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x86: PEBS cleanup

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-05-17 08:30:07 +02:00
committed by Thomas Gleixner
parent 573da4224e
commit 34b2cd5b68
1 changed files with 16 additions and 11 deletions
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27
arch/x86/kernel/process_64.c
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@ -500,7 +500,6 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
{
struct thread_struct *prev, *next;
unsigned long debugctl;
unsigned long ds_prev = 0, ds_next = 0;
prev = &prev_p->thread,
next = &next_p->thread;
@ -508,17 +507,23 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
debugctl = prev->debugctlmsr;
#ifdef CONFIG_X86_DS
if (prev->ds_ctx)
ds_prev = (unsigned long)prev->ds_ctx->ds;
if (next->ds_ctx)
ds_next = (unsigned long)next->ds_ctx->ds;
{
unsigned long ds_prev = 0, ds_next = 0;
if (ds_next != ds_prev) {
/* we clear debugctl to make sure DS
* is not in use when we change it */
debugctl = 0;
update_debugctlmsr(0);
wrmsrl(MSR_IA32_DS_AREA, ds_next);
if (prev->ds_ctx)
ds_prev = (unsigned long)prev->ds_ctx->ds;
if (next->ds_ctx)
ds_next = (unsigned long)next->ds_ctx->ds;
if (ds_next != ds_prev) {
/*
* We clear debugctl to make sure DS
* is not in use when we change it:
*/
debugctl = 0;
update_debugctlmsr(0);
wrmsrl(MSR_IA32_DS_AREA, ds_next);
}
}
#endif /* CONFIG_X86_DS */