1 files changed, 17 insertions, 15 deletions

diff --git a/arch/ppc/mm/fault.c b/arch/ppc/mm/fault.c
index ee5e9f25baf9..8e08ca32531a 100644
--- a/arch/ppc/mm/fault.c
+++ b/arch/ppc/mm/fault.c
@@ -1,6 +1,4 @@
 /*
- *  arch/ppc/mm/fault.c
- *
  *  PowerPC version
  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  *
@@ -204,6 +202,7 @@ good_area:
         /* an exec  - 4xx/Book-E allows for per-page execute permission */
         } else if (TRAP(regs) == 0x400) {
                 pte_t *ptep;
+                pmd_t *pmdp;
 
 #if 0
                 /* It would be nice to actually enforce the VM execute
@@ -217,21 +216,24 @@ good_area:
                 /* Since 4xx/Book-E supports per-page execute permission,
                  * we lazily flush dcache to icache. */
                 ptep = NULL;
-                if (get_pteptr(mm, address, &ptep) && pte_present(*ptep)) {
-                        struct page *page = pte_page(*ptep);
-
-                        if (! test_bit(PG_arch_1, &page->flags)) {
-                                flush_dcache_icache_page(page);
-                                set_bit(PG_arch_1, &page->flags);
+                if (get_pteptr(mm, address, &ptep, &pmdp)) {
+                        spinlock_t *ptl = pte_lockptr(mm, pmdp);
+                        spin_lock(ptl);
+                        if (pte_present(*ptep)) {
+                                struct page *page = pte_page(*ptep);
+
+                                if (!test_bit(PG_arch_1, &page->flags)) {
+                                        flush_dcache_icache_page(page);
+                                        set_bit(PG_arch_1, &page->flags);
+                                }
+                                pte_update(ptep, 0, _PAGE_HWEXEC);
+                                _tlbie(address);
+                                pte_unmap_unlock(ptep, ptl);
+                                up_read(&mm->mmap_sem);
+                                return 0;
                         }
-                        pte_update(ptep, 0, _PAGE_HWEXEC);
-                        _tlbie(address);
-                        pte_unmap(ptep);
-                        up_read(&mm->mmap_sem);
-                        return 0;
+                        pte_unmap_unlock(ptep, ptl);
                 }
-                if (ptep != NULL)
-                        pte_unmap(ptep);
 #endif
         /* a read */
         } else {