[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>

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 63543731977846822c1270d36b0c3ca5547f52f7..333741770f1e079f2fbe0df98b69699a4194f924 100644 (file)
--- 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;
 }