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Date: Tue, 5 May 2020 18:32:36 +0100
From: antlists <antlists@...ngman.org.uk>
To: Zhen Lei <thunder.leizhen@...wei.com>,
Minchan Kim <minchan@...nel.org>,
Nitin Gupta <ngupta@...are.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Jens Axboe <axboe@...nel.dk>,
linux-block <linux-block@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>, Alasdair Kergon <agk@...hat.com>,
Mike Snitzer <snitzer@...hat.com>,
dm-devel <dm-devel@...hat.com>, Song Liu <song@...nel.org>,
linux-raid <linux-raid@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] eliminate SECTOR related magic numbers and duplicated
conversions
On 05/05/2020 12:55, Zhen Lei wrote:
> When I studied the code of mm/swap, I found "1 << (PAGE_SHIFT - 9)" appears
> many times. So I try to clean up it.
>
> 1. Replace "1 << (PAGE_SHIFT - 9)" or similar with SECTORS_PER_PAGE
> 2. Replace "PAGE_SHIFT - 9" with SECTORS_PER_PAGE_SHIFT
> 3. Replace "9" with SECTOR_SHIFT
> 4. Replace "512" with SECTOR_SIZE
Naive question - what is happening about 4096-byte sectors? Do we need
to forward-plan?
Cheers,
Wol
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