linux-kernel - Re: [PATCH] Revert "md: raid1: use bio helper in process

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Date:   Tue, 28 Mar 2017 18:44:43 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Shaohua Li <shli@...nel.org>, NeilBrown <neilb@...e.com>,
        Jens Axboe <axboe@...com>, "colyli@...e.de" <colyli@...e.de>,
        Guoqing Jiang <gqjiang@...e.com>,
        Mike Christie <mchristi@...hat.com>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "md: raid1: use bio helper in process_checks()"

On Tue, Mar 28, 2017 at 5:49 PM, Arnd Bergmann <arnd@...db.de> wrote:
> Commit 60928a91b0b3 ("md: raid1: use bio helper in process_checks()")
> is probably correct, but I get a new compile-time warning after
> it, and have trouble understanding what it fixes:
>
> drivers/md/raid1.c: In function 'sync_request_write':
> drivers/md/raid1.c:2172:9: error: 'page_len$' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>      if (memcmp(page_address(ppages[j]),
>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          page_address(spages[j]),
>          ~~~~~~~~~~~~~~~~~~~~~~~~
>          page_len[j]))
>          ~~~~~~~~~~~~
> drivers/md/raid1.c:2160:7: note: 'page_len$' was declared here
>    int page_len[RESYNC_PAGES];
>        ^~~~~~~~
>
> This reverts it to resolve the warning.

Please try the following patch:

 https://lkml.org/lkml/2017/3/28/126

BTW, the compile failure is just a false positive.

Thanks,
Ming