tracing, genirq: add irq enter and exit trace events

[linux-2.6] / kernel / printk.c

diff --git a/kernel/printk.c b/kernel/printk.c
index 7015733..e3602d0 100644 (file)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -73,7 +73,6 @@ EXPORT_SYMBOL(oops_in_progress);
  * driver system.
  */
 static DECLARE_MUTEX(console_sem);
-static DECLARE_MUTEX(secondary_console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
@@ -382,7 +381,7 @@ out:
        return error;
 }
 
-asmlinkage long sys_syslog(int type, char __user *buf, int len)
+SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
 {
        return do_syslog(type, buf, len);
 }
@@ -742,11 +741,6 @@ EXPORT_SYMBOL(vprintk);
 
 #else
 
-asmlinkage long sys_syslog(int type, char __user *buf, int len)
-{
-       return -ENOSYS;
-}
-
 static void call_console_drivers(unsigned start, unsigned end)
 {
 }
@@ -896,12 +890,14 @@ void suspend_console(void)
        printk("Suspending console(s) (use no_console_suspend to debug)\n");
        acquire_console_sem();
        console_suspended = 1;
+       up(&console_sem);
 }
 
 void resume_console(void)
 {
        if (!console_suspend_enabled)
                return;
+       down(&console_sem);
        console_suspended = 0;
        release_console_sem();
 }
@@ -917,11 +913,9 @@ void resume_console(void)
 void acquire_console_sem(void)
 {
        BUG_ON(in_interrupt());
-       if (console_suspended) {
-               down(&secondary_console_sem);
-               return;
-       }
        down(&console_sem);
+       if (console_suspended)
+               return;
        console_locked = 1;
        console_may_schedule = 1;
 }
@@ -931,6 +925,10 @@ int try_acquire_console_sem(void)
 {
        if (down_trylock(&console_sem))
                return -1;
+       if (console_suspended) {
+               up(&console_sem);
+               return -1;
+       }
        console_locked = 1;
        console_may_schedule = 0;
        return 0;
@@ -984,7 +982,7 @@ void release_console_sem(void)
        unsigned wake_klogd = 0;
 
        if (console_suspended) {
-               up(&secondary_console_sem);
+               up(&console_sem);
                return;
        }