From 48926128430485bcf1ea8299080c8bb65a9e011e Mon Sep 17 00:00:00 2001 From: Andrew Cooks Date: Thu, 29 Nov 2012 14:18:18 +1100 Subject: [PATCH] printk: boot_delay should only affect output The boot_delay parameter affects all printk(), even if the log level prevents visible output from the call. It results in delays greater than the user intended without purpose. This patch changes the behaviour of boot_delay to only delay output. Signed-off-by: Andrew Cooks Acked-by: Randy Dunlap Cc: Joe Perches Signed-off-by: Andrew Morton --- kernel/printk.c | 40 +++++++++++++++++++++------------------- 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/kernel/printk.c b/kernel/printk.c index 71473edbc44c..725e0f7a134d 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -748,6 +748,21 @@ void __init setup_log_buf(int early) free, (free * 100) / __LOG_BUF_LEN); } +static bool __read_mostly ignore_loglevel; + +static int __init ignore_loglevel_setup(char *str) +{ + ignore_loglevel = 1; + printk(KERN_INFO "debug: ignoring loglevel setting.\n"); + + return 0; +} + +early_param("ignore_loglevel", ignore_loglevel_setup); +module_param(ignore_loglevel, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to" + "print all kernel messages to the console."); + #ifdef CONFIG_BOOT_PRINTK_DELAY static int boot_delay; /* msecs delay after each printk during bootup */ @@ -771,13 +786,15 @@ static int __init boot_delay_setup(char *str) } __setup("boot_delay=", boot_delay_setup); -static void boot_delay_msec(void) +static void boot_delay_msec(int level) { unsigned long long k; unsigned long timeout; - if (boot_delay == 0 || system_state != SYSTEM_BOOTING) + if ((boot_delay == 0 || system_state != SYSTEM_BOOTING) + || (level >= console_loglevel && !ignore_loglevel)) { return; + } k = (unsigned long long)loops_per_msec * boot_delay; @@ -796,7 +813,7 @@ static void boot_delay_msec(void) } } #else -static inline void boot_delay_msec(void) +static inline void boot_delay_msec(int level) { } #endif @@ -1239,21 +1256,6 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len) return do_syslog(type, buf, len, SYSLOG_FROM_CALL); } -static bool __read_mostly ignore_loglevel; - -static int __init ignore_loglevel_setup(char *str) -{ - ignore_loglevel = 1; - printk(KERN_INFO "debug: ignoring loglevel setting.\n"); - - return 0; -} - -early_param("ignore_loglevel", ignore_loglevel_setup); -module_param(ignore_loglevel, bool, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to" - "print all kernel messages to the console."); - /* * Call the console drivers, asking them to write out * log_buf[start] to log_buf[end - 1]. @@ -1499,7 +1501,7 @@ asmlinkage int vprintk_emit(int facility, int level, int this_cpu; int printed_len = 0; - boot_delay_msec(); + boot_delay_msec(level); printk_delay(); /* This stops the holder of console_sem just where we want him */ -- 2.39.5