diff options
Diffstat (limited to 'kernel/printk.c')
-rw-r--r-- | kernel/printk.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 28a40d8171b8..1baace7d8674 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -53,6 +53,10 @@ void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...) #define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) +#ifdef CONFIG_DEBUG_LL +extern void printascii(char *); +#endif + /* printk's without a loglevel use this.. */ #define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL @@ -290,6 +294,53 @@ static inline void boot_delay_msec(void) } #endif +/* + * Return the number of unread characters in the log buffer. + */ +static int log_buf_get_len(void) +{ + return logged_chars; +} + +/* + * Clears the ring-buffer + */ +void log_buf_clear(void) +{ + logged_chars = 0; +} + +/* + * Copy a range of characters from the log buffer. + */ +int log_buf_copy(char *dest, int idx, int len) +{ + int ret, max; + bool took_lock = false; + + if (!oops_in_progress) { + spin_lock_irq(&logbuf_lock); + took_lock = true; + } + + max = log_buf_get_len(); + if (idx < 0 || idx >= max) { + ret = -1; + } else { + if (len > max - idx) + len = max - idx; + ret = len; + idx += (log_end - max); + while (len-- > 0) + dest[len] = LOG_BUF(idx + len); + } + + if (took_lock) + spin_unlock_irq(&logbuf_lock); + + return ret; +} + #ifdef CONFIG_SECURITY_DMESG_RESTRICT int dmesg_restrict = 1; #else @@ -876,6 +927,10 @@ asmlinkage int vprintk(const char *fmt, va_list args) printed_len += vscnprintf(printk_buf + printed_len, sizeof(printk_buf) - printed_len, fmt, args); +#ifdef CONFIG_DEBUG_LL + printascii(printk_buf); +#endif + p = printk_buf; /* Read log level and handle special printk prefix */ @@ -1150,7 +1205,6 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self, switch (action) { case CPU_ONLINE: case CPU_DEAD: - case CPU_DYING: case CPU_DOWN_FAILED: case CPU_UP_CANCELED: console_lock(); |