[ARM] 5092/1: Fix the I-cache invalidation on ARMv6 and later CPUs

This patch adds the I-cache invalidation in update_mmu_cache if the
corresponding vma is marked as executable. It also invalidates the
I-cache if a thread migrates to a CPU it never ran on.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-arm/mmu_context.h b/include/asm-arm/mmu_context.h
index 6913d02ca5d6..91b9dfdfed52 100644
--- a/include/asm-arm/mmu_context.h
+++ b/include/asm-arm/mmu_context.h
@@ -97,6 +97,11 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 #ifdef CONFIG_MMU
         unsigned int cpu = smp_processor_id();
 
+#ifdef CONFIG_SMP
+        /* check for possible thread migration */
+        if (!cpus_empty(next->cpu_vm_mask) && !cpu_isset(cpu, next->cpu_vm_mask))
+                __flush_icache_all();
+#endif
         if (!cpu_test_and_set(cpu, next->cpu_vm_mask) || prev != next) {
                 check_context(next);
                 cpu_switch_mm(next->pgd, next);