mm: remove unused VM_<READfoo> macros and expand other in-place

These VM_<READfoo> macros aren't used very often and three of them
aren't used at all.

Expand the ones that are used in-place, and remove all the now unused
#define VM_<foo> macros.

VM_READHINTMASK, VM_NormalReadHint and VM_ClearReadHint were added just
before 2.4 and appears have never been used.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm.h

@@ -151,12 +151,6 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_STACK_FLAGS	(VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
 #endif
 
-#define VM_READHINTMASK			(VM_SEQ_READ | VM_RAND_READ)
-#define VM_ClearReadHint(v)		(v)->vm_flags &= ~VM_READHINTMASK
-#define VM_NormalReadHint(v)		(!((v)->vm_flags & VM_READHINTMASK))
-#define VM_SequentialReadHint(v)	((v)->vm_flags & VM_SEQ_READ)
-#define VM_RandomReadHint(v)		((v)->vm_flags & VM_RAND_READ)
-
 /*
  * Special vmas that are non-mergable, non-mlock()able.
  * Note: mm/huge_memory.c VM_NO_THP depends on this definition.

mm/filemap.c

@@ -1539,12 +1539,12 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 	struct address_space *mapping = file->f_mapping;
 
 	/* If we don't want any read-ahead, don't bother */
-	if (VM_RandomReadHint(vma))
+	if (vma->vm_flags & VM_RAND_READ)
 		return;
 	if (!ra->ra_pages)
 		return;
 
-	if (VM_SequentialReadHint(vma)) {
+	if (vma->vm_flags & VM_SEQ_READ) {
 		page_cache_sync_readahead(mapping, ra, file, offset,
 					  ra->ra_pages);
 		return;
@@ -1584,7 +1584,7 @@ static void do_async_mmap_readahead(struct vm_area_struct *vma,
 	struct address_space *mapping = file->f_mapping;
 
 	/* If we don't want any read-ahead, don't bother */
-	if (VM_RandomReadHint(vma))
+	if (vma->vm_flags & VM_RAND_READ)
 		return;
 	if (ra->mmap_miss > 0)
 		ra->mmap_miss--;

mm/memory.c

@@ -1150,7 +1150,7 @@ again:
 				if (pte_dirty(ptent))
 					set_page_dirty(page);
 				if (pte_young(ptent) &&
-				    likely(!VM_SequentialReadHint(vma)))
+				    likely(!(vma->vm_flags & VM_SEQ_READ)))
 					mark_page_accessed(page);
 				rss[MM_FILEPAGES]--;
 			}

mm/rmap.c

@@ -720,7 +720,7 @@ int page_referenced_one(struct page *page, struct vm_area_struct *vma,
 			 * mapping is already gone, the unmap path will have
 			 * set PG_referenced or activated the page.
 			 */
-			if (likely(!VM_SequentialReadHint(vma)))
+			if (likely(!(vma->vm_flags & VM_SEQ_READ)))
 				referenced++;
 		}
 		pte_unmap_unlock(pte, ptl);