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-rw-r--r--kernel/printk.c112
1 files changed, 50 insertions, 62 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 8fb01c32aa3b..07ad9e7f7a66 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -38,7 +38,7 @@
/*
* Architectures can override it:
*/
-void __attribute__((weak)) early_printk(const char *fmt, ...)
+void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
{
}
@@ -75,6 +75,8 @@ EXPORT_SYMBOL(oops_in_progress);
static DECLARE_MUTEX(console_sem);
static DECLARE_MUTEX(secondary_console_sem);
struct console *console_drivers;
+EXPORT_SYMBOL_GPL(console_drivers);
+
/*
* This is used for debugging the mess that is the VT code by
* keeping track if we have the console semaphore held. It's
@@ -121,6 +123,8 @@ struct console_cmdline
static struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES];
static int selected_console = -1;
static int preferred_console = -1;
+int console_set_on_cmdline;
+EXPORT_SYMBOL(console_set_on_cmdline);
/* Flag: console code may call schedule() */
static int console_may_schedule;
@@ -231,7 +235,7 @@ static inline void boot_delay_msec(void)
/*
* Return the number of unread characters in the log buffer.
*/
-int log_buf_get_len(void)
+static int log_buf_get_len(void)
{
return logged_chars;
}
@@ -268,19 +272,6 @@ int log_buf_copy(char *dest, int idx, int len)
}
/*
- * Extract a single character from the log buffer.
- */
-int log_buf_read(int idx)
-{
- char ret;
-
- if (log_buf_copy(&ret, idx, 1) == 1)
- return ret;
- else
- return -1;
-}
-
-/*
* Commands to do_syslog:
*
* 0 -- Close the log. Currently a NOP.
@@ -665,18 +656,17 @@ static int acquire_console_semaphore_for_printk(unsigned int cpu)
spin_unlock(&logbuf_lock);
return retval;
}
-
-const char printk_recursion_bug_msg [] =
- KERN_CRIT "BUG: recent printk recursion!\n";
-static int printk_recursion_bug;
+static const char recursion_bug_msg [] =
+ KERN_CRIT "BUG: recent printk recursion!\n";
+static int recursion_bug;
+ static int new_text_line = 1;
+static char printk_buf[1024];
asmlinkage int vprintk(const char *fmt, va_list args)
{
- static int log_level_unknown = 1;
- static char printk_buf[1024];
-
- unsigned long flags;
int printed_len = 0;
+ int current_log_level = default_message_loglevel;
+ unsigned long flags;
int this_cpu;
char *p;
@@ -699,7 +689,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
* it can be printed at the next appropriate moment:
*/
if (!oops_in_progress) {
- printk_recursion_bug = 1;
+ recursion_bug = 1;
goto out_restore_irqs;
}
zap_locks();
@@ -709,70 +699,62 @@ asmlinkage int vprintk(const char *fmt, va_list args)
spin_lock(&logbuf_lock);
printk_cpu = this_cpu;
- if (printk_recursion_bug) {
- printk_recursion_bug = 0;
- strcpy(printk_buf, printk_recursion_bug_msg);
- printed_len = sizeof(printk_recursion_bug_msg);
+ if (recursion_bug) {
+ recursion_bug = 0;
+ strcpy(printk_buf, recursion_bug_msg);
+ printed_len = sizeof(recursion_bug_msg);
}
/* Emit the output into the temporary buffer */
printed_len += vscnprintf(printk_buf + printed_len,
sizeof(printk_buf) - printed_len, fmt, args);
+
/*
* Copy the output into log_buf. If the caller didn't provide
* appropriate log level tags, we insert them here
*/
for (p = printk_buf; *p; p++) {
- if (log_level_unknown) {
- /* log_level_unknown signals the start of a new line */
+ if (new_text_line) {
+ /* If a token, set current_log_level and skip over */
+ if (p[0] == '<' && p[1] >= '0' && p[1] <= '7' &&
+ p[2] == '>') {
+ current_log_level = p[1] - '0';
+ p += 3;
+ printed_len -= 3;
+ }
+
+ /* Always output the token */
+ emit_log_char('<');
+ emit_log_char(current_log_level + '0');
+ emit_log_char('>');
+ printed_len += 3;
+ new_text_line = 0;
+
if (printk_time) {
- int loglev_char;
+ /* Follow the token with the time */
char tbuf[50], *tp;
unsigned tlen;
unsigned long long t;
unsigned long nanosec_rem;
- /*
- * force the log level token to be
- * before the time output.
- */
- if (p[0] == '<' && p[1] >='0' &&
- p[1] <= '7' && p[2] == '>') {
- loglev_char = p[1];
- p += 3;
- printed_len -= 3;
- } else {
- loglev_char = default_message_loglevel
- + '0';
- }
t = cpu_clock(printk_cpu);
nanosec_rem = do_div(t, 1000000000);
- tlen = sprintf(tbuf,
- "<%c>[%5lu.%06lu] ",
- loglev_char,
- (unsigned long)t,
- nanosec_rem/1000);
+ tlen = sprintf(tbuf, "[%5lu.%06lu] ",
+ (unsigned long) t,
+ nanosec_rem / 1000);
for (tp = tbuf; tp < tbuf + tlen; tp++)
emit_log_char(*tp);
printed_len += tlen;
- } else {
- if (p[0] != '<' || p[1] < '0' ||
- p[1] > '7' || p[2] != '>') {
- emit_log_char('<');
- emit_log_char(default_message_loglevel
- + '0');
- emit_log_char('>');
- printed_len += 3;
- }
}
- log_level_unknown = 0;
+
if (!*p)
break;
}
+
emit_log_char(*p);
if (*p == '\n')
- log_level_unknown = 1;
+ new_text_line = 1;
}
/*
@@ -890,6 +872,7 @@ static int __init console_setup(char *str)
*s = 0;
__add_preferred_console(buf, idx, options, brl_options);
+ console_set_on_cmdline = 1;
return 1;
}
__setup("console=", console_setup);
@@ -1041,7 +1024,9 @@ void release_console_sem(void)
_log_end = log_end;
con_start = log_end; /* Flush */
spin_unlock(&logbuf_lock);
+ stop_critical_timings(); /* don't trace print latency */
call_console_drivers(_con_start, _log_end);
+ start_critical_timings();
local_irq_restore(flags);
}
console_locked = 0;
@@ -1172,8 +1157,11 @@ void register_console(struct console *console)
console->index = 0;
if (console->setup == NULL ||
console->setup(console, NULL) == 0) {
- console->flags |= CON_ENABLED | CON_CONSDEV;
- preferred_console = 0;
+ console->flags |= CON_ENABLED;
+ if (console->device) {
+ console->flags |= CON_CONSDEV;
+ preferred_console = 0;
+ }
}
}