Re: [PATCH] btrfs: fix size_t format string

[Arnd Bergmann]

On Tue, Jul 17, 2018 at 4:33 PM, Qu Wenruo <quwenruo.btrfs@xxxxxxx> wrote:
>
>
> On 2018å07æ17æ 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=format=]
>>
>> 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