linux-kernel - Re: [PATCH 1/1] perf symbols: Handle '1' symbols in /proc/kallsyms

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Message-ID: <CANiq72ns1sRukpX-4L3FgqfJw4nXZ5AyqQKCEeQ=nhyERG7QGA@mail.gmail.com>
Date: Fri, 7 Nov 2025 02:35:34 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Alice Ryhl <aliceryhl@...gle.com>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Benno Lossin <lossin@...nel.org>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Boqun Feng <boqun.feng@...il.com>, Danilo Krummrich <dakr@...nel.org>, Gary Guo <gary@...yguo.net>, 
	Trevor Gross <tmgross@...ch.edu>, Adrian Hunter <adrian.hunter@...el.com>, 
	Ian Rogers <irogers@...gle.com>, James Clark <james.clark@...aro.org>, 
	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1] perf symbols: Handle '1' symbols in /proc/kallsyms

On Thu, Nov 6, 2025 at 9:25 PM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> So far, '1' symbols are Rust symbols, in the Linux kernel, for unnamed
> closures and its prefix code checking for stack space, Miguel, do you
> have something to add?

Wait, is `1` the symbol type? I don't know what that is. That column
in `readelf` isn't the symbol type, no?

And if I use `nm` on Fedora's `vmlinux`, I get a `t` (and the
`System.map` has the same). Something is fishy in `/proc/kallsyms`.

We don't handle the big symbol double-byte... I will send a patch.

Cheers,
Miguel