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author | Paul Mundt <lethal@linux-sh.org> | 2009-12-08 15:47:12 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2009-12-08 15:47:12 +0900 |
commit | 6424db52e24e8cdf89917fa3c10395116440160e (patch) | |
tree | bd923d78f90addb080abc82f3bff6ca5c9bf10b4 /arch/sh/kernel/process_32.c | |
parent | 09a072947791088b88ae15111cf68fc5aaaf758d (diff) | |
parent | 6a5a0b9139b19dd1a107870269a35bc9cf18d2dc (diff) | |
download | linux-stable-6424db52e24e8cdf89917fa3c10395116440160e.tar.gz linux-stable-6424db52e24e8cdf89917fa3c10395116440160e.tar.bz2 linux-stable-6424db52e24e8cdf89917fa3c10395116440160e.zip |
Merge branch 'master' into sh/hw-breakpoints
Conflict between FPU thread flag migration and debug
thread flag addition.
Conflicts:
arch/sh/include/asm/thread_info.h
arch/sh/include/asm/ubc.h
arch/sh/kernel/process_32.c
Diffstat (limited to 'arch/sh/kernel/process_32.c')
-rw-r--r-- | arch/sh/kernel/process_32.c | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index 4a2c866f9773..7399d78fc8ed 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -133,7 +133,10 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) regs.regs[5] = (unsigned long)fn; regs.pc = (unsigned long)kernel_thread_helper; - regs.sr = (1 << 30); + regs.sr = SR_MD; +#if defined(CONFIG_SH_FPU) + regs.sr |= SR_FD; +#endif /* Ok, create the new process.. */ pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, @@ -141,6 +144,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) return pid; } +EXPORT_SYMBOL(kernel_thread); /* * Free current thread data structures etc.. @@ -184,6 +188,16 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) return fpvalid; } +EXPORT_SYMBOL(dump_fpu); + +/* + * This gets called before we allocate a new thread and copy + * the current task into it. + */ +void prepare_to_copy(struct task_struct *tsk) +{ + unlazy_fpu(tsk, task_pt_regs(tsk)); +} asmlinkage void ret_from_fork(void); @@ -193,15 +207,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, { struct thread_info *ti = task_thread_info(p); struct pt_regs *childregs; - struct task_struct *tsk = current; - -#if defined(CONFIG_SH_FPU) - unlazy_fpu(tsk, regs); - p->thread.fpu = tsk->thread.fpu; - copy_to_stopped_child_used_math(p); -#endif #if defined(CONFIG_SH_DSP) + struct task_struct *tsk = current; + if (is_dsp_enabled(tsk)) { /* We can use the __save_dsp or just copy the struct: * __save_dsp(p); @@ -220,6 +229,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, } else { childregs->regs[15] = (unsigned long)childregs; ti->addr_limit = KERNEL_DS; + ti->status &= ~TS_USEDFPU; + p->fpu_counter = 0; } if (clone_flags & CLONE_SETTLS) @@ -242,9 +253,13 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, __notrace_funcgraph struct task_struct * __switch_to(struct task_struct *prev, struct task_struct *next) { -#if defined(CONFIG_SH_FPU) + struct thread_struct *next_t = &next->thread; + unlazy_fpu(prev, task_pt_regs(prev)); -#endif + + /* we're going to use this soon, after a few expensive things */ + if (next->fpu_counter > 5) + prefetch(&next_t->fpu.hard); #ifdef CONFIG_MMU /* @@ -256,6 +271,14 @@ __switch_to(struct task_struct *prev, struct task_struct *next) : "r" (task_thread_info(next))); #endif + /* + * 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)); + return prev; } |