[PATCH] remove the syslog interface when printk is disabled

Attempts to read() from the non-existent dmesg buffer will return zero and
userspace tends to get stuck in a busyloop.

So just remove /dev/kmsg altogether if CONFIG_PRINTK=n.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 93c43b676e59..51815cece6f3 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -696,9 +696,11 @@ void __init proc_misc_init(void)
         proc_symlink("mounts", NULL, "self/mounts");
 
         /* And now for trickier ones */
+#ifdef CONFIG_PRINTK
         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
         if (entry)
                 entry->proc_fops = &proc_kmsg_operations;
+#endif
         create_seq_entry("devices", 0, &proc_devinfo_operations);
         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 #ifdef CONFIG_BLOCK