9p: Reduce object size with CONFIG_NET_9P_DEBUG

Reduce object size by deduplicating formats.

Use vsprintf extension %pV.
Rename P9_DPRINTK uses to p9_debug, align arguments.
Add function for _p9_debug and macro to add __func__.
Add missing "\n"s to p9_debug uses.
Remove embedded function names as p9_debug adds it.
Remove P9_EPRINTK macro and convert use to pr_<level>.
Add and use pr_fmt and pr_<level>.

$ size fs/9p/built-in.o*
   text	   data	    bss	    dec	    hex	filename
  62133	    984	  16000	  79117	  1350d	fs/9p/built-in.o.new
  67342	    984	  16928	  85254	  14d06	fs/9p/built-in.o.old
$ size net/9p/built-in.o*
   text	   data	    bss	    dec	    hex	filename
  88792	   4148	  22024	 114964	  1c114	net/9p/built-in.o.new
  94072	   4148	  23232	 121452	  1da6c	net/9p/built-in.o.old

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/9p/error.c b/net/9p/error.c
index 52518512a93e..2ab2de76010f 100644
--- a/net/9p/error.c
+++ b/net/9p/error.c
@@ -27,6 +27,8 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/jhash.h>
@@ -237,8 +239,8 @@ int p9_errstr2errno(char *errstr, int len)
         if (errno == 0) {
                 /* TODO: if error isn't found, add it dynamically */
                 errstr[len] = 0;
-                printk(KERN_ERR "%s: server reported unknown error %s\n",
-                        __func__, errstr);
+                pr_err("%s: server reported unknown error %s\n",
+                       __func__, errstr);
                 errno = ESERVERFAULT;
         }