mm: replace PAGE_MIGRATION with IS_ENABLED(CONFIG_MIGRATION)

Since commit 2a11c8ea20bf ("kconfig: Introduce IS_ENABLED(),
IS_BUILTIN() and IS_MODULE()") there is a generic grep-friendly method
for checking config options in C expressions.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index c8454e06b6c8..78cc46b876e6 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1282,7 +1282,7 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
                         }
                         dec_mm_counter(mm, MM_ANONPAGES);
                         inc_mm_counter(mm, MM_SWAPENTS);
-                } else if (PAGE_MIGRATION) {
+                } else if (IS_ENABLED(CONFIG_MIGRATION)) {
                         /*
                          * Store the pfn of the page in a special migration
                          * pte. do_swap_page() will wait until the migration
@@ -1293,7 +1293,8 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
                 }
                 set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
                 BUG_ON(pte_file(*pte));
-        } else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) {
+        } else if (IS_ENABLED(CONFIG_MIGRATION) &&
+                   (TTU_ACTION(flags) == TTU_MIGRATION)) {
                 /* Establish migration entry for a file page */
                 swp_entry_t entry;
                 entry = make_migration_entry(page, pte_write(pteval));
@@ -1499,7 +1500,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
                  * locking requirements of exec(), migration skips
                  * temporary VMAs until after exec() completes.
                  */
-                if (PAGE_MIGRATION && (flags & TTU_MIGRATION) &&
+                if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION) &&
                                 is_vma_temporary_stack(vma))
                         continue;