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Commit 322efba5 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

Merge branches 'doc.2014.02.24a', 'fixes.2014.02.26a' and 'rt.2014.02.17b' into HEAD 

doc.2014.02.24a: Documentation changes
fixes.2014.02.26a: Miscellaneous fixes
rt.2014.02.17b: Response-time-related changes
parents 8dd853d7 5cb5c6e1 f1f399d1

fs/file.c

+1 −1
Original line number Diff line number Diff line
@@ -497,7 +497,7 @@ int __alloc_fd(struct files_struct *files, 
	error = fd;

#if 1

	/* Sanity check */

	if (rcu_dereference_raw(fdt->fd[fd]) != NULL) {

	if (rcu_access_pointer(fdt->fd[fd]) != NULL) {

		printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd);

		rcu_assign_pointer(fdt->fd[fd], NULL);

	}

include/linux/rculist.h

+9 −8
Original line number Diff line number Diff line
@@ -247,7 +247,8 @@ static inline void list_splice_init_rcu(struct list_head *list, 
 * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().

 */

#define list_entry_rcu(ptr, type, member) \

	({typeof (*ptr) __rcu *__ptr = (typeof (*ptr) __rcu __force *)ptr; \

({ \

	typeof(*ptr) __rcu *__ptr = (typeof(*ptr) __rcu __force *)ptr; \

	container_of((typeof(ptr))rcu_dereference_raw(__ptr), type, member); \

})
@@ -285,10 +286,10 @@ static inline void list_splice_init_rcu(struct list_head *list, 
 * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().

 */

#define list_first_or_null_rcu(ptr, type, member) \

	({struct list_head *__ptr = (ptr); \

({ \

	struct list_head *__ptr = (ptr); \

	struct list_head *__next = ACCESS_ONCE(__ptr->next); \

	  likely(__ptr != __next) ? \

		list_entry_rcu(__next, type, member) : NULL; \

	likely(__ptr != __next) ? list_entry_rcu(__next, type, member) : NULL; \

})



/**

include/linux/rcupdate.h

+48 −46
Original line number Diff line number Diff line
@@ -12,8 +12,8 @@ 
 * 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.

 * along with this program; if not, you can access it online at

 * http://www.gnu.org/licenses/gpl-2.0.html.

 *

 * Copyright IBM Corporation, 2001

 *
@@ -44,7 +44,9 @@ 
#include <linux/debugobjects.h>

#include <linux/bug.h>

#include <linux/compiler.h>

#include <asm/barrier.h>



extern int rcu_expedited; /* for sysctl */

#ifdef CONFIG_RCU_TORTURE_TEST

extern int rcutorture_runnable; /* for sysctl */

#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
@@ -479,11 +481,9 @@ static inline void rcu_preempt_sleep_check(void) 
	do {								\

		rcu_preempt_sleep_check();				\

		rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map),	\

				   "Illegal context switch in RCU-bh"	\

				   " read-side critical section");	\

				   "Illegal context switch in RCU-bh read-side critical section"); \

		rcu_lockdep_assert(!lock_is_held(&rcu_sched_lock_map),	\

				   "Illegal context switch in RCU-sched"\

				   " read-side critical section");	\

				   "Illegal context switch in RCU-sched read-side critical section"); \

	} while (0)



#else /* #ifdef CONFIG_PROVE_RCU */
@@ -518,16 +518,14 @@ static inline void rcu_preempt_sleep_check(void) 
#define __rcu_dereference_check(p, c, space) \

({ \

	typeof(*p) *_________p1 = (typeof(*p) *__force)ACCESS_ONCE(p); \

		rcu_lockdep_assert(c, "suspicious rcu_dereference_check()" \

				      " usage"); \

	rcu_lockdep_assert(c, "suspicious rcu_dereference_check() usage"); \

	rcu_dereference_sparse(p, space); \

		smp_read_barrier_depends(); \

	smp_read_barrier_depends(); /* Dependency order vs. p above. */ \

	((typeof(*p) __force __kernel *)(_________p1)); \

})

#define __rcu_dereference_protected(p, c, space) \

({ \

		rcu_lockdep_assert(c, "suspicious rcu_dereference_protected()" \

				      " usage"); \

	rcu_lockdep_assert(c, "suspicious rcu_dereference_protected() usage"); \

	rcu_dereference_sparse(p, space); \

	((typeof(*p) __force __kernel *)(p)); \

})
@@ -542,9 +540,8 @@ static inline void rcu_preempt_sleep_check(void) 
({ \

	typeof(p) _________p1 = ACCESS_ONCE(p); \

	rcu_lockdep_assert(c, \

				   "suspicious rcu_dereference_index_check()" \

				   " usage"); \

		smp_read_barrier_depends(); \

			   "suspicious rcu_dereference_index_check() usage"); \

	smp_read_barrier_depends(); /* Dependency order vs. p above. */ \

	(_________p1); \

})
@@ -585,12 +582,7 @@ static inline void rcu_preempt_sleep_check(void) 
 * please be careful when making changes to rcu_assign_pointer() and the

 * other macros that it invokes.

 */

#define rcu_assign_pointer(p, v) \

	do { \

		smp_wmb(); \

		ACCESS_ONCE(p) = RCU_INITIALIZER(v); \

	} while (0)



#define rcu_assign_pointer(p, v) smp_store_release(&p, RCU_INITIALIZER(v))



/**

 * rcu_access_pointer() - fetch RCU pointer with no dereferencing
@@ -1015,11 +1007,21 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) 
#define kfree_rcu(ptr, rcu_head)					\

	__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))



#ifdef CONFIG_RCU_NOCB_CPU

#if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL)

static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)

{

	*delta_jiffies = ULONG_MAX;

	return 0;

}

#endif /* #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) */



#if defined(CONFIG_RCU_NOCB_CPU_ALL)

static inline bool rcu_is_nocb_cpu(int cpu) { return true; }

#elif defined(CONFIG_RCU_NOCB_CPU)

bool rcu_is_nocb_cpu(int cpu);

#else

static inline bool rcu_is_nocb_cpu(int cpu) { return false; }

#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */

#endif





/* Only for use by adaptive-ticks code. */

include/linux/rcutiny.h

+2 −8
Original line number Diff line number Diff line
@@ -12,8 +12,8 @@ 
 * 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.

 * along with this program; if not, you can access it online at

 * http://www.gnu.org/licenses/gpl-2.0.html.

 *

 * Copyright IBM Corporation, 2008

 *
@@ -68,12 +68,6 @@ static inline void kfree_call_rcu(struct rcu_head *head, 
	call_rcu(head, func);

}



static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)

{

	*delta_jiffies = ULONG_MAX;

	return 0;

}



static inline void rcu_note_context_switch(int cpu)

{

	rcu_sched_qs(cpu);

include/linux/rcutree.h

+4 −2
Original line number Diff line number Diff line
@@ -12,8 +12,8 @@ 
 * 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.

 * along with this program; if not, you can access it online at

 * http://www.gnu.org/licenses/gpl-2.0.html.

 *

 * Copyright IBM Corporation, 2008

 *
@@ -31,7 +31,9 @@ 
#define __LINUX_RCUTREE_H



void rcu_note_context_switch(int cpu);

#ifndef CONFIG_RCU_NOCB_CPU_ALL

int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies);

#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */

void rcu_cpu_stall_reset(void);



/*