linux-kernel - Re: [PATCH v3] arm64: Restrict pagetable teardown to avoid false warning

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Message-Id: <174974002001.2447691.5560596379050052913.b4-ty@kernel.org>
Date: Thu, 12 Jun 2025 18:27:46 +0100
From: Will Deacon <will@...nel.org>
To: catalin.marinas@....com,
	Dev Jain <dev.jain@....com>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	david@...hat.com,
	ryan.roberts@....com,
	anshuman.khandual@....com,
	mark.rutland@....com,
	yang@...amperecomputing.com,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v3] arm64: Restrict pagetable teardown to avoid false warning

On Tue, 27 May 2025 13:56:33 +0530, Dev Jain wrote:
> Commit 9c006972c3fe removes the pxd_present() checks because the caller
> checks pxd_present(). But, in case of vmap_try_huge_pud(), the caller only
> checks pud_present(); pud_free_pmd_page() recurses on each pmd through
> pmd_free_pte_page(), wherein the pmd may be none. Thus it is possible to
> hit a warning in the latter, since pmd_none => !pmd_table(). Thus, add
> a pmd_present() check in pud_free_pmd_page().
> 
> [...]

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

[1/1] arm64: Restrict pagetable teardown to avoid false warning
      https://git.kernel.org/arm64/c/650768c512fa

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev