From: Aurelien Jarno <aurelien@aurel32.net>
To: Troy Mitchell <troy.mitchell@linux.dev>
Cc: "Paul Walmsley" <pjw@kernel.org>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Guo Ren" <guoren@kernel.org>, "Andy Chiu" <andybnac@gmail.com>,
"Vincent Chen" <vincent.chen@sifive.com>,
"Björn Töpel" <bjorn@rivosinc.com>,
"Alexandre Ghiti" <alex@ghiti.fr>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
"Palmer Dabbelt" <palmer@rivosinc.com>,
"Greentime Hu" <greentime.hu@sifive.com>,
"Heiko Stuebner" <heiko@sntech.de>,
"Conor Dooley" <conor.dooley@microchip.com>,
"Kevin Zhang" <zhangmeng.kevin@linux.spacemit.com>
Subject: Re: [PATCH] riscv: vector: Fix data pointer constraints in context save/restore
Date: Fri, 11 Sep 2026 20:23:17 +0200 [thread overview]
Message-ID: <aqRHFfR-v8yQP4My@aurel32.net> (raw)
In-Reply-To: <20260908-riscv-vector-asm-fix-v1-1-147f314efb2b@linux.dev>
On 2026-09-08 21:03, Troy Mitchell wrote:
> The standard vector save/restore asm advances datap but declares it as
> input-only. An inlined caller reusing the original pointer may therefore
> use the advanced address instead.
>
> Declare datap as read-write so the compiler can preserve the original
> pointer when needed.
>
> Fixes: 03c3fcd9941a ("riscv: Introduce struct/helpers to save/restore per-task Vector state")
> Signed-off-by: Troy Mitchell <troy.mitchell@linux.dev>
> ---
> arch/riscv/include/asm/vector.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurelien@aurel32.net http://aurel32.net
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next prev parent reply other threads:[~2026-09-11 18:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-08 13:03 [PATCH] riscv: vector: Fix data pointer constraints in context save/restore Troy Mitchell
2026-09-11 6:56 ` Guo Ren
2026-09-12 9:21 ` Troy Mitchell
2026-09-11 18:23 ` Aurelien Jarno [this message]
2026-09-11 19:01 ` Andy Chiu
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