linux-kernel - Re: [PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

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Message-ID: <e3cfd2f2-5d30-455f-8d10-66a2a71c13c7@ghiti.fr>
Date: Fri, 31 May 2024 07:45:42 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Palmer Dabbelt <palmer@...osinc.com>, linux-riscv@...ts.infradead.org
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu,
 surenb@...gle.com, akpm@...ux-foundation.org, alexghiti@...osinc.com,
 wangkefeng.wang@...wei.com, jszhang@...nel.org, ben@...adent.org.uk,
 Bjorn Topel <bjorn@...osinc.com>, willy@...radead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "riscv: mm: accelerate pagefault when badaccess"

On 30/05/2024 18:44, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@...osinc.com>
>
> I accidentally picked up an earlier version of this patch, which had
> already landed via mm.  The patch  I picked up contains a bug, which I
> kept as I thought it was a fix.  So let's just revert it.
>
> This reverts commit 4c6c0020427a4547845a83f7e4d6085e16c3e24f.
>
> Fixes: 4c6c0020427a ("riscv: mm: accelerate pagefault when badaccess")
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> ---
>   arch/riscv/mm/fault.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
> index b3fcf7d67efb..5224f3733802 100644
> --- a/arch/riscv/mm/fault.c
> +++ b/arch/riscv/mm/fault.c
> @@ -293,8 +293,8 @@ void handle_page_fault(struct pt_regs *regs)
>   	if (unlikely(access_error(cause, vma))) {
>   		vma_end_read(vma);
>   		count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
> -		tsk->thread.bad_cause = SEGV_ACCERR;
> -		bad_area_nosemaphore(regs, code, addr);
> +		tsk->thread.bad_cause = cause;
> +		bad_area_nosemaphore(regs, SEGV_ACCERR, addr);
>   		return;
>   	}
>   


Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>