On Mon, Oct 17, 2016 at 03:48:13PM +0100, Mark Rutland wrote:
> On Fri, Oct 14, 2016 at 11:42:25AM +0100, Mark Rutland wrote:
> > When CONFIG_THREAD_INFO_IN_TASK is selected, the current_thread_info()
> > macro relies on current having been defined prior to its use. However,
> > not all users of current_thread_info() include <asm/current.h>, and thus
> > current is not guaranteed to be defined.
> > When CONFIG_THREAD_INFO_IN_TASK is not selected, it's possible that
> > get_current() / current are based upon current_thread_info(), and
> > <asm/current.h> includes <asm/thread_info.h>. Thus always including
> > <asm/current.h> would result in circular dependences on some platforms.
> > To ensure both cases work, this patch includes <asm/current.h>, but only
> > when CONFIG_THREAD_INFO_IN_TASK is selected.
> > Signed-off-by: Mark Rutland <mark.rutl...@arm.com>
> > ---
> > include/linux/thread_info.h | 1 +
> > 1 file changed, 1 insertion(+)
> > As discussed, it would be great if this could go in along with the patch to
> > make thread_info arch-specific again, to make merging the arch-specific
> > parts
> > easier (for arm64 and s390).
> Urrgh; I've just recalled that this patch alone is insufficient. The
> h8300 arch code has an unfixed bug , and relies on some implicit
> definition ordering that will be broken by this patch.
> I have a workaround/cleanup for core code that I'll send with an updated
> version of my arm64 series shortly.
Looks like I spoke too soon. I have another circular include issue with
raw_smp_processor_id() and task_struct::cpu to solve -- it looks like
s390 doesn't suffer from that per my reading of your headers.
In the mean time, I've pushed out a branch  with the common patches,
atop of v4.9-rc1.