Re: [GIT PULL] Btrfs

[Josh Boyer <jwboyer@fedoraproject.org>]

On Fri, Sep 13, 2013 at 2:44 AM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Thu, Sep 12, 2013 at 10:38 PM, Josh Boyer <jwboyer@fedoraproject.org> wrote:
>> On Thu, Sep 12, 2013 at 11:36 AM, Chris Mason <chris.mason@fusionio.com> wrote:
>>> Mark Fasheh (4):
>>>       btrfs: offline dedupe
>>
>> This commit adds calls to __put_user_unaligned, which causes build
>> failures on ARM if btrfs is configured:
>>
>> + make -s ARCH=arm V=1 -j4 modules
>> fs/btrfs/ioctl.c: In function 'btrfs_ioctl_file_extent_same':
>> fs/btrfs/ioctl.c:2802:3: error: implicit declaration of function
>> '__put_user_unaligned' [-Werror=implicit-function-declaration]
>>    if (__put_user_unaligned(info.status, &args->info[i].status) ||
>>    ^
>> cc1: some warnings being treated as errors
>> make[2]: *** [fs/btrfs/ioctl.o] Error 1
>> make[1]: *** [fs/btrfs] Error 2
>> make[1]: *** Waiting for unfinished jobs....
>> make: *** [fs] Error 2
>> make: *** Waiting for unfinished jobs....
>
> Cfr. my early warning 10 days ago:
>
> "Btrfs is the first user of __put_user_unaligned() outside the compat code,
> hence now all 32-bit architectures should make sure to implement this, too."
>
> http://marc.info/?l=linux-arch&m=137820065929216&w=2

Indeed.  I missed that as it was an m68k patch.

I'm not an ARM expert, so I don't know if ARM should use the
asm-generic implementations, or just use __get_user/__put_user in all
cases.  I've CC'd rmk.

josh