[S390] remove superfluous TIF_USEDFPU bit

The TIF_USEDFPU bit is always 0 for s390 and it is not tested anywhere.
Remove the bit. At the same time remove the calls to clear_used_math()
as well. The PF_USED_MATH bit is never set for s390 either.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index 07eb61b..66069e7 100644 (file)
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -93,13 +93,12 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_AUDIT      9       /* syscall auditing active */
 #define TIF_SECCOMP            10      /* secure computing */
 #define TIF_SYSCALL_TRACEPOINT 11      /* syscall tracepoint instrumentation */
-#define TIF_USEDFPU            16      /* FPU was used by this task this quantum (SMP) */
-#define TIF_POLLING_NRFLAG     17      /* true if poll_idle() is polling 
+#define TIF_POLLING_NRFLAG     16      /* true if poll_idle() is polling
                                           TIF_NEED_RESCHED */
-#define TIF_31BIT              18      /* 32bit process */ 
-#define TIF_MEMDIE             19
-#define TIF_RESTORE_SIGMASK    20      /* restore signal mask in do_signal() */
-#define TIF_FREEZE             21      /* thread is freezing for suspend */
+#define TIF_31BIT              17      /* 32bit process */
+#define TIF_MEMDIE             18
+#define TIF_RESTORE_SIGMASK    19      /* restore signal mask in do_signal() */
+#define TIF_FREEZE             20      /* thread is freezing for suspend */
 
 #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
 #define _TIF_RESTORE_SIGMASK   (1<<TIF_RESTORE_SIGMASK)
@@ -112,7 +111,6 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_AUDIT     (1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP           (1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_TRACEPOINT        (1<<TIF_SYSCALL_TRACEPOINT)
-#define _TIF_USEDFPU           (1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG    (1<<TIF_POLLING_NRFLAG)
 #define _TIF_31BIT             (1<<TIF_31BIT)
 #define _TIF_FREEZE            (1<<TIF_FREEZE)

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index b98fe8e..00b6d1d 100644 (file)
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -153,8 +153,6 @@ void exit_thread(void)
 
 void flush_thread(void)
 {
-       clear_used_math();
-       clear_tsk_thread_flag(current, TIF_USEDFPU);
 }
 
 void release_thread(struct task_struct *dead_task)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 0663287..2148ad3 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -124,12 +124,6 @@ void __cpuinit cpu_init(void)
          */
        get_cpu_id(&S390_lowcore.cpu_id);
 
-        /*
-         * Force FPU initialization:
-         */
-        clear_thread_flag(TIF_USEDFPU);
-        clear_used_math();
-
        atomic_inc(&init_mm.mm_count);
        current->active_mm = &init_mm;
        BUG_ON(current->mm);