linux-kernel - Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest

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Message-Id: <1218108345.8625.23.camel@twins>
Date:	Thu, 07 Aug 2008 13:25:45 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, jeremy@...p.org,
	hugh@...itas.com, mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, davej@...hat.com
Subject: Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock()

Please fold (or tell me to provide a new patch)


Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
diff -u linux-2.6/include/linux/spinlock.h linux-2.6/include/linux/spinlock.h
--- linux-2.6/include/linux/spinlock.h
+++ linux-2.6/include/linux/spinlock.h
@@ -185,8 +185,8 @@
 # define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
 # define spin_lock_nest_lock(lock, nest_lock)				\
 	 do {								\
-		 typecheck(struct lockdep_map *, &nest_lock->dep_map);	\
-		 _spin_lock_nest_lock(lock, &nest_lock->dep_map);	\
+		 typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
+		 _spin_lock_nest_lock(lock, &(nest_lock)->dep_map);	\
 	 } while (0)
 #else
 # define spin_lock_nested(lock, subclass) _spin_lock(lock)
diff -u linux-2.6/kernel/spinlock.c linux-2.6/kernel/spinlock.c
--- linux-2.6/kernel/spinlock.c
+++ linux-2.6/kernel/spinlock.c
@@ -323,7 +323,7 @@
 	LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
 }
 
-EXPORT_SYMBOL(_spin_lock_nest_lock)
+EXPORT_SYMBOL(_spin_lock_nest_lock);
 
 #endif
 
--- linux-2.6.orig/include/linux/spinlock_api_smp.h
+++ linux-2.6/include/linux/spinlock_api_smp.h
@@ -22,6 +22,8 @@ int in_lock_functions(unsigned long addr
 void __lockfunc _spin_lock(spinlock_t *lock)		__acquires(lock);
 void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
 							__acquires(lock);
+void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map)
+							__acquires(lock);
 void __lockfunc _read_lock(rwlock_t *lock)		__acquires(lock);
 void __lockfunc _write_lock(rwlock_t *lock)		__acquires(lock);
 void __lockfunc _spin_lock_bh(spinlock_t *lock)		__acquires(lock);





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