coredump: cn_vprintf() has no reason to call vsnprintf() twice
authorOleg Nesterov <oleg@redhat.com>
Wed, 3 Jul 2013 22:08:19 +0000 (15:08 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 3 Jul 2013 23:08:02 +0000 (16:08 -0700)
commit5fe9d8ca21cc1517258fe448639392d5d542eec6
treef1f5e8778d000c4bfaf7b44493186b48a6a5c7e3
parentbc03c691aa86948af4e272ebdcdd4203018210f3
coredump: cn_vprintf() has no reason to call vsnprintf() twice

cn_vprintf() looks really overcomplicated and sub-optimal.  We do not need
vsnprintf(NULL) to calculate the size we need, we can simply try to print
into the current buffer and expand/retry only if necessary.

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>
fs/coredump.c