linux-kernel - Re: [PATCH] ARM: Add workaround for I-Cache line size mismatch between CPU cores

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Message-ID: <CAJKOXPcgbSHDAnRc+9dtiuLOQ2Ah9mVrYvEdd33M_AAuC5Z5xg@mail.gmail.com>
Date:   Wed, 29 May 2019 10:41:59 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        Andre Przywara <andre.przywara@....com>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>
Subject: Re: [PATCH] ARM: Add workaround for I-Cache line size mismatch
 between CPU cores

On Tue, 28 May 2019 at 10:29, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
> Some big.LITTLE systems have I-Cache line size mismatch between
> LITTLE and big cores. This patch adds a workaround for proper I-Cache
> support on such systems. Without it, some class of the userspace code
> (typically self-modifying) might suffer from random SIGILL failures.
>
> Similar workaround already exists for ARM64 architecture. I has been
> added by commit 116c81f427ff ("arm64: Work around systems with mismatched
> cache line sizes").
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> This workaround is needed on all supported Exynos big.LITTLE SoCs: 5420,
> 5422 and 5800.
>
> Resend reason: removed RFC tag as there are no comments, I will upload
> this patch to the patch tracking system

Acked-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof