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Commit 4b32d0a4 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Linus Torvalds
Browse files

lockdep: various fixes 



 - update the copyright notices
 - use the default hash function
 - fix a thinko in a BUILD_BUG_ON
 - add a WARN_ON to spot inconsitent naming
 - fix a termination issue in /proc/lock_stat

[akpm@linux-foundation.org: cleanups]
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4fe87745

include/linux/lockdep.h

+2 −1
Original line number Diff line number Diff line 
/*

 * Runtime locking correctness validator

 *

 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>

 *

 * see Documentation/lockdep-design.txt for more details.

 */

kernel/lockdep.c

+12 −9
Original line number Diff line number Diff line
@@ -5,7 +5,8 @@ 
 *

 * Started by Ingo Molnar:

 *

 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>

 *

 * this code maps all the lock dependencies as they occur in a live kernel

 * and will warn about the following classes of locking bugs:
@@ -37,6 +38,7 @@ 
#include <linux/debug_locks.h>

#include <linux/irqflags.h>

#include <linux/utsname.h>

#include <linux/hash.h>



#include <asm/sections.h>
@@ -238,8 +240,7 @@ LIST_HEAD(all_lock_classes); 
 */

#define CLASSHASH_BITS		(MAX_LOCKDEP_KEYS_BITS - 1)

#define CLASSHASH_SIZE		(1UL << CLASSHASH_BITS)

#define CLASSHASH_MASK		(CLASSHASH_SIZE - 1)

#define __classhashfn(key)	((((unsigned long)key >> CLASSHASH_BITS) + (unsigned long)key) & CLASSHASH_MASK)

#define __classhashfn(key)	hash_long((unsigned long)key, CLASSHASH_BITS)

#define classhashentry(key)	(classhash_table + __classhashfn((key)))



static struct list_head classhash_table[CLASSHASH_SIZE];
@@ -250,9 +251,7 @@ static struct list_head classhash_table[CLASSHASH_SIZE]; 
 */

#define CHAINHASH_BITS		(MAX_LOCKDEP_CHAINS_BITS-1)

#define CHAINHASH_SIZE		(1UL << CHAINHASH_BITS)

#define CHAINHASH_MASK		(CHAINHASH_SIZE - 1)

#define __chainhashfn(chain) \

		(((chain >> CHAINHASH_BITS) + chain) & CHAINHASH_MASK)

#define __chainhashfn(chain)	hash_long(chain, CHAINHASH_BITS)

#define chainhashentry(chain)	(chainhash_table + __chainhashfn((chain)))



static struct list_head chainhash_table[CHAINHASH_SIZE];
@@ -676,7 +675,8 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) 
	 * (or spin_lock_init()) call - which acts as the key. For static

	 * locks we use the lock object itself as the key.

	 */

	BUILD_BUG_ON(sizeof(struct lock_class_key) > sizeof(struct lock_class));

	BUILD_BUG_ON(sizeof(struct lock_class_key) >

			sizeof(struct lockdep_map));



	key = lock->key->subkeys + subclass;
@@ -686,9 +686,12 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) 
	 * We can walk the hash lockfree, because the hash only

	 * grows, and we are careful when adding entries to the end:

	 */

	list_for_each_entry(class, hash_head, hash_entry)

		if (class->key == key)

	list_for_each_entry(class, hash_head, hash_entry) {

		if (class->key == key) {

			WARN_ON_ONCE(class->name != lock->name);

			return class;

		}

	}



	return NULL;

}

kernel/lockdep_proc.c

+5 −1
Original line number Diff line number Diff line
@@ -5,7 +5,8 @@ 
 *

 * Started by Ingo Molnar:

 *

 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>

 *

 * Code for /proc/lockdep and /proc/lockdep_stats:

 *
@@ -498,6 +499,9 @@ static void *ls_start(struct seq_file *m, loff_t *pos) 
	if (data->iter == data->stats)

		seq_header(m);



	if (data->iter == data->iter_end)

		data->iter = NULL;



	return data->iter;

}