linux-kernel - Re: [PATCH] lib/genaloc: Fix allocation of aligned buffer from non-aligned chunk

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Date:   Thu, 8 Nov 2018 10:58:20 +0200
From:   Alexey Skidanov <alexey.skidanov@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     sbates@...thlin.com, logang@...tatee.com, danielmentz@...gle.com,
        mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org,
        labbott@...hat.com
Subject: Re: [PATCH] lib/genaloc: Fix allocation of aligned buffer from
 non-aligned chunk



On 11/8/18 00:14, Andrew Morton wrote:
> On Wed, 7 Nov 2018 08:21:07 +0200 Alexey Skidanov <alexey.skidanov@...el.com> wrote:
> 
>>> Why does this need "fixing"?  Are there current callers which can
>>> misalign chunk_start_addr?  Or is there a requirement that future
>>> callers can misalign chunk_start_addr?
>>>
>> I work on adding aligned allocation support for ION heaps
>> (https://www.spinics.net/lists/linux-driver-devel/msg118754.html). Two
>> of these heaps use genpool internally.
>>
>> If you want to have an ability to allocate buffers aligned on different
>> boundaries (for example, 4K, 1MB, ...), this fix actually removes the
>> requirement for chunk_start_addr to be aligned on the max possible
>> alignment.
> 
> OK.  This sort of information should be in the changelog, please.  In
> much detail.
> 
Sure, I'll add this information and resend the patch.

Thanks,
Alexey