[PATCH] rate limiting for the ldisc open failure messages

This patch limits the messages when ldisc open faulures happen.  It happens
under memory pressure.

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 635437319778..333741770f1e 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2065,8 +2065,9 @@ fail_no_mem:
 
         /* call the tty release_mem routine to clean out this slot */
 release_mem_out:
-        printk(KERN_INFO "init_dev: ldisc open failed, "
-                         "clearing slot %d\n", idx);
+        if (printk_ratelimit())
+                printk(KERN_INFO "init_dev: ldisc open failed, "
+                                 "clearing slot %d\n", idx);
         release_mem(tty, idx);
         goto end_init;
 }