vm: make stack guard page errors return VM_FAULT_SIGSEGV rather than SIGBUS

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index 6f0c24438bbaaf6ffdaa4f840ab8da37cf9e236a..a88c12f2235de8768bdd29063d7175510f03b45f 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -103,7 +103,7 @@ void putback_movable_pages(struct list_head *l)
                list_del(&page->lru);
                dec_zone_page_state(page, NR_ISOLATED_ANON +
                                page_is_file_cache(page));
-               if (unlikely(balloon_page_movable(page)))
+               if (unlikely(isolated_balloon_page(page)))
                        balloon_page_putback(page);
                else
                        putback_lru_page(page);
@@ -1710,12 +1710,13 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
                unlock_page(new_page);
                put_page(new_page);             /* Free it */
 
-               unlock_page(page);
+               /* Retake the callers reference and putback on LRU */
+               get_page(page);
                putback_lru_page(page);
+               mod_zone_page_state(page_zone(page),
+                        NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
 
-               count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
-               isolated = 0;
-               goto out;
+               goto out_unlock;
        }
 
        /*
@@ -1732,9 +1733,9 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
        entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
        entry = pmd_mkhuge(entry);
 
-       page_add_new_anon_rmap(new_page, vma, haddr);
-
+       pmdp_clear_flush(vma, haddr, pmd);
        set_pmd_at(mm, haddr, pmd, entry);
+       page_add_new_anon_rmap(new_page, vma, haddr);
        update_mmu_cache_pmd(vma, address, &entry);
        page_remove_rmap(page);
        /*
@@ -1753,7 +1754,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
        count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
        count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);
 
-out:
        mod_zone_page_state(page_zone(page),
                        NR_ISOLATED_ANON + page_lru,
                        -HPAGE_PMD_NR);
@@ -1762,6 +1762,11 @@ out:
 out_fail:
        count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
 out_dropref:
+       entry = pmd_mknonnuma(entry);
+       set_pmd_at(mm, haddr, pmd, entry);
+       update_mmu_cache_pmd(vma, address, &entry);
+
+out_unlock:
        unlock_page(page);
        put_page(page);
        return 0;