linux-kernel - Re: [PATCH 6.6 4/4] riscv: Use accessors to page table entries instead of direct dereference

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Message-ID: <2024090808-elusive-deviate-3bbb@gregkh>
Date: Sun, 8 Sep 2024 16:10:19 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: WangYuli <wangyuli@...ontech.com>
Cc: stable@...r.kernel.org, sashal@...nel.org, alexghiti@...osinc.com,
	palmer@...osinc.com, paul.walmsley@...ive.com, palmer@...belt.com,
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Subject: Re: [PATCH 6.6 4/4] riscv: Use accessors to page table entries
 instead of direct dereference

On Fri, Sep 06, 2024 at 04:22:39PM +0800, WangYuli wrote:
> From: Alexandre Ghiti <alexghiti@...osinc.com>
> 
> [ Upstream commit edf955647269422e387732870d04fc15933a25ea ]
> 
> As very well explained in commit 20a004e7b017 ("arm64: mm: Use
> READ_ONCE/WRITE_ONCE when accessing page tables"), an architecture whose
> page table walker can modify the PTE in parallel must use
> READ_ONCE()/WRITE_ONCE() macro to avoid any compiler transformation.
> 
> So apply that to riscv which is such architecture.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> Acked-by: Anup Patel <anup@...infault.org>
> Link: https://lore.kernel.org/r/20231213203001.179237-5-alexghiti@rivosinc.com
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> Signed-off-by: WangYuli <wangyuli@...ontech.com>
> ---

all now queued up, thanks.

greg k-h