kernel/printk: use symbolic defines for console loglevels

... instead of naked numbers.

Stuff in sysrq.c used to set it to 8 which is supposed to mean above
default level so set it to DEBUG instead as we're terminating/killing all
tasks and we want to be verbose there.

Also, correct the check in x86_64_start_kernel which should be >= as
we're clearly issuing the string there for all debug levels, not only
the magical 10.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Joe Perches <joe@perches.com>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 2 deletions

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 37f3a6589c1c..319ff7e53efb 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -30,6 +30,17 @@ static inline const char *printk_skip_level(const char *buffer)
         return buffer;
 }
 
+/* printk's without a loglevel use this.. */
+#define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL
+
+/* We show everything that is MORE important than this.. */
+#define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
+#define CONSOLE_LOGLEVEL_MIN     1 /* Minimum loglevel we let people use */
+#define CONSOLE_LOGLEVEL_QUIET   4 /* Shhh ..., when booted with "quiet" */
+#define CONSOLE_LOGLEVEL_DEFAULT 7 /* anything MORE serious than KERN_DEBUG */
+#define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
+#define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
+
 extern int console_printk[];
 
 #define console_loglevel (console_printk[0])
@@ -39,13 +50,13 @@ extern int console_printk[];
 
 static inline void console_silent(void)
 {
-        console_loglevel = 0;
+        console_loglevel = CONSOLE_LOGLEVEL_SILENT;
 }
 
 static inline void console_verbose(void)
 {
         if (console_loglevel)
-                console_loglevel = 15;
+                console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
 }
 
 struct va_format {