linux-kernel - Re: [PATCH v2] arm64/cpufeature: annotate arm64_use_ng_mappings with ro_after

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Message-Id: <174626735218.2189871.10298017577558632540.b4-ty@arm.com>
Date: Sat,  3 May 2025 11:16:12 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: will@...nel.org,
	nathan@...nel.org,
	nick.desaulniers+lkml@...il.com,
	morbo@...gle.com,
	justinstitt@...gle.com,
	broonie@...nel.org,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	joey.gouly@....com,
	shameerali.kolothum.thodi@...wei.com,
	james.morse@....com,
	hardevsinh.palaniya@...iconsignals.io,
	ardb@...nel.org,
	ryan.roberts@....com,
	Yeoreum Yun <yeoreum.yun@....com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] arm64/cpufeature: annotate arm64_use_ng_mappings with ro_after_init to prevent wrong idmap generation

On Fri, 02 May 2025 19:04:12 +0100, Yeoreum Yun wrote:
> create_init_idmap() could be called before .bss section initialization
> which is done in early_map_kernel().
> Therefore, data/test_prot could be set incorrectly by PTE_MAYBE_NG macro.
> 
> PTE_MAYBE_NG macro set NG bit according to value of "arm64_use_ng_mappings".
> and this variable places in .bss section.
> 
> [...]

Applied to arm64 (for-next/fixes), with some slight tweaking of the
comment, thanks!

[1/1] arm64/cpufeature: annotate arm64_use_ng_mappings with ro_after_init to prevent wrong idmap generation
      https://git.kernel.org/arm64/c/12657bcd1835

-- 
Catalin