mm: add a ptep_modify_prot transaction abstraction

[linux-2.6-omap-h63xx.git] / mm / mprotect.c

diff --git a/mm/mprotect.c b/mm/mprotect.c
index a5bf31c273757848ae7614bd9fc3c8595c493705..acfe7c8d72fcff59dec990869a5fce9d63b56e55 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -47,19 +47,17 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
                if (pte_present(oldpte)) {
                        pte_t ptent;
 
-                       /* Avoid an SMP race with hardware updated dirty/clean
-                        * bits by wiping the pte and then setting the new pte
-                        * into place.
-                        */
-                       ptent = ptep_get_and_clear(mm, addr, pte);
+                       ptent = ptep_modify_prot_start(mm, addr, pte);
                        ptent = pte_modify(ptent, newprot);
+
                        /*
                         * Avoid taking write faults for pages we know to be
                         * dirty.
                         */
                        if (dirty_accountable && pte_dirty(ptent))
                                ptent = pte_mkwrite(ptent);
-                       set_pte_at(mm, addr, pte, ptent);
+
+                       ptep_modify_prot_commit(mm, addr, pte, ptent);
 #ifdef CONFIG_MIGRATION
                } else if (!pte_file(oldpte)) {
                        swp_entry_t entry = pte_to_swp_entry(oldpte);