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Commit 4e3eaddd authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'core-fixes-for-linus' of... 

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  locking: Make sparse work with inline spinlocks and rwlocks
  x86/mce: Fix RCU lockdep splats
  rcu: Increase RCU CPU stall timeouts if PROVE_RCU
  ftrace: Replace read_barrier_depends() with rcu_dereference_raw()
  rcu: Suppress RCU lockdep warnings during early boot
  rcu, ftrace: Fix RCU lockdep splat in ftrace_perf_buf_prepare()
  rcu: Suppress __mpol_dup() false positive from RCU lockdep
  rcu: Make rcu_read_lock_sched_held() handle !PREEMPT
  rcu: Add control variables to lockdep_rcu_dereference() diagnostics
  rcu, cgroup: Relax the check in task_subsys_state() as early boot is now handled by lockdep-RCU
  rcu: Use wrapper function instead of exporting tasklist_lock
  sched, rcu: Fix rcu_dereference() for RCU-lockdep
  rcu: Make task_subsys_state() RCU-lockdep checks handle boot-time use
  rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU
  x86/gart: Unexport gart_iommu_aperture

Fix trivial conflicts in kernel/trace/ftrace.c
parents 8655e7e3 b97c4bc1

arch/x86/kernel/aperture_64.c

+0 −1
Original line number Diff line number Diff line
@@ -31,7 +31,6 @@ 
#include <asm/x86_init.h>



int gart_iommu_aperture;

EXPORT_SYMBOL_GPL(gart_iommu_aperture);

int gart_iommu_aperture_disabled __initdata;

int gart_iommu_aperture_allowed __initdata;

arch/x86/kernel/cpu/mcheck/mce.c

+8 −3
Original line number Diff line number Diff line
@@ -46,6 +46,11 @@ 


#include "mce-internal.h"



#define rcu_dereference_check_mce(p) \

	rcu_dereference_check((p), \

			      rcu_read_lock_sched_held() || \

			      lockdep_is_held(&mce_read_mutex))



#define CREATE_TRACE_POINTS

#include <trace/events/mce.h>
@@ -158,7 +163,7 @@ void mce_log(struct mce *mce) 
	mce->finished = 0;

	wmb();

	for (;;) {

		entry = rcu_dereference(mcelog.next);

		entry = rcu_dereference_check_mce(mcelog.next);

		for (;;) {

			/*

			 * When the buffer fills up discard new entries.
@@ -1500,7 +1505,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, 
		return -ENOMEM;



	mutex_lock(&mce_read_mutex);

	next = rcu_dereference(mcelog.next);

	next = rcu_dereference_check_mce(mcelog.next);



	/* Only supports full reads right now */

	if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
@@ -1565,7 +1570,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, 
static unsigned int mce_poll(struct file *file, poll_table *wait)

{

	poll_wait(file, &mce_wait, wait);

	if (rcu_dereference(mcelog.next))

	if (rcu_dereference_check_mce(mcelog.next))

		return POLLIN | POLLRDNORM;

	return 0;

}

include/linux/cred.h

+1 −1
Original line number Diff line number Diff line
@@ -280,7 +280,7 @@ static inline void put_cred(const struct cred *_cred) 
 * task or by holding tasklist_lock to prevent it from being unlinked.

 */

#define __task_cred(task) \

	((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock))))

	((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_tasklist_lock_is_held())))



/**

 * get_task_cred - Get another task's objective credentials

include/linux/rcupdate.h

+36 −9
Original line number Diff line number Diff line
@@ -101,6 +101,11 @@ extern struct lockdep_map rcu_sched_lock_map; 
# define rcu_read_release_sched() \

		lock_release(&rcu_sched_lock_map, 1, _THIS_IP_)



static inline int debug_lockdep_rcu_enabled(void)

{

	return likely(rcu_scheduler_active && debug_locks);

}



/**

 * rcu_read_lock_held - might we be in RCU read-side critical section?

 *
@@ -108,12 +113,14 @@ extern struct lockdep_map rcu_sched_lock_map; 
 * an RCU read-side critical section.  In absence of CONFIG_PROVE_LOCKING,

 * this assumes we are in an RCU read-side critical section unless it can

 * prove otherwise.

 *

 * Check rcu_scheduler_active to prevent false positives during boot.

 */

static inline int rcu_read_lock_held(void)

{

	if (debug_locks)

		return lock_is_held(&rcu_lock_map);

	if (!debug_lockdep_rcu_enabled())

		return 1;

	return lock_is_held(&rcu_lock_map);

}



/**
@@ -123,12 +130,14 @@ static inline int rcu_read_lock_held(void) 
 * an RCU-bh read-side critical section.  In absence of CONFIG_PROVE_LOCKING,

 * this assumes we are in an RCU-bh read-side critical section unless it can

 * prove otherwise.

 *

 * Check rcu_scheduler_active to prevent false positives during boot.

 */

static inline int rcu_read_lock_bh_held(void)

{

	if (debug_locks)

		return lock_is_held(&rcu_bh_lock_map);

	if (!debug_lockdep_rcu_enabled())

		return 1;

	return lock_is_held(&rcu_bh_lock_map);

}



/**
@@ -139,15 +148,26 @@ static inline int rcu_read_lock_bh_held(void) 
 * this assumes we are in an RCU-sched read-side critical section unless it

 * can prove otherwise.  Note that disabling of preemption (including

 * disabling irqs) counts as an RCU-sched read-side critical section.

 *

 * Check rcu_scheduler_active to prevent false positives during boot.

 */

#ifdef CONFIG_PREEMPT

static inline int rcu_read_lock_sched_held(void)

{

	int lockdep_opinion = 0;



	if (!debug_lockdep_rcu_enabled())

		return 1;

	if (debug_locks)

		lockdep_opinion = lock_is_held(&rcu_sched_lock_map);

	return lockdep_opinion || preempt_count() != 0 || !rcu_scheduler_active;

	return lockdep_opinion || preempt_count() != 0;

}

#else /* #ifdef CONFIG_PREEMPT */

static inline int rcu_read_lock_sched_held(void)

{

	return 1;

}

#endif /* #else #ifdef CONFIG_PREEMPT */



#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -168,10 +188,17 @@ static inline int rcu_read_lock_bh_held(void) 
	return 1;

}



#ifdef CONFIG_PREEMPT

static inline int rcu_read_lock_sched_held(void)

{

	return preempt_count() != 0 || !rcu_scheduler_active;

	return !rcu_scheduler_active || preempt_count() != 0;

}

#else /* #ifdef CONFIG_PREEMPT */

static inline int rcu_read_lock_sched_held(void)

{

	return 1;

}

#endif /* #else #ifdef CONFIG_PREEMPT */



#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -188,7 +215,7 @@ static inline int rcu_read_lock_sched_held(void) 
 */

#define rcu_dereference_check(p, c) \

	({ \

		if (debug_locks && !(c)) \

		if (debug_lockdep_rcu_enabled() && !(c)) \

			lockdep_rcu_dereference(__FILE__, __LINE__); \

		rcu_dereference_raw(p); \

	})

include/linux/rwlock.h

+10 −10
Original line number Diff line number Diff line
@@ -29,25 +29,25 @@ do { \ 
#endif



#ifdef CONFIG_DEBUG_SPINLOCK

 extern void do_raw_read_lock(rwlock_t *lock);

 extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);

#define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock)

 extern int do_raw_read_trylock(rwlock_t *lock);

 extern void do_raw_read_unlock(rwlock_t *lock);

 extern void do_raw_write_lock(rwlock_t *lock);

 extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);

 extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);

#define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock)

 extern int do_raw_write_trylock(rwlock_t *lock);

 extern void do_raw_write_unlock(rwlock_t *lock);

 extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);

#else

# define do_raw_read_lock(rwlock)	arch_read_lock(&(rwlock)->raw_lock)

# define do_raw_read_lock(rwlock)	do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)

# define do_raw_read_lock_flags(lock, flags) \

		arch_read_lock_flags(&(lock)->raw_lock, *(flags))

		do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)

# define do_raw_read_trylock(rwlock)	arch_read_trylock(&(rwlock)->raw_lock)

# define do_raw_read_unlock(rwlock)	arch_read_unlock(&(rwlock)->raw_lock)

# define do_raw_write_lock(rwlock)	arch_write_lock(&(rwlock)->raw_lock)

# define do_raw_read_unlock(rwlock)	do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)

# define do_raw_write_lock(rwlock)	do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)

# define do_raw_write_lock_flags(lock, flags) \

		arch_write_lock_flags(&(lock)->raw_lock, *(flags))

		do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)

# define do_raw_write_trylock(rwlock)	arch_write_trylock(&(rwlock)->raw_lock)

# define do_raw_write_unlock(rwlock)	arch_write_unlock(&(rwlock)->raw_lock)

# define do_raw_write_unlock(rwlock)	do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)

#endif



#define read_can_lock(rwlock)		arch_read_can_lock(&(rwlock)->raw_lock)