Use zero_user_page() instead of open-coding it. 

Signed-off-by: Nate Diller <[EMAIL PROTECTED]>

--- 

diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/ext3/inode.c 
linux-2.6.21-rc6-mm1-test/fs/ext3/inode.c
--- linux-2.6.21-rc6-mm1/fs/ext3/inode.c        2007-04-09 17:24:03.000000000 
-0700
+++ linux-2.6.21-rc6-mm1-test/fs/ext3/inode.c   2007-04-09 18:18:23.000000000 
-0700
@@ -1767,7 +1767,6 @@ static int ext3_block_truncate_page(hand
        struct inode *inode = mapping->host;
        struct buffer_head *bh;
        int err = 0;
-       void *kaddr;
 
        blocksize = inode->i_sb->s_blocksize;
        length = blocksize - (offset & (blocksize - 1));
@@ -1779,10 +1778,7 @@ static int ext3_block_truncate_page(hand
         */
        if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
             ext3_should_writeback_data(inode) && PageUptodate(page)) {
-               kaddr = kmap_atomic(page, KM_USER0);
-               memset(kaddr + offset, 0, length);
-               flush_dcache_page(page);
-               kunmap_atomic(kaddr, KM_USER0);
+               zero_user_page(page, offset, length);
                set_page_dirty(page);
                goto unlock;
        }
@@ -1835,11 +1831,7 @@ static int ext3_block_truncate_page(hand
                        goto unlock;
        }
 
-       kaddr = kmap_atomic(page, KM_USER0);
-       memset(kaddr + offset, 0, length);
-       flush_dcache_page(page);
-       kunmap_atomic(kaddr, KM_USER0);
-
+       zero_user_page(page, offset, length);
        BUFFER_TRACE(bh, "zeroed end of block");
 
        err = 0;
-
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