On 06/28/2017 02:04 AM, Stephen Rothwell wrote:

Hi Jens,

After merging the block tree, today's linux-next build (powerpc
allnoconfig) failed like this:

fs/fcntl.o: In function `do_fcntl': 
fcntl.c:(.text+0x6d4): undefined reference to `__get_user_bad'
fcntl.c:(.text+0x730): undefined reference to `__get_user_bad'

Probably caused by commit

  c75b1d9421f8 ("fs: add fcntl() interface for setting/getting write life time hints")

On powerpc (at least) you cannot use get_user() to fetch anything larger
than "unsigned long" i.e. 32 bits on 32 bit powerpc.

This has been discussed before (and, I think, a fix attempted).

Gah, thanks for letting me know. I'll test your patch and queue it
up to fix this issue.

-- 
Jens Axboe