x86: don't call '->send_IPI_mask()' with an empty mask

[pandora-kernel.git] / arch / x86 / mm / tlb.c

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 821e970..c814e14 100644 (file)
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -183,18 +183,17 @@ static void flush_tlb_others_ipi(const struct cpumask *cpumask,
 
        f->flush_mm = mm;
        f->flush_va = va;
-       cpumask_andnot(to_cpumask(f->flush_cpumask),
-                      cpumask, cpumask_of(smp_processor_id()));
-
-       /*
-        * We have to send the IPI only to
-        * CPUs affected.
-        */
-       apic->send_IPI_mask(to_cpumask(f->flush_cpumask),
-                     INVALIDATE_TLB_VECTOR_START + sender);
+       if (cpumask_andnot(to_cpumask(f->flush_cpumask), cpumask, cpumask_of(smp_processor_id()))) {
+               /*
+                * We have to send the IPI only to
+                * CPUs affected.
+                */
+               apic->send_IPI_mask(to_cpumask(f->flush_cpumask),
+                             INVALIDATE_TLB_VECTOR_START + sender);
 
-       while (!cpumask_empty(to_cpumask(f->flush_cpumask)))
-               cpu_relax();
+               while (!cpumask_empty(to_cpumask(f->flush_cpumask)))
+                       cpu_relax();
+       }
 
        f->flush_mm = NULL;
        f->flush_va = 0;