mm: optimize acorn partition truncate

invalidate_bdev() is superfluous when truncate_inode_pages() is also
called.  do call invalidate_bh_lrus() though, to avoid stale pointers.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/partitions/acorn.c b/fs/partitions/acorn.c
index 9a6826c..e349132 100644 (file)
--- a/fs/partitions/acorn.c
+++ b/fs/partitions/acorn.c
@@ -271,7 +271,7 @@ adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
                extern void xd_set_geometry(struct block_device *,
                        unsigned char, unsigned char, unsigned int);
                xd_set_geometry(bdev, dr->secspertrack, heads, 1);
-               invalidate_bdev(bdev);
+               invalidate_bh_lrus();
                truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
        }
 #endif