kernel/cred.c: remove unnecessary kdebug atomic reads

Commit e0e817392b9a ("CRED: Add some configurable debugging [try #6]")
added the kdebug mechanism to this file back in 2009.

The kdebug macro calls no_printk which always evaluates arguments.

Most of the kdebug uses have an unnecessary call of
	atomic_read(&cred->usage)

Make the kdebug macro do nothing by defining it with
	do { if (0) no_printk(...); } while (0)
when not enabled.

$ size kernel/cred.o* (defconfig x86-64)
   text	   data	    bss	    dec	    hex	filename
   2748	    336	      8	   3092	    c14	kernel/cred.o.new
   2788	    336	      8	   3132	    c3c	kernel/cred.o.old

Miscellanea:
o Neaten the #define kdebug macros while there

Signed-off-by: Joe Perches <joe@perches.com>
Cc: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/cred.c b/kernel/cred.c
index ec1c076..71179a0 100644 (file)
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -20,11 +20,16 @@
 #include <linux/cn_proc.h>
 
 #if 0
-#define kdebug(FMT, ...) \
-       printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
+#define kdebug(FMT, ...)                                               \
+       printk("[%-5.5s%5u] " FMT "\n",                                 \
+              current->comm, current->pid, ##__VA_ARGS__)
 #else
-#define kdebug(FMT, ...) \
-       no_printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
+#define kdebug(FMT, ...)                                               \
+do {                                                                   \
+       if (0)                                                          \
+               no_printk("[%-5.5s%5u] " FMT "\n",                      \
+                         current->comm, current->pid, ##__VA_ARGS__);  \
+} while (0)
 #endif
 
 static struct kmem_cache *cred_jar;