linux-kernel - Re: [PATCH v2] arm64/mm: avoid fixmap race condition when create pud mapping

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Message-Id: <163941094777.2464379.2692109101400876104.b4-ty@kernel.org>
Date:   Mon, 13 Dec 2021 16:42:44 +0000
From:   Will Deacon <will@...nel.org>
To:     anshuman.khandual@....com, catalin.marinas@....com,
        Jianyong Wu <jianyong.wu@....com>, akpm@...ux-foundation.org
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, gshan@...hat.com,
        david@...hat.com, justin.he@....com, ardb@...nel.org, nd@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64/mm: avoid fixmap race condition when create pud mapping

On Fri, 10 Dec 2021 17:54:32 +0800, Jianyong Wu wrote:
> fixmap is a global resource and is used recursively in create pud mapping.
> It may lead to race condition when alloc_init_pud is called concurrently.
> 
> Fox example:
> alloc_init_pud is called when kernel_init. If memory hotplug
> thread, which will also call alloc_init_pud, happens during
> kernel_init, the race for fixmap occurs.
> 
> [...]

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

[1/1] arm64/mm: avoid fixmap race condition when create pud mapping
      https://git.kernel.org/arm64/c/a6a6b9aa34e5

Cheers,
-- 
Will

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