diff options
Diffstat (limited to 'kernel/printk.c')
| -rw-r--r-- | kernel/printk.c | 52 |
1 files changed, 32 insertions, 20 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 2d607f4d179..19c0d7bcf24 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -87,6 +87,12 @@ static DEFINE_SEMAPHORE(console_sem); struct console *console_drivers; EXPORT_SYMBOL_GPL(console_drivers); +#ifdef CONFIG_LOCKDEP +static struct lockdep_map console_lock_dep_map = { + .name = "console_lock" +}; +#endif + /* * This is used for debugging the mess that is the VT code by * keeping track if we have the console semaphore held. It's @@ -741,6 +747,21 @@ 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 */ @@ -764,13 +785,15 @@ 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; @@ -789,7 +812,7 @@ static void boot_delay_msec(void) } } #else -static inline void boot_delay_msec(void) +static inline void boot_delay_msec(int level) { } #endif @@ -1232,21 +1255,6 @@ 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]. @@ -1492,7 +1500,7 @@ 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 */ @@ -1908,12 +1916,14 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self, */ void console_lock(void) { - BUG_ON(in_interrupt()); + might_sleep(); + down(&console_sem); if (console_suspended) return; console_locked = 1; console_may_schedule = 1; + mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_); } EXPORT_SYMBOL(console_lock); @@ -1935,6 +1945,7 @@ int console_trylock(void) } console_locked = 1; console_may_schedule = 0; + mutex_acquire(&console_lock_dep_map, 0, 1, _RET_IP_); return 1; } EXPORT_SYMBOL(console_trylock); @@ -2095,6 +2106,7 @@ skip: local_irq_restore(flags); } console_locked = 0; + mutex_release(&console_lock_dep_map, 1, _RET_IP_); /* Release the exclusive_console once it is used */ if (unlikely(exclusive_console)) |