coredump: introduce cn_vprintf()

Turn cn_printf(...) into cn_vprintf(va_list args), reintroduce
cn_printf() as a trivial wrapper.

This simplifies the next change and cn_vprintf() will have more
callers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Colin Walters <walters@verbum.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Cc: Lucas De Marchi <lucas.de.marchi@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 7 deletions

diff --git a/fs/coredump.c b/fs/coredump.c
index 11bc368e0017..c10a43aae220 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -69,17 +69,13 @@ static int expand_corename(struct core_name *cn)
         return 0;
 }
 
-static int cn_printf(struct core_name *cn, const char *fmt, ...)
+static int cn_vprintf(struct core_name *cn, const char *fmt, va_list arg)
 {
         char *cur;
         int need;
         int ret;
-        va_list arg;
 
-        va_start(arg, fmt);
         need = vsnprintf(NULL, 0, fmt, arg);
-        va_end(arg);
-
         if (likely(need < cn->size - cn->used - 1))
                 goto out_printf;
 
@@ -89,9 +85,7 @@ static int cn_printf(struct core_name *cn, const char *fmt, ...)
 
 out_printf:
         cur = cn->corename + cn->used;
-        va_start(arg, fmt);
         vsnprintf(cur, need + 1, fmt, arg);
-        va_end(arg);
         cn->used += need;
         return 0;
 
@@ -99,6 +93,18 @@ expand_fail:
         return ret;
 }
 
+static int cn_printf(struct core_name *cn, const char *fmt, ...)
+{
+        va_list arg;
+        int ret;
+
+        va_start(arg, fmt);
+        ret = cn_vprintf(cn, fmt, arg);
+        va_end(arg);
+
+        return ret;
+}
+
 static void cn_escape(char *str)
 {
         for (; *str; str++)