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printk, lockdep: Disable lock debugging on zap_locks()

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zap_locks() is used by printk() in a last ditch effort to get data
out, clearly we cannot trust lock state after this so make it disable
lock debugging.

Also don't treat printk recursion through lockdep as a normal
recursion bug but try hard to get the lockdep splat out.

Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2011-06-07 11:17:30 +02:00 • committed by Ingo Molnar
commit 94d24fc472
2 changed files with 6 additions and 1 deletions
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3
kernel/printk.c
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@ -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 */
@ -856,7 +857,7 @@ 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;
}