printk/console: Allow to disable console output by using console="" or console=null

[linux-2.6-microblaze.git] / kernel / printk / printk.c

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index fe64a49..ac440b8 100644 (file)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2189,8 +2189,15 @@ static int __init console_setup(char *str)
        char *s, *options, *brl_options = NULL;
        int idx;
 
-       if (str[0] == 0)
+       /*
+        * console="" or console=null have been suggested as a way to
+        * disable console output. Use ttynull that has been created
+        * for exacly this purpose.
+        */
+       if (str[0] == 0 || strcmp(str, "null") == 0) {
+               __add_preferred_console("ttynull", 0, NULL, NULL, true);
                return 1;
+       }
 
        if (_braille_console_setup(&str, &brl_options))
                return 1;