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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Tue, 17 Jul 2018 18:02:31 +0200
Message-ID: <CAK8P3a17Mik-J-PzjP2g7OzX-0ozTGnRxfw8tB4c+pKiRWoEaA@mail.gmail.com>
Subject: Re: [PATCH] btrfs: fix size_t format string
To:     Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc:     Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>,
        David Sterba <dsterba@suse.com>, Qu Wenruo <wqu@suse.com>,
        Nikolay Borisov <nborisov@suse.com>,
        Su Yue <suy.fnst@cn.fujitsu.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, Jul 17, 2018 at 4:33 PM, Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
>
>
> On 2018=E5=B9=B407=E6=9C=8817=E6=97=A5 21:52, Arnd Bergmann wrote:
>> The newly added check_block_group_item() function causes a build warning
>> on 32-bit architectures:
>>
>> fs/btrfs/tree-checker.c: In function 'check_block_group_item':
>> fs/btrfs/tree-checker.c:404:41: error: format '%lu' expects argument of =
type 'long unsigned int', but argument 6 has type 'unsigned int' [-Werror=
=3Dformat=3D]
>>
>> The type of a sizeof() expression is size_t, which is correctly printed
>> using the %zu format string.
>>
>> Fixes: 9dc16aad5660 ("btrfs: tree-checker: Verify block_group_item")
>
> My fault again. :(
>
> Is there anyway to make gcc report such problem even under x86_64?

I don't think so. However, if you post a patch to the mainling list, the
0-day bot should report any build regressions within a day.

      Arnd