An earlier change in -mm (printk: remove separate printk_sched
buffers...), removed the printk_sched irqsave/restore lines
since it was safe for current users. Since we may be expanding
usage of printk_sched(), disable preepmtion for this function
to make it more generally safe to call.
Cc: Jan Kara <j...@suse.cz>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Jiri Bohac <jbo...@suse.cz>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Steven Rostedt <rost...@goodmis.org>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
kernel/printk/printk.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 82d19e6..57467df 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2589,12 +2589,14 @@ int printk_sched(const char *fmt, ...)
va_list args;
int r;
+ preempt_disable();
va_start(args, fmt);
r = vprintk_emit(0, SCHED_MESSAGE_LOGLEVEL, NULL, 0, fmt, args);
va_end(args);
__this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT);
irq_work_queue(&__get_cpu_var(wake_up_klogd_work));
+ preempt_enable();
return r;
}
--
1.9.1
--
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