[MIPS] Do not use drop_mmu_context to flusing other task's VIPT I-cache.

c-r4k.c and c-sb1.c use drop_mmu_context() to flush virtually tagged
I-caches, but this does not work for flushing other task's icache.  This
is for example triggered by copy_to_user_page() called from ptrace(2).
Use indexed flush for such cases.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 4e1498246343..2d729f6f6348 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -475,7 +475,7 @@ static inline void local_r4k_flush_cache_page(void *args)
                 }
         }
         if (exec) {
-                if (cpu_has_vtag_icache) {
+                if (cpu_has_vtag_icache && mm == current->active_mm) {
                         int cpu = smp_processor_id();
 
                         if (cpu_context(cpu, mm) != 0)
@@ -599,7 +599,7 @@ static inline void local_r4k_flush_icache_page(void *args)
          * We're not sure of the virtual address(es) involved here, so
          * we have to flush the entire I-cache.
          */
-        if (cpu_has_vtag_icache) {
+        if (cpu_has_vtag_icache && vma->vm_mm == current->active_mm) {
                 int cpu = smp_processor_id();
 
                 if (cpu_context(cpu, vma->vm_mm) != 0)