linux-kernel - Re: [PATCH v2 06/10] mm/swap: use npage_to_sectors() and PAGE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 14 May 2020 21:14:56 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jens Axboe <axboe@...nel.dk>, Coly Li <colyli@...e.de>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        linux-block <linux-block@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>, 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 v2 06/10] mm/swap: use npage_to_sectors() and
 PAGE_SECTORS to clean up code

On Thu, May 07, 2020 at 03:50:56PM +0800, Zhen Lei wrote:
> +++ b/mm/page_io.c
> @@ -38,7 +38,7 @@ static struct bio *get_swap_bio(gfp_t gfp_flags,
>  
>  		bio->bi_iter.bi_sector = map_swap_page(page, &bdev);
>  		bio_set_dev(bio, bdev);
> -		bio->bi_iter.bi_sector <<= PAGE_SHIFT - 9;
> +		bio->bi_iter.bi_sector *= PAGE_SECTORS;
>  		bio->bi_end_io = end_io;

This just doesn't look right.  Why is map_swap_page() returning a sector_t
which isn't actually a sector_t?