diff options
Diffstat (limited to 'arch/sh/kernel/process_32.c')
| -rw-r--r-- | arch/sh/kernel/process_32.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index 0673c4746be3..aff5fe02e393 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -288,8 +288,14 @@ static void ubc_set_tracing(int asid, unsigned long pc) __notrace_funcgraph struct task_struct * __switch_to(struct task_struct *prev, struct task_struct *next) { + struct thread_struct *next_t = &next->thread; + #if defined(CONFIG_SH_FPU) unlazy_fpu(prev, task_pt_regs(prev)); + + /* we're going to use this soon, after a few expensive things */ + if (next->fpu_counter > 5) + prefetch(&next_t->fpu.hard); #endif #ifdef CONFIG_MMU @@ -321,6 +327,16 @@ __switch_to(struct task_struct *prev, struct task_struct *next) #endif } +#if defined(CONFIG_SH_FPU) + /* If the task has used fpu the last 5 timeslices, just do a full + * restore of the math state immediately to avoid the trap; the + * chances of needing FPU soon are obviously high now + */ + if (next->fpu_counter > 5) { + fpu_state_restore(task_pt_regs(next)); + } +#endif + return prev; } |