037f0eed57
In the current kernel, the function flush_fp_to_thread() is not dependent on CONFIG_PPC_FPU. So most invocations of this function is not wrapped by CONFIG_PPC_FPU. Even through we don't really save the FPRs to the thread struct if CONFIG_PPC_FPU is not enabled, but there does have some runtime overhead such as the check for tsk->thread.regs and preempt disable and enable. It really make no sense to do that. So make it a nop when CONFIG_PPC_FPU is disabled. Also remove the wrapped #ifdef CONFIG_PPC_FPU when invoking this function. Signed-off-by: Kevin Hao <haokexin@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
|
|
*/
|
|
#ifndef _ASM_POWERPC_SWITCH_TO_H
|
|
#define _ASM_POWERPC_SWITCH_TO_H
|
|
|
|
struct thread_struct;
|
|
struct task_struct;
|
|
struct pt_regs;
|
|
|
|
extern struct task_struct *__switch_to(struct task_struct *,
|
|
struct task_struct *);
|
|
#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
|
|
|
|
struct thread_struct;
|
|
extern struct task_struct *_switch(struct thread_struct *prev,
|
|
struct thread_struct *next);
|
|
|
|
extern void giveup_fpu(struct task_struct *);
|
|
extern void load_up_fpu(void);
|
|
extern void enable_kernel_fp(void);
|
|
extern void enable_kernel_altivec(void);
|
|
extern void load_up_altivec(struct task_struct *);
|
|
extern int emulate_altivec(struct pt_regs *);
|
|
extern void __giveup_vsx(struct task_struct *);
|
|
extern void giveup_vsx(struct task_struct *);
|
|
extern void enable_kernel_spe(void);
|
|
extern void giveup_spe(struct task_struct *);
|
|
extern void load_up_spe(struct task_struct *);
|
|
|
|
#ifndef CONFIG_SMP
|
|
extern void discard_lazy_cpu_state(void);
|
|
#else
|
|
static inline void discard_lazy_cpu_state(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_FPU
|
|
extern void flush_fp_to_thread(struct task_struct *);
|
|
#else
|
|
static inline void flush_fp_to_thread(struct task_struct *t) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
extern void flush_altivec_to_thread(struct task_struct *);
|
|
extern void giveup_altivec(struct task_struct *);
|
|
extern void giveup_altivec_notask(void);
|
|
#else
|
|
static inline void flush_altivec_to_thread(struct task_struct *t)
|
|
{
|
|
}
|
|
static inline void giveup_altivec(struct task_struct *t)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_VSX
|
|
extern void flush_vsx_to_thread(struct task_struct *);
|
|
#else
|
|
static inline void flush_vsx_to_thread(struct task_struct *t)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SPE
|
|
extern void flush_spe_to_thread(struct task_struct *);
|
|
#else
|
|
static inline void flush_spe_to_thread(struct task_struct *t)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline void clear_task_ebb(struct task_struct *t)
|
|
{
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
/* EBB perf events are not inherited, so clear all EBB state. */
|
|
t->thread.bescr = 0;
|
|
t->thread.mmcr2 = 0;
|
|
t->thread.mmcr0 = 0;
|
|
t->thread.siar = 0;
|
|
t->thread.sdar = 0;
|
|
t->thread.sier = 0;
|
|
t->thread.used_ebb = 0;
|
|
#endif
|
|
}
|
|
|
|
#endif /* _ASM_POWERPC_SWITCH_TO_H */
|