linux-kernel - Re: [PATCH v2] mm: make minimum slab alignment a runtime property

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Message-ID: <YmLt0s/KdSJlSSPk@arm.com>
Date:   Fri, 22 Apr 2022 19:02:58 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Peter Collingbourne <pcc@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        vbabka@...e.cz, penberg@...nel.org, roman.gushchin@...ux.dev,
        iamjoonsoo.kim@....com, rientjes@...gle.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2] mm: make minimum slab alignment a runtime property

On Thu, Apr 21, 2022 at 02:15:48PM -0700, Peter Collingbourne wrote:
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 373b3ef99f4e..80e517593372 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -201,21 +201,33 @@ void kmem_dump_obj(void *object);
>  #endif
>  
>  /*
> - * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
> + * Setting ARCH_SLAB_MIN_MINALIGN in arch headers allows a different alignment.
>   * Intended for arches that get misalignment faults even for 64 bit integer
>   * aligned buffers.
>   */
> -#ifndef ARCH_SLAB_MINALIGN
> -#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
> +#ifndef ARCH_SLAB_MIN_MINALIGN
> +#define ARCH_SLAB_MIN_MINALIGN __alignof__(unsigned long long)
> +#endif

Sorry, only a drive-by comment, I'll look at the arm64 parts next week.
I've seen it mentioned in the first version, what's the point of MIN_MIN
and not just MIN?

-- 
Catalin