litmus-rt.git - The LITMUS^RT kernel.

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1 files changed, 1 insertions, 1 deletions


diff --git a/Makefile b/Makefile index 4643d579fc87..b1c458c2522d 100644 --- a/Makefile +++ b/Makefile
@@ -1,7 +1,7 @@
1	VERSION = 2	1	VERSION = 2
2	PATCHLEVEL = 6	2	PATCHLEVEL = 6
3	SUBLEVEL = 15	3	SUBLEVEL = 15
4	EXTRAVERSION =-rc4	4	EXTRAVERSION =-rc5
5	NAME=Affluent Albatross	5	NAME=Affluent Albatross
6		6
7	# DOCUMENTATION	7	# DOCUMENTATION

/* * Read-Copy Update mechanism for mutual exclusion * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Copyright IBM Corporation, 2001 * * Authors: Dipankar Sarma <dipankar@in.ibm.com> * Manfred Spraul <manfred@colorfullife.com> * * Based on the original work by Paul McKenney <paulmck@us.ibm.com> * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. * Papers: * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001) * * For detailed explanation of Read-Copy Update mechanism see - * http://lse.sourceforge.net/locking/rcupdate.html * */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/spinlock.h> #include <linux/smp.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/atomic.h> #include <linux/bitops.h> #include <linux/percpu.h> #include <linux/notifier.h> #include <linux/cpu.h> #include <linux/mutex.h> #include <linux/export.h> #include <linux/hardirq.h> #include <linux/delay.h> #include <linux/module.h> #define CREATE_TRACE_POINTS #include <trace/events/rcu.h> #include "rcu.h" module_param(rcu_expedited, int, 0); #ifdef CONFIG_PREEMPT_RCU /* * Preemptible RCU implementation for rcu_read_lock(). * Just increment ->rcu_read_lock_nesting, shared state will be updated * if we block. */ void __rcu_read_lock(void) { current->rcu_read_lock_nesting++; barrier(); /* critical section after entry code. */ } EXPORT_SYMBOL_GPL(__rcu_read_lock); /* * Preemptible RCU implementation for rcu_read_unlock(). * Decrement ->rcu_read_lock_nesting. If the result is zero (outermost * rcu_read_unlock()) and ->rcu_read_unlock_special is non-zero, then * invoke rcu_read_unlock_special() to clean up after a context switch * in an RCU read-side critical section and other special cases. */ void __rcu_read_unlock(void) { struct task_struct *t = current; if (t->rcu_read_lock_nesting != 1) { --t->rcu_read_lock_nesting; } else { barrier(); /* critical section before exit code. */ t->rcu_read_lock_nesting = INT_MIN; #ifdef CONFIG_PROVE_RCU_DELAY udelay(10); /* Make preemption more probable. */ #endif /* #ifdef CONFIG_PROVE_RCU_DELAY */ barrier(); /* assign before ->rcu_read_unlock_special load */ if (unlikely(ACCESS_ONCE(t->rcu_read_unlock_special))) rcu_read_unlock_special(t); barrier(); /* ->rcu_read_unlock_special load before assign */ t->rcu_read_lock_nesting = 0; } #ifdef CONFIG_PROVE_LOCKING { int rrln = ACCESS_ONCE(t->rcu_read_lock_nesting); WARN_ON_ONCE(rrln < 0 && rrln > INT_MIN / 2); } #endif /* #ifdef CONFIG_PROVE_LOCKING */ } EXPORT_SYMBOL_GPL(__rcu_read_unlock); /* * Check for a task exiting while in a preemptible-RCU read-side * critical section, clean up if so. No need to issue warnings, * as debug_check_no_locks_held() already does this if lockdep * is enabled. */ void exit_rcu(void) { struct task_struct *t = current; if (likely(list_empty(&current->rcu_node_entry))) return; t->rcu_read_lock_nesting = 1; barrier(); t->rcu_read_unlock_special = RCU_READ_UNLOCK_BLOCKED; __rcu_read_unlock(); } #else /* #ifdef CONFIG_PREEMPT_RCU */ void exit_rcu(void) { } #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key rcu_lock_key; struct lockdep_map rcu_lock_map =


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