Hi Benjamin,

On Tue, 12 Jan 2016 11:38:35 -0500 Benjamin LaHaise [off-list ref] wrote:

On Tue, Jan 12, 2016 at 04:40:34PM +1100, Stephen Rothwell wrote:

quoted

After merging the aio tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

fs/built-in.o: In function `aio_thread_op_foo_at':
file.c:(.text+0x43808): undefined reference to `__get_user_bad'
file.c:(.text+0x43838): undefined reference to `__get_user_bad'  

This is very strange.  It seems to imply that __get_user() doesn't 
handle 64 bit values, which is completely broken behaviour on the 
architecture's part if true.  Can any ARM folks comment on the right 
fix here?

Well, probably only if you cc them :-)

Indeed, __get_user on arm does not handle 64 bit objects, where as
get_user does ...

Background: new aio code is adding __get_user() calls referencing 64
bit quantities (__u64 and __s64).

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au