From: Sergey Popov < popov_ser...@ukr.net > Prevent increase of console_loglevel by 'quiet'
'quiet' kernel option that follows the 'loglevel=N' should not blindly overwrite console_loglevel, instead it should respect and keep lower 'loglevel'. Signed-off-by: Sergey Popov < popov_ser...@ukr.net > --- init/main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) Some drivers tend to print error messages (ex: 'drm/i810 does not support SMP') to the console that we at our company don't want to show to people. We use 'quiet' kernel option to hide kernel decompressing progress and other messages not related to printk. But to hide error messages from drivers we use 'loglevel=3' parameter as well. But when it's _before_ the quiet, then quiet overrides loglevel=3 and set it to be 4. I think that's a bug, and here's simple solution for it. The only way to live without this patch is to pass 'loglevel=3' after the 'quiet'. This issue is known to the community, but everyone is using workaround (ex: https://wiki.archlinux.org/index.php/Silent_boot ). diff --git a/init/main.c b/init/main.c index 61b99376..91fc78b 100644 --- a/init/main.c +++ b/init/main.c @@ -211,7 +211,12 @@ static int __init debug_kernel(char *str) static int __init quiet_kernel(char *str) { - console_loglevel = CONSOLE_LOGLEVEL_QUIET; + /* + * 'quiet' option should not raise console_loglevel, it's only + * allowed to lower it + */ + if (console_loglevel > CONSOLE_LOGLEVEL_QUIET) + console_loglevel = CONSOLE_LOGLEVEL_QUIET; return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
