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| author | Ingo Molnar <mingo@elte.hu> | 2008-06-16 11:20:37 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-16 11:20:37 +0200 |
| commit | 3557b18fcbe0e29706214f3c7cc680a7823605eb (patch) | |
| tree | 2a70696b78a9e8b5ba38090901301931d395ecfb /arch/x86/kernel/process_64.c | |
| parent | 4226ab93d8ae3fd895abe45879fe34d489a98718 (diff) | |
| parent | 066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff) | |
Merge branch 'linus' into x86/ptemask
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index e2319f39988..ac54ff56df8 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -658,8 +658,11 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) /* 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 + * + * tsk_used_math() checks prevent calling math_state_restore(), + * which can sleep in the case of !tsk_used_math() */ - if (next_p->fpu_counter>5) + if (tsk_used_math(next_p) && next_p->fpu_counter > 5) math_state_restore(); return prev_p; } |