linux-kernel - Re: [PATCH v5] arm64: mte: move register initialization to C

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Date:   Thu, 22 Sep 2022 21:01:37 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Evgenii Stepanov <eugenis@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>
Cc:     Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Kenny Root <kroot@...gle.com>, Mark Brown <broonie@...nel.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>, stable@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5] arm64: mte: move register initialization to C

On Thu, 15 Sep 2022 15:20:53 -0700, Evgenii Stepanov wrote:
> From: Peter Collingbourne <pcc@...gle.com>
> 
> If FEAT_MTE2 is disabled via the arm64.nomte command line argument on a
> CPU that claims to support FEAT_MTE2, the kernel will use Tagged Normal
> in the MAIR. If we interpret arm64.nomte to mean that the CPU does not
> in fact implement FEAT_MTE2, setting the system register like this may
> lead to UNSPECIFIED behavior. Fix it by arranging for MAIR to be set
> in the C function cpu_enable_mte which is called based on the sanitized
> version of the system register.
> 
> [...]

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

[1/1] arm64: mte: move register initialization to C
      https://git.kernel.org/arm64/c/973b9e373306

-- 
Catalin