[PATCH] spufs: fix local store page refcounting

With the new rules for reserved pages, the spufs now
needs working page reference counting.

I should probably look into converting to vm_insert_page,
but for now this patch makes spufs work again.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/setup.c

@@ -114,7 +114,7 @@ static void __init cell_spuprop_present(struct device_node *spe,
 		for (pfn = start_pfn; pfn < end_pfn; pfn++) {
 			struct page *page = pfn_to_page(pfn);
 			set_page_links(page, ZONE_DMA, node_id, pfn);
-			set_page_count(page, 0);
+			set_page_count(page, 1);
 			reset_page_mapcount(page);
 			SetPageReserved(page);
 			INIT_LIST_HEAD(&page->lru);

arch/powerpc/platforms/cell/spufs/file.c

@@ -23,6 +23,7 @@
 #include <linux/fs.h>
 #include <linux/ioctl.h>
 #include <linux/module.h>
+#include <linux/pagemap.h>
 #include <linux/poll.h>
 
 #include <asm/io.h>
@@ -106,6 +107,7 @@ spufs_mem_mmap_nopage(struct vm_area_struct *vma,
 	if (type)
 		*type = VM_FAULT_MINOR;
 
+	page_cache_get(page);
 	return page;
 }
 
@@ -120,7 +122,6 @@ spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
 		return -EINVAL;
 
 	/* FIXME: */
-	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 				     | _PAGE_NO_CACHE);