diff options
Diffstat (limited to 'arch/x86_64/kernel/process.c')
| -rw-r--r-- | arch/x86_64/kernel/process.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 22a05dec81a2..81111835722d 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -114,7 +114,7 @@ void exit_idle(void) * We use this if we don't have any better * idle routine.. */ -void default_idle(void) +static void default_idle(void) { local_irq_enable(); @@ -508,7 +508,7 @@ out: /* * This special macro can be used to load a debugging register */ -#define loaddebug(thread,r) set_debug(thread->debugreg ## r, r) +#define loaddebug(thread,r) set_debugreg(thread->debugreg ## r, r) /* * switch_to(x,y) should switch tasks from x to y. @@ -527,8 +527,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) int cpu = smp_processor_id(); struct tss_struct *tss = &per_cpu(init_tss, cpu); - unlazy_fpu(prev_p); - /* * Reload esp0, LDT and the page table pointer: */ @@ -586,11 +584,14 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) } /* - * Switch the PDA context. + * Switch the PDA and FPU contexts. */ prev->userrsp = read_pda(oldrsp); write_pda(oldrsp, next->userrsp); write_pda(pcurrent, next_p); + /* This must be here to ensure both math_state_restore() and + kernel_fpu_begin() work consistently. */ + unlazy_fpu(prev_p); write_pda(kernelstack, task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET); |