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Diffstat (limited to 'arch/x86/mm/tlb.c')
-rw-r--r--arch/x86/mm/tlb.c29
1 files changed, 26 insertions, 3 deletions
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 8ddb5d0d66fb..8f4cc3dfac32 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -161,7 +161,10 @@ void flush_tlb_current_task(void)
preempt_disable();
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
+
+ /* This is an implicit full barrier that synchronizes with switch_mm. */
local_flush_tlb();
+
trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
@@ -188,17 +191,29 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long base_pages_to_flush = TLB_FLUSH_ALL;
preempt_disable();
- if (current->active_mm != mm)
+ if (current->active_mm != mm) {
+ /* Synchronize with switch_mm. */
+ smp_mb();
+
goto out;
+ }
if (!current->mm) {
leave_mm(smp_processor_id());
+
+ /* Synchronize with switch_mm. */
+ smp_mb();
+
goto out;
}
if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
base_pages_to_flush = (end - start) >> PAGE_SHIFT;
+ /*
+ * Both branches below are implicit full barriers (MOV to CR or
+ * INVLPG) that synchronize with switch_mm.
+ */
if (base_pages_to_flush > tlb_single_page_flush_ceiling) {
base_pages_to_flush = TLB_FLUSH_ALL;
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
@@ -228,10 +243,18 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long start)
preempt_disable();
if (current->active_mm == mm) {
- if (current->mm)
+ if (current->mm) {
+ /*
+ * Implicit full barrier (INVLPG) that synchronizes
+ * with switch_mm.
+ */
__flush_tlb_one(start);
- else
+ } else {
leave_mm(smp_processor_id());
+
+ /* Synchronize with switch_mm. */
+ smp_mb();
+ }
}
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)