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Date: Mon, 4 Mar 2013 18:17:24 -0800
From: Michel Lespinasse <walken@...gle.com>
To: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Oleg Nesterov <oleg@...hat.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
paulmck@...ux.vnet.ibm.com, Rusty Russell <rusty@...tcorp.com.au>,
rostedt@...dmis.org, tglx@...utronix.de,
Andrew Morton <akpm@...ux-foundation.org>,
Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 1/2] lockdep: introduce lock_acquire_exclusive/shared helper macros
In lockdep.h, the spinlock/mutex/rwsem/rwlock/lock_map acquire macros
have different definitions based on the value of CONFIG_PROVE_LOCKING.
We have separate ifdefs for each of these definitions, which seems
redundant.
Introduce lock_acquire_{exclusive,shared,shared_recursive} helpers
which will have different definitions based on CONFIG_PROVE_LOCKING.
Then all other helper macros can be defined based on the above ones,
which reduces the amount of ifdefined code.
Signed-off-by: Michel Lespinasse <walken@...gle.com>
---
include/linux/lockdep.h | 92 +++++++++++++------------------------------------
1 file changed, 23 insertions(+), 69 deletions(-)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index f1e877b79ed8..cfc2f119779a 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -365,7 +365,7 @@ extern void lockdep_trace_alloc(gfp_t mask);
#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
-#else /* !LOCKDEP */
+#else /* !CONFIG_LOCKDEP */
static inline void lockdep_off(void)
{
@@ -479,82 +479,36 @@ static inline void print_irqtrace_events(struct task_struct *curr)
* on the per lock-class debug mode:
*/
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# ifdef CONFIG_PROVE_LOCKING
-# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
-# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i)
-# else
-# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
-# define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i)
-# endif
-# define spin_release(l, n, i) lock_release(l, n, i)
+#ifdef CONFIG_PROVE_LOCKING
+ #define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i)
+ #define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 2, n, i)
+ #define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 2, n, i)
#else
-# define spin_acquire(l, s, t, i) do { } while (0)
-# define spin_release(l, n, i) do { } while (0)
+ #define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
+ #define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 1, n, i)
+ #define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 1, n, i)
#endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# ifdef CONFIG_PROVE_LOCKING
-# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
-# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i)
-# else
-# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
-# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i)
-# endif
-# define rwlock_release(l, n, i) lock_release(l, n, i)
-#else
-# define rwlock_acquire(l, s, t, i) do { } while (0)
-# define rwlock_acquire_read(l, s, t, i) do { } while (0)
-# define rwlock_release(l, n, i) do { } while (0)
-#endif
+#define spin_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define spin_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define spin_release(l, n, i) lock_release(l, n, i)
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# ifdef CONFIG_PROVE_LOCKING
-# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
-# define mutex_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i)
-# else
-# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
-# define mutex_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
-# endif
-# define mutex_release(l, n, i) lock_release(l, n, i)
-#else
-# define mutex_acquire(l, s, t, i) do { } while (0)
-# define mutex_acquire_nest(l, s, t, n, i) do { } while (0)
-# define mutex_release(l, n, i) do { } while (0)
-#endif
+#define rwlock_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define rwlock_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
+#define rwlock_release(l, n, i) lock_release(l, n, i)
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# ifdef CONFIG_PROVE_LOCKING
-# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i)
-# define rwsem_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i)
-# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i)
-# else
-# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i)
-# define rwsem_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
-# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i)
-# endif
+#define mutex_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define mutex_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define mutex_release(l, n, i) lock_release(l, n, i)
+
+#define rwsem_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
+#define rwsem_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
+#define rwsem_acquire_read(l, s, t, i) lock_acquire_shared(l, s, t, NULL, i)
# define rwsem_release(l, n, i) lock_release(l, n, i)
-#else
-# define rwsem_acquire(l, s, t, i) do { } while (0)
-# define rwsem_acquire_nest(l, s, t, n, i) do { } while (0)
-# define rwsem_acquire_read(l, s, t, i) do { } while (0)
-# define rwsem_release(l, n, i) do { } while (0)
-#endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# ifdef CONFIG_PROVE_LOCKING
-# define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_)
-# define lock_map_acquire_read(l) lock_acquire(l, 0, 0, 2, 2, NULL, _THIS_IP_)
-# else
-# define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_)
-# define lock_map_acquire_read(l) lock_acquire(l, 0, 0, 2, 1, NULL, _THIS_IP_)
-# endif
+#define lock_map_acquire(l) lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
+#define lock_map_acquire_read(l) lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
# define lock_map_release(l) lock_release(l, 1, _THIS_IP_)
-#else
-# define lock_map_acquire(l) do { } while (0)
-# define lock_map_acquire_read(l) do { } while (0)
-# define lock_map_release(l) do { } while (0)
-#endif
#ifdef CONFIG_PROVE_LOCKING
# define might_lock(lock) \
--
1.8.1.3
--
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