[PATCH] make "struct d_cookie" depend on CONFIG_PROFILING

Shrinks "struct dentry" from 128 bytes to 124 on x86, allowing 31 objects
per slab instead of 30.

Cc: John Levon <levon@movementarian.org>
Cc: Philippe Elie <phil.el@wanadoo.fr>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/dcache.c b/fs/dcache.c
index 86bdb93..a173bba 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -743,7 +743,9 @@
 	dentry->d_op = NULL;
 	dentry->d_fsdata = NULL;
 	dentry->d_mounted = 0;
+#ifdef CONFIG_PROFILING
 	dentry->d_cookie = NULL;
+#endif
 	INIT_HLIST_NODE(&dentry->d_hash);
 	INIT_LIST_HEAD(&dentry->d_lru);
 	INIT_LIST_HEAD(&dentry->d_subdirs);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index a3ed5e0..a3f0994 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -108,7 +108,9 @@
 	struct dentry_operations *d_op;
 	struct super_block *d_sb;	/* The root of the dentry tree */
 	void *d_fsdata;			/* fs-specific data */
+#ifdef CONFIG_PROFILING
 	struct dcookie_struct *d_cookie; /* cookie, if any */
+#endif
 	int d_mounted;
 	unsigned char d_iname[DNAME_INLINE_LEN_MIN];	/* small names */
 };