[S390] Add is_32bit_task() helper function

Helper function which tells us if a task is running in ESA mode.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index ebc77091466f..ad1382f7932e 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -118,6 +118,12 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SINGLE_STEP        (1<<TIF_FREEZE)
 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 
+#ifdef CONFIG_64BIT
+#define is_32bit_task()         (test_thread_flag(TIF_31BIT))
+#else
+#define is_32bit_task()         (1)
+#endif
+
 #endif /* __KERNEL__ */
 
 #define PREEMPT_ACTIVE          0x4000000