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> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Andy Lutomirski <l...@kernel.org> Cc: Heiko Carstens <heiko.carst...@de.ibm.com> Cc: Kees Cook <keesc...@chromium.org> --- 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 -- 1.9.1
