linux-kernel - Re: [PATCH] arm64, mm: avoid always making PTE dirty in pte

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Message-ID: <176106354573.3697793.9595844737584948515.b4-ty@arm.com>
Date: Tue, 21 Oct 2025 17:19:05 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Will Deacon <will@...nel.org>,
	Huang Ying <ying.huang@...ux.alibaba.com>
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Ryan Roberts <ryan.roberts@....com>,
	Gavin Shan <gshan@...hat.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Yicong Yang <yangyicong@...ilicon.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64, mm: avoid always making PTE dirty in pte_mkwrite()

On Wed, 15 Oct 2025 10:37:12 +0800, Huang Ying wrote:
> Current pte_mkwrite_novma() makes PTE dirty unconditionally.  This may
> mark some pages that are never written dirty wrongly.  For example,
> do_swap_page() may map the exclusive pages with writable and clean PTEs
> if the VMA is writable and the page fault is for read access.
> However, current pte_mkwrite_novma() implementation always dirties the
> PTE.  This may cause unnecessary disk writing if the pages are
> never written before being reclaimed.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64, mm: avoid always making PTE dirty in pte_mkwrite()
      https://git.kernel.org/arm64/c/143937ca51cc

-- 
Catalin