Merge remote-tracking branch 'linus/master' into testing

1 files changed, 2 insertions, 33 deletions

diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
index 9a52a07aa40..c2edfff573c 100644
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -70,23 +70,6 @@ static inline void ipi_flush_bp_all(void *ignored)
 	local_flush_bp_all();
 }
 
-#ifdef CONFIG_ARM_ERRATA_798181
-static int erratum_a15_798181(void)
-{
-	unsigned int midr = read_cpuid_id();
-
-	/* Cortex-A15 r0p0..r3p2 affected */
-	if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2)
-		return 0;
-	return 1;
-}
-#else
-static int erratum_a15_798181(void)
-{
-	return 0;
-}
-#endif
-
 static void ipi_flush_tlb_a15_erratum(void *arg)
 {
 	dmb();
@@ -103,7 +86,7 @@ static void broadcast_tlb_a15_erratum(void)
 
 static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
 {
-	int cpu, this_cpu;
+	int this_cpu;
 	cpumask_t mask = { CPU_BITS_NONE };
 
 	if (!erratum_a15_798181())
@@ -111,21 +94,7 @@ static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm)
 
 	dummy_flush_tlb_a15_erratum();
 	this_cpu = get_cpu();
-	for_each_online_cpu(cpu) {
-		if (cpu == this_cpu)
-			continue;
-		/*
-		 * We only need to send an IPI if the other CPUs are running
-		 * the same ASID as the one being invalidated. There is no
-		 * need for locking around the active_asids check since the
-		 * switch_mm() function has at least one dmb() (as required by
-		 * this workaround) in case a context switch happens on
-		 * another CPU after the condition below.
-		 */
-		if (atomic64_read(&mm->context.id) ==
-		    atomic64_read(&per_cpu(active_asids, cpu)))
-			cpumask_set_cpu(cpu, &mask);
-	}
+	a15_erratum_get_cpumask(this_cpu, mm, &mask);
 	smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1);
 	put_cpu();
 }