From b14c6f42b25867e943165aa5eab719c7d8fe1b75 Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Sun, 23 Jan 2011 12:03:17 -0500
Subject: [PATCH] cond_resched_softirq: mask SOFTIRQ_OFFSET in __might_sleep on RT

This is one of several extractions from the merge up to 33-rc8.

See it in a git tip repo with:

   git diff 5f854cfc024622e4aae14d7cf422f6ff86278688^2 \
	5f854cfc024622e4aae14d7cf422f6ff86278688 \
	include/linux/sched.h

(Yes, it is in there, along with lots of other sched.h changes...)

You can find the origin of this change in the tip merge commit:

     commit 5f854cfc024622e4aae14d7cf422f6ff86278688
     Merge: cc24da0 4ec62b2
     Author: Thomas Gleixner <tglx@linutronix.de>
     Date:   Sun Feb 21 20:17:22 2010 +0100

         Forward to 2.6.33-rc8

         Merge branch 'linus' into rt/head with a pile of conflicts.

         Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Normally there are not significant changes/additions in a merge commit that
are not from any other "normal" commit.  But in this case there are, so
break them out into separate explicit commits.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7165ba5..30cbb0a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2540,10 +2540,18 @@ extern int __cond_resched_lock(spinlock_t *lock);
 
 extern int __cond_resched_softirq(void);
 
+
+#ifndef CONFIG_PREEMPT_RT
 #define cond_resched_softirq() ({				\
 	__might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET);	\
 	__cond_resched_softirq();				\
 })
+#else
+#define cond_resched_softirq() ({				\
+	__might_sleep(__FILE__, __LINE__, 0);			\
+	__cond_resched_softirq();				\
+})
+#endif
 
 extern int cond_resched_softirq_context(void);
 
-- 
1.7.1.1