linux-kernel - Re: [PATCH 3/5] iomap: simplify iomap_init() with PAGE

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Message-ID: <ZEMH9h/cd9Cp1t+X@bombadil.infradead.org>
Date:   Fri, 21 Apr 2023 15:02:30 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     axboe@...nel.dk, agk@...hat.com, snitzer@...nel.org,
        philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
        christoph.boehmwalder@...bit.com, hch@...radead.org,
        djwong@...nel.org, minchan@...nel.org, senozhatsky@...omium.org,
        patches@...ts.linux.dev, linux-block@...r.kernel.org,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, dm-devel@...hat.com,
        drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org,
        hare@...e.de, p.raghav@...sung.com, da.gomez@...sung.com,
        kbusch@...nel.org
Subject: Re: [PATCH 3/5] iomap: simplify iomap_init() with PAGE_SECTORS

On Fri, Apr 21, 2023 at 09:14:00PM +0100, Matthew Wilcox wrote:
> On Fri, Apr 21, 2023 at 12:58:05PM -0700, Luis Chamberlain wrote:
> > Just use the PAGE_SECTORS generic define. This produces no functional
> > changes. While at it use left shift to simplify this even further.
> 
> How is FOO << 2 simpler than FOO * 4?
> 
> > -	return bioset_init(&iomap_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE),
> > +	return bioset_init(&iomap_ioend_bioset, PAGE_SECTORS << 2,

We could just do:


-	return bioset_init(&iomap_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE),
+	return bioset_init(&iomap_ioend_bioset, 4 * PAGE_SECTORS,

The shift just seemed optimal if we're just going to change it.

  Luis