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>

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 05ed2828a5535bfe151c17ab2b5a656a5209ef4c..855c337b20c35cb22ef0a3fa6213cfb82a3a90b0 100644 (file)
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -8,7 +8,6 @@
 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
 
 #ifdef CONFIG_MIGRATION
-#define PAGE_MIGRATION 1
 
 extern void putback_lru_pages(struct list_head *l);
 extern int migrate_page(struct address_space *,
@@ -32,7 +31,6 @@ extern void migrate_page_copy(struct page *newpage, struct page *page);
 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
                                  struct page *newpage, struct page *page);
 #else
-#define PAGE_MIGRATION 0
 
 static inline void putback_lru_pages(struct list_head *l) {}
 static inline int migrate_pages(struct list_head *l, new_page_t x,

diff --git a/mm/mprotect.c b/mm/mprotect.c
index f437d054c3bf6884fd5ba6f18338fbf7272c43a4..c621e999cbf70e254827b182ac926c71fe5e3697 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -60,7 +60,7 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
                                ptent = pte_mkwrite(ptent);
 
                        ptep_modify_prot_commit(mm, addr, pte, ptent);
-               } else if (PAGE_MIGRATION && !pte_file(oldpte)) {
+               } else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
                        swp_entry_t entry = pte_to_swp_entry(oldpte);
 
                        if (is_write_migration_entry(entry)) {

diff --git a/mm/rmap.c b/mm/rmap.c
index c8454e06b6c84b424de3952c567fbbcc8264ff75..78cc46b876e678b7b753677c5408c9a314556043 100644 (file)
--- 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;