linux-kernel - Re: [PATCH 02/10] drivers/base: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC

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Date:   Mon, 11 Apr 2022 17:57:08 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 02/10] drivers/base: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN

On Wed, Apr 6, 2022 at 2:30 PM Catalin Marinas <catalin.marinas@....com> wrote:
>
> ARCH_DMA_MINALIGN represents the minimum (static) alignment for safe DMA
> operations while ARCH_KMALLOC_MINALIGN is the minimum kmalloc() objects
> alignment.

...

> -        * Thus we use ARCH_KMALLOC_MINALIGN here and get exactly the same
> +        * Thus we use ARCH_DMA_MINALIGN here and get at least the same
>          * buffer alignment as if it was allocated by plain kmalloc().

But then it becomes not true either, because the kmalloc() has other
alignment constraints.

-- 
With Best Regards,
Andy Shevchenko