linux-kernel - Re: [PATCH v2 2/4] riscv: uaccess: use input constraints for ptr of __put

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Message-ID: <Z4rmf0e9zzp6-uBp@ghost>
Date: Fri, 17 Jan 2025 15:23:43 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Cyril Bur <cyrilbur@...storrent.com>
Cc: palmer@...belt.com, aou@...s.berkeley.edu, paul.walmsley@...ive.com,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jisheng Zhang <jszhang@...nel.org>
Subject: Re: [PATCH v2 2/4] riscv: uaccess: use input constraints for ptr of
 __put_user

On Mon, Nov 18, 2024 at 11:01:10PM +0000, Cyril Bur wrote:
> From: Jisheng Zhang <jszhang@...nel.org>
> 
> I believe the output constraints "=m" is not necessary, because
> the instruction itself is "write", we don't need the compiler
> to "write" for us. So tell compiler we read from memory instead
> of writing.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> Signed-off-by: Cyril Bur <cyrilbur@...storrent.com>

Reviewed-by: Charlie Jenkins <charlie@...osinc.com>
Tested-by: Charlie Jenkins <charlie@...osinc.com>