linux-kernel - Re: [PATCH v3 1/7] riscv: ftrace: support fastcc in Clang for WITH

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Message-ID: <87wmghotth.fsf@all.your.base.are.belong.to.us>
Date: Tue, 03 Dec 2024 13:05:30 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Andy Chiu <andybnac@...il.com>, Steven Rostedt <rostedt@...dmis.org>,
 Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland
 <mark.rutland@....com>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer
 Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Nathan
 Chancellor <nathan@...nel.org>, Nick Desaulniers
 <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>, Justin Stitt
 <justinstitt@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, llvm@...ts.linux.dev, bjorn@...osinc.com,
 puranjay12@...il.com, alexghiti@...osinc.com, yongxuan.wang@...ive.com,
 greentime.hu@...ive.com, nick.hu@...ive.com, nylon.chen@...ive.com,
 tommy.wu@...ive.com, eric.lin@...ive.com, viccent.chen@...ive.com,
 zong.li@...ive.com, samuel.holland@...ive.com
Subject: Re: [PATCH v3 1/7] riscv: ftrace: support fastcc in Clang for
 WITH_ARGS

Andy Chiu <andybnac@...il.com> writes:

> From: Andy Chiu <andy.chiu@...ive.com>
>
> Some caller-saved registers which are not defined as function arguments
> in the ABI can still be passed as arguments when the kernel is compiled
> with Clang. As a result, we must save and restore those registers to
> prevent ftrace from clobbering them.
>
> - [1]: https://reviews.llvm.org/D68559
>
> Reported-by: Evgenii Shatokhin <e.shatokhin@...ro.com>
> Closes: https://lore.kernel.org/linux-riscv/7e7c7914-445d-426d-89a0-59a9199c45b1@yadro.com/
> Acked-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Andy Chiu <andy.chiu@...ive.com>

Fixes tag?

Reviewed-by: Björn Töpel <bjorn@...osinc.com>