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[S390] remove superfluous TIF_USEDFPU bit

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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>
This commit is contained in:
Martin Schwidefsky 2010-01-13 20:44:28 +01:00 committed by Martin Schwidefsky
parent 6f50248ef0
commit bebf023d41
3 changed files with 5 additions and 15 deletions
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12
arch/s390/include/asm/thread_info.h
View File

@ -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)

2
arch/s390/kernel/process.c
View File

@ -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)

6
arch/s390/kernel/setup.c
View File

@ -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);