linux-kernel - Re: [PATCH] kallsyms: ignore ARMv4 thunks along with others

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Message-Id: <23b58d3c-82eb-450f-a246-f8a91b8e8075@app.fastmail.com>
Date: Wed, 14 Feb 2024 21:45:43 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Masahiro Yamada" <masahiroy@...nel.org>,
 "Arnd Bergmann" <arnd@...nel.org>
Cc: "Nathan Chancellor" <nathan@...nel.org>,
 "Nicolas Schier" <nicolas@...sle.eu>,
 Pierre-Clément Tosi <ptosi@...gle.com>,
 "Ard Biesheuvel" <ardb@...nel.org>, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kallsyms: ignore ARMv4 thunks along with others

On Wed, Feb 14, 2024, at 21:34, Masahiro Yamada wrote:
> On Thu, Feb 15, 2024 at 3:19 AM Arnd Bergmann <arnd@...nel.org> wrote:
> If this is a recurring problem,
> maybe is it better to use a regular expression?
>
>
> Remove these lines:
>
> # arm64 lld
> / __AArch64ADRPThunk_/d
>
> # arm lld
> / __ARMV5PILongThunk_/d
> / __ARMV7PILongThunk_/d
> / __ThumbV7PILongThunk_/d
>
> # mips lld
> / __LA25Thunk_/d
> / __microLA25Thunk_/d
>
>
>
>
>
> Add this:
>
> # lld
> / __[^[:space:]]*Thunk_/d
>
> This pattern is only used in tooling,
> but never in the kernel space.

Right, makes sense. There is always a risk of removing
intential kernel symbols and this is slightly higher
with the regex but still not that bad.

I'll give this a spin and send a v2 tomorrow then.

    Arnd