>,
	Andreas Hindborg <a.hindborg@kernel.org>,
	Alice Ryhl <aliceryhl@google.com>, Trevor Gross <tmgross@umich.edu>,
	Danilo Krummrich <dakr@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>,
	Andi Kleen <ak@linux.intel.com>, Dmitry Vyukov <dvyukov@google.com>,
	Stephen Brennan <stephen.s.brennan@oracle.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	rust-for-linux@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH v2] perf symbol: remove Rust symbol workarounds
Message-ID: <aV5h4I5rRl61vFFu@x1>
References: <20260105150106.567830-1-gary@kernel.org>
 <aVvdt90YmhJz3i5i@x1>
 <aV4TkNE_hAyByISq@google.com>
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In-Reply-To: <aV4TkNE_hAyByISq@google.com>

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 I'm afraid there may be some outdated kernels which don't have the fix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