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

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Message-Id: <20181107141428.bd1f8b1a989449633394d8c1@linux-foundation.org>
Date:   Wed, 7 Nov 2018 14:14:28 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Alexey Skidanov <alexey.skidanov@...el.com>
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 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.