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-rw-r--r--arch/x86/kernel/tlb_32.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/kernel/tlb_32.c b/arch/x86/kernel/tlb_32.c
index ec53818f4e38..d37bbfcb813d 100644
--- a/arch/x86/kernel/tlb_32.c
+++ b/arch/x86/kernel/tlb_32.c
@@ -125,9 +125,8 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va)
{
/*
- * - mask must exist :)
+ * mm must exist :)
*/
- BUG_ON(cpumask_empty(cpumask));
BUG_ON(!mm);
/*
@@ -138,14 +137,18 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
spin_lock(&tlbstate_lock);
cpumask_andnot(flush_cpumask, cpumask, cpumask_of(smp_processor_id()));
-#ifdef CONFIG_HOTPLUG_CPU
- /* If a CPU which we ran on has gone down, OK. */
cpumask_and(flush_cpumask, flush_cpumask, cpu_online_mask);
+
+ /*
+ * If a task whose mm mask we are looking at has descheduled and
+ * has cleared its presence from the mask, or if a CPU which we ran
+ * on has gone down then there might be no flush work left:
+ */
if (unlikely(cpumask_empty(flush_cpumask))) {
spin_unlock(&tlbstate_lock);
return;
}
-#endif
+
flush_mm = mm;
flush_va = va;