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Commit bebf023d authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Martin Schwidefsky
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[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6f50248e

arch/s390/include/asm/thread_info.h

+5 −7
Original line number Diff line number Diff line
@@ -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)

arch/s390/kernel/process.c

+0 −2
Original line number Diff line number Diff line
@@ -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)

arch/s390/kernel/setup.c

+0 −6
Original line number Diff line number Diff line
@@ -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);