6 files changed, 11 insertions, 28 deletions

diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 3f810acd0bfa..b1ca234068f6 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -87,8 +87,7 @@ static int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
         xpages = 1UL << order;
         npages = (newsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
-        for (loop = 0; loop < npages; loop++)
-                set_page_count(pages + loop, 1);
+        split_page(pages, order);
 
         /* trim off any pages we don't actually require */
         for (loop = npages; loop < xpages; loop++)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9b3cdfc8046d..3d84b7a35e0d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -327,11 +327,7 @@ static inline void get_page(struct page *page)
 
 void put_page(struct page *page);
 
-#ifdef CONFIG_MMU
 void split_page(struct page *page, unsigned int order);
-#else
-static inline void split_page(struct page *page, unsigned int order) {}
-#endif
 
 /*
  * Multiple processes may "see" the same page. E.g. for untouched
diff --git a/mm/internal.h b/mm/internal.h
index e3042db2a2d6..7bb339779818 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -15,19 +15,7 @@
 
 static inline void set_page_refs(struct page *page, int order)
 {
-#ifdef CONFIG_MMU
         set_page_count(page, 1);
-#else
-        int i;
-
-        /*
-         * We need to reference all the pages for this order, otherwise if
-         * anyone accesses one of the pages with (get/put) it will be freed.
-         * - eg: access_process_vm()
-         */
-        for (i = 0; i < (1 << order); i++)
-                set_page_count(page + i, 1);
-#endif /* CONFIG_MMU */
 }
 
 static inline void __put_page(struct page *page)
diff --git a/mm/nommu.c b/mm/nommu.c
index 4951f4786f28..db45efac17cc 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -159,7 +159,7 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
         /*
          * kmalloc doesn't like __GFP_HIGHMEM for some reason
          */
-        return kmalloc(size, gfp_mask & ~__GFP_HIGHMEM);
+        return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM);
 }
 
 struct page * vmalloc_to_page(void *addr)
@@ -623,7 +623,7 @@ static int do_mmap_private(struct vm_area_struct *vma, unsigned long len)
          * - note that this may not return a page-aligned address if the object
          *   we're allocating is smaller than a page
          */
-        base = kmalloc(len, GFP_KERNEL);
+        base = kmalloc(len, GFP_KERNEL|__GFP_COMP);
         if (!base)
                 goto enomem;
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7aa0181287e1..e197818a7cf6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -422,11 +422,6 @@ static void __free_pages_ok(struct page *page, unsigned int order)
                 mutex_debug_check_no_locks_freed(page_address(page),
                                                  PAGE_SIZE<<order);
 
-#ifndef CONFIG_MMU
-        for (i = 1 ; i < (1 << order) ; ++i)
-                __put_page(page + i);
-#endif
-
         for (i = 0 ; i < (1 << order) ; ++i)
                 reserved += free_pages_check(page + i);
         if (reserved)
@@ -746,7 +741,6 @@ static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
                 clear_highpage(page + i);
 }
 
-#ifdef CONFIG_MMU
 /*
  * split_page takes a non-compound higher-order page, and splits it into
  * n (1<<order) sub-pages: page[0..n]
@@ -766,7 +760,6 @@ void split_page(struct page *page, unsigned int order)
                 set_page_count(page + i, 1);
         }
 }
-#endif
 
 /*
  * Really, prep_compound_page() should be called from __rmqueue_bulk().  But
diff --git a/mm/slab.c b/mm/slab.c
index f477acfb732f..ff0ab772f49d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -590,6 +590,8 @@ static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
 
 static inline struct kmem_cache *page_get_cache(struct page *page)
 {
+        if (unlikely(PageCompound(page)))
+                page = (struct page *)page_private(page);
         return (struct kmem_cache *)page->lru.next;
 }
 
@@ -600,6 +602,8 @@ static inline void page_set_slab(struct page *page, struct slab *slab)
 
 static inline struct slab *page_get_slab(struct page *page)
 {
+        if (unlikely(PageCompound(page)))
+                page = (struct page *)page_private(page);
         return (struct slab *)page->lru.prev;
 }
 
@@ -2412,8 +2416,11 @@ static void set_slab_attr(struct kmem_cache *cachep, struct slab *slabp,
         struct page *page;
 
         /* Nasty!!!!!! I hope this is OK. */
-        i = 1 << cachep->gfporder;
         page = virt_to_page(objp);
+
+        i = 1;
+        if (likely(!PageCompound(page)))
+                i <<= cachep->gfporder;
         do {
                 page_set_cache(page, cachep);
                 page_set_slab(page, slabp);