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Date:   Mon, 24 Sep 2018 21:10:43 -0700
From:   Bart Van Assche <>
To:     Matthew Wilcox <>,
        Ming Lei <>
Cc:     Andrey Ryabinin <>,
        Vitaly Kuznetsov <>,
        Christoph Hellwig <>,
        Ming Lei <>,
        linux-block <>,
        linux-mm <>,
        Linux FS Devel <>,
        "open list:XFS FILESYSTEM" <>,
        Dave Chinner <>,
        Linux Kernel Mailing List <>,
        Jens Axboe <>, Christoph Lameter <>,
        Linus Torvalds <>,
        Greg Kroah-Hartman <>
Subject: Re: block: DMA alignment of IO buffer allocated from slab

On 9/24/18 8:28 PM, Matthew Wilcox wrote:
> [ ... ] Because if we have to
> round all allocations below 64 bytes up to 64 bytes, [ ... ]
Have you noticed that in another e-mail in this thread it has been 
explained why it is not necessary on x86 to align buffers allocated by 
kmalloc() on a 64-byte boundary even if these buffers are used for DMA?


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