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Message-ID: <7ebc5b28-7115-494f-a607-e46c71214cce@ghiti.fr>
Date: Fri, 3 May 2024 14:16:18 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Xiao Wang <xiao.w.wang@...el.com>, paul.walmsley@...ive.com,
palmer@...belt.com, aou@...s.berkeley.edu
Cc: jerry.shih@...ive.com, nick.knight@...ive.com, ajones@...tanamicro.com,
bjorn@...osinc.com, andy.chiu@...ive.com, viro@...iv.linux.org.uk,
cleger@...osinc.com, alexghiti@...osinc.com, haicheng.li@...el.com,
akira.tsukamoto@...il.com, linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: uaccess: Allow the last potential unrolled copy
Hi Xiao,
On 13/03/2024 11:33, Xiao Wang wrote:
> When the dst buffer pointer points to the last accessible aligned addr, we
> could still run another iteration of unrolled copy.
>
> Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>
> ---
> arch/riscv/lib/uaccess.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
> index 2e665f8f8fcc..1399d797d81b 100644
> --- a/arch/riscv/lib/uaccess.S
> +++ b/arch/riscv/lib/uaccess.S
> @@ -103,7 +103,7 @@ SYM_FUNC_START(fallback_scalar_usercopy)
> fixup REG_S t4, 7*SZREG(a0), 10f
> addi a0, a0, 8*SZREG
> addi a1, a1, 8*SZREG
> - bltu a0, t0, 2b
> + bleu a0, t0, 2b
>
> addi t0, t0, 8*SZREG /* revert to original value */
> j .Lbyte_copy_tail
I agree it is still safe to continue for another word_copy here.
Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
Thanks,
Alex
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