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From: "Björn Töpel" <bjorn@kernel.org>
To: Andy Chiu <andybnac@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
	linux-riscv@lists.infradead.org, llvm@lists.linux.dev,
	bjorn@rivosinc.com, puranjay12@gmail.com, alexghiti@rivosinc.com,
	yongxuan.wang@sifive.com, greentime.hu@sifive.com,
	nick.hu@sifive.com, nylon.chen@sifive.com, tommy.wu@sifive.com,
	eric.lin@sifive.com, viccent.chen@sifive.com, zong.li@sifive.com,
	samuel.holland@sifive.com
Subject: Re: [PATCH v3 1/7] riscv: ftrace: support fastcc in Clang for WITH_ARGS
Date: Tue, 03 Dec 2024 13:05:30 +0100	[thread overview]
Message-ID: <87wmghotth.fsf@all.your.base.are.belong.to.us> (raw)
In-Reply-To: <20241127172908.17149-2-andybnac@gmail.com>

Andy Chiu <andybnac@gmail.com> writes:

> From: Andy Chiu <andy.chiu@sifive.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@yadro.com>
> Closes: https://lore.kernel.org/linux-riscv/7e7c7914-445d-426d-89a0-59a9199c45b1@yadro.com/
> Acked-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Andy Chiu <andy.chiu@sifive.com>

Fixes tag?

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

  reply	other threads:[~2024-12-03 12:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20241127172908.17149-1-andybnac@gmail.com>
2024-11-27 17:29 ` [PATCH v3 1/7] riscv: ftrace: support fastcc in Clang for WITH_ARGS Andy Chiu
2024-12-03 12:05   ` Björn Töpel [this message]
2024-12-03 14:44     ` Evgenii Shatokhin
2024-11-27 17:29 ` [PATCH v3 3/7] riscv: ftrace: prepare ftrace for atomic code patching Andy Chiu
2024-12-01 15:31   ` Evgenii Shatokhin
2024-12-02  7:29     ` Evgenii Shatokhin
2024-12-06 10:02   ` Björn Töpel
2024-12-06 23:35     ` Bagas Sanjaya
2024-12-09 14:57     ` Robbin Ehn
2024-11-27 17:29 ` [PATCH v3 4/7] riscv: ftrace: do not use stop_machine to update code Andy Chiu

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