[PATCH] kmap->kmap_atomic in mpage.c

Replace some kmaps in mpage.c with kmap_atomic.

fs/mpage.c

@@ -210,10 +210,11 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
 	}
 
 	if (first_hole != blocks_per_page) {
-		memset(kmap(page) + (first_hole << blkbits), 0,
+		char *kaddr = kmap_atomic(page, KM_USER0);
+		memset(kaddr + (first_hole << blkbits), 0,
 				PAGE_CACHE_SIZE - (first_hole << blkbits));
 		flush_dcache_page(page);
-		kunmap(page);
+		kunmap_atomic(kaddr, KM_USER0);
 		if (first_hole == 0) {
 			SetPageUptodate(page);
 			unlock_page(page);
@@ -427,12 +428,14 @@ mpage_writepage(struct bio *bio, struct page *page, get_block_t get_block,
 	end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 	if (page->index >= end_index) {
 		unsigned offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
+		char *kaddr;
 
 		if (page->index > end_index || !offset)
 			goto confused;
-		memset(kmap(page) + offset, 0, PAGE_CACHE_SIZE - offset);
+		kaddr = kmap_atomic(page, KM_USER0);
+		memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
 		flush_dcache_page(page);
-		kunmap(page);
+		kunmap_atomic(kaddr, KM_USER0);
 	}
 
 page_is_mapped: