From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 14 Jul 2015 14:26:34 +0200
Subject: [PATCH 225/353] panic: skip get_random_bytes for RT_FULL in
 init_oops_id
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=5fdcde0cec433e6436fb29f131ff72cbfd616adf

Disable on -RT. If this is invoked from irq-context we will have problems
to acquire the sleeping lock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/panic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index 982ecba286c0..51d6c00f9d7a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -544,9 +544,11 @@ static u64 oops_id;
 
 static int init_oops_id(void)
 {
+#ifndef CONFIG_PREEMPT_RT_FULL
 	if (!oops_id)
 		get_random_bytes(&oops_id, sizeof(oops_id));
 	else
+#endif
 		oops_id++;
 
 	return 0;