linux-kernel - Re: block: DMA alignment of IO buffer allocated from slab

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Message-ID: <20180920063129.GB12913@lst.de>
Date:   Thu, 20 Sep 2018 08:31:29 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     linux-block <linux-block@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        "open list:XFS FILESYSTEM" <linux-xfs@...r.kernel.org>,
        Dave Chinner <dchinner@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Ming Lei <ming.lei@...hat.com>
Subject: Re: block: DMA alignment of IO buffer allocated from slab

On Wed, Sep 19, 2018 at 05:15:43PM +0800, Ming Lei wrote:
> 1) does kmalloc-N slab guarantee to return N-byte aligned buffer?  If
> yes, is it a stable rule?

This is the assumption in a lot of the kernel, so I think if somethings
breaks this we are in a lot of pain.