On Wed, Oct 19, 2016 at 07:28:13PM +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.rutland@xxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Andy Lutomirski <luto@xxxxxxxxxx> > Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > Cc: Kees Cook <keescook@xxxxxxxxxxxx> > --- > include/linux/thread_info.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h > index c75c6ab..ef1f4b0 100644 > --- a/include/linux/thread_info.h > +++ b/include/linux/thread_info.h > @@ -12,6 +12,7 @@ > #include <linux/restart_block.h> > > #ifdef CONFIG_THREAD_INFO_IN_TASK > +#include <asm/current.h> > #define current_thread_info() ((struct thread_info *)current) > #endif FWIW: Acked-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
