arm64: mm: don't bother invalidating the icache in switch_mm

We don't support software broadcast of cache maintenance operations, so
this flush is not required (__sync_icache_dcache will always affect all
CPUs).

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 737c16dffc458e58ee7840556d43b874cb8e16a0)
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index e2bc385adb6b9b3ebb941702be4ea378586413c8..a9eee33dfa62dc031ab8262c275eba79f8609bac 100644 (file)
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -151,12 +151,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 {
        unsigned int cpu = smp_processor_id();
 
-#ifdef CONFIG_SMP
-       /* check for possible thread migration */
-       if (!cpumask_empty(mm_cpumask(next)) &&
-           !cpumask_test_cpu(cpu, mm_cpumask(next)))
-               __flush_icache_all();
-#endif
        if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next)
                check_and_switch_context(next, tsk);
 }