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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 08:01:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 08:01:59 -0800
commit1483b3823542c9721eddf09a077af1e02ac96b50 (patch)
tree390dcff4ddfb8634ad62c7fc9c3c9d0e802e9c1e
parent4a2164a7dbf0d3b6a1c2ef6f20c0d54350491a12 (diff)
parent1a9a8aefa8f0530c97f4606ab7a2fc01fe31e9c1 (diff)
Merge branch 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: printk, lockdep: Switch to tracked irq ops printk, lockdep: Remove superfluous preempt_disable() printk, lockdep: Disable lock debugging on zap_locks()
-rw-r--r--include/linux/lockdep.h4
-rw-r--r--kernel/printk.c9
2 files changed, 8 insertions, 5 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b6a56e37284..d36619ead3b 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -343,6 +343,8 @@ extern void lockdep_trace_alloc(gfp_t mask);
#define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l))
+#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
+
#else /* !LOCKDEP */
static inline void lockdep_off(void)
@@ -392,6 +394,8 @@ struct lock_class_key { };
#define lockdep_assert_held(l) do { } while (0)
+#define lockdep_recursing(tsk) (0)
+
#endif /* !LOCKDEP */
#ifdef CONFIG_LOCK_STAT
diff --git a/kernel/printk.c b/kernel/printk.c
index afc8310c462..989e4a52da7 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -688,6 +688,7 @@ static void zap_locks(void)
oops_timestamp = jiffies;
+ debug_locks_off();
/* If a crash is occurring, make sure we can't deadlock */
raw_spin_lock_init(&logbuf_lock);
/* And make sure that we print immediately */
@@ -840,9 +841,8 @@ asmlinkage int vprintk(const char *fmt, va_list args)
boot_delay_msec();
printk_delay();
- preempt_disable();
/* This stops the holder of console_sem just where we want him */
- raw_local_irq_save(flags);
+ local_irq_save(flags);
this_cpu = smp_processor_id();
/*
@@ -856,7 +856,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
* recursion and return - but flag the recursion so that
* it can be printed at the next appropriate moment:
*/
- if (!oops_in_progress) {
+ if (!oops_in_progress && !lockdep_recursing(current)) {
recursion_bug = 1;
goto out_restore_irqs;
}
@@ -962,9 +962,8 @@ asmlinkage int vprintk(const char *fmt, va_list args)
lockdep_on();
out_restore_irqs:
- raw_local_irq_restore(flags);
+ local_irq_restore(flags);
- preempt_enable();
return printed_len;
}
EXPORT_SYMBOL(printk);