proc: faster /proc/cmdline

Use seq_puts() and skip format string processing.

Link: http://lkml.kernel.org/r/20180309222948.GB3843@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/proc/cmdline.c b/fs/proc/cmdline.c
index 403cbb12a6e9..8233e7af9389 100644
--- a/fs/proc/cmdline.c
+++ b/fs/proc/cmdline.c
@@ -6,7 +6,8 @@
 
 static int cmdline_proc_show(struct seq_file *m, void *v)
 {
-        seq_printf(m, "%s\n", saved_command_line);
+        seq_puts(m, saved_command_line);
+        seq_putc(m, '\n');
         return 0;
 }