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Date: Sun, 2 Aug 2009 19:41:05 +0100
From: David Kilroy <kilroyd@...glemail.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org,
David Kilroy <kilroyd@...glemail.com>
Subject: [PATCH v3] locking: check spinlock_t/rwlock_t argument type on non-SMP builds too
When writing code for UP without CONFIG_DEBUG_SPINLOCK it's
easy to get the first argument to the spinlock/rwlock functions
wrong. This is because the parameter is not actually used in
this configuration.
Typically you will only find out it's wrong:
* by rebuilding with CONFIG_SMP or CONFIG_DEBUG_SPINLOCK
* after you've submitted your beautiful patch series.
The first means a long wait, and the latter is a bit late.
Change the intermediate macros into inline functions.
Signed-off-by: David Kilroy <kilroyd@...glemail.com>
---
Updates since v2:
* Correct bug in _spin_trylock_bh
---
include/linux/spinlock.h | 6 +-
include/linux/spinlock_api_up.h | 118 +++++++++++++++++++++++++++++----------
2 files changed, 92 insertions(+), 32 deletions(-)
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 4be57ab..3dd492f 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -249,17 +249,17 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#define spin_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
- _spin_lock_irqsave(lock, flags); \
+ _spin_lock_irqsave(lock, &flags); \
} while (0)
#define read_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
- _read_lock_irqsave(lock, flags); \
+ _read_lock_irqsave(lock, &flags); \
} while (0)
#define write_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
- _write_lock_irqsave(lock, flags); \
+ _write_lock_irqsave(lock, &flags); \
} while (0)
#define spin_lock_irqsave_nested(lock, flags, subclass) \
spin_lock_irqsave(lock, flags)
diff --git a/include/linux/spinlock_api_up.h b/include/linux/spinlock_api_up.h
index 04e1d31..432d4b6 100644
--- a/include/linux/spinlock_api_up.h
+++ b/include/linux/spinlock_api_up.h
@@ -48,34 +48,94 @@
#define __UNLOCK_IRQRESTORE(lock, flags) \
do { local_irq_restore(flags); __UNLOCK(lock); } while (0)
-#define _spin_lock(lock) __LOCK(lock)
-#define _spin_lock_nested(lock, subclass) __LOCK(lock)
-#define _read_lock(lock) __LOCK(lock)
-#define _write_lock(lock) __LOCK(lock)
-#define _spin_lock_bh(lock) __LOCK_BH(lock)
-#define _read_lock_bh(lock) __LOCK_BH(lock)
-#define _write_lock_bh(lock) __LOCK_BH(lock)
-#define _spin_lock_irq(lock) __LOCK_IRQ(lock)
-#define _read_lock_irq(lock) __LOCK_IRQ(lock)
-#define _write_lock_irq(lock) __LOCK_IRQ(lock)
-#define _spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
-#define _read_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
-#define _write_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
-#define _spin_trylock(lock) ({ __LOCK(lock); 1; })
-#define _read_trylock(lock) ({ __LOCK(lock); 1; })
-#define _write_trylock(lock) ({ __LOCK(lock); 1; })
-#define _spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; })
-#define _spin_unlock(lock) __UNLOCK(lock)
-#define _read_unlock(lock) __UNLOCK(lock)
-#define _write_unlock(lock) __UNLOCK(lock)
-#define _spin_unlock_bh(lock) __UNLOCK_BH(lock)
-#define _write_unlock_bh(lock) __UNLOCK_BH(lock)
-#define _read_unlock_bh(lock) __UNLOCK_BH(lock)
-#define _spin_unlock_irq(lock) __UNLOCK_IRQ(lock)
-#define _read_unlock_irq(lock) __UNLOCK_IRQ(lock)
-#define _write_unlock_irq(lock) __UNLOCK_IRQ(lock)
-#define _spin_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags)
-#define _read_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags)
-#define _write_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags)
+static inline void _spin_lock(spinlock_t *lock)
+{ __LOCK(lock); }
+
+static inline void _spin_lock_nested(spinlock_t *lock, int subclass)
+{ __LOCK(lock); }
+
+static inline void _read_lock(rwlock_t *lock)
+{ __LOCK(lock); }
+
+static inline void _write_lock(rwlock_t *lock)
+{ __LOCK(lock); }
+
+static inline void _spin_lock_bh(spinlock_t *lock)
+{ __LOCK_BH(lock); }
+
+static inline void _read_lock_bh(rwlock_t *lock)
+{ __LOCK_BH(lock); }
+
+static inline void _write_lock_bh(rwlock_t *lock)
+{ __LOCK_BH(lock); }
+
+static inline void _spin_lock_irq(spinlock_t *lock)
+{ __LOCK_IRQ(lock); }
+
+static inline void _read_lock_irq(rwlock_t *lock)
+{ __LOCK_IRQ(lock); }
+
+static inline void _write_lock_irq(rwlock_t *lock)
+{ __LOCK_IRQ(lock); }
+
+static inline void _spin_lock_irqsave(spinlock_t *lock, unsigned long *flags)
+{ __LOCK_IRQSAVE(lock, *flags); }
+
+static inline void _read_lock_irqsave(rwlock_t *lock, unsigned long *flags)
+{ __LOCK_IRQSAVE(lock, *flags); }
+
+static inline void _write_lock_irqsave(rwlock_t *lock, unsigned long *flags)
+{ __LOCK_IRQSAVE(lock, *flags); }
+
+static inline int _spin_trylock(spinlock_t *lock)
+{ __LOCK(lock); return 1; }
+
+static inline int _read_trylock(rwlock_t *lock)
+{ __LOCK(lock); return 1; }
+
+static inline int _write_trylock(rwlock_t *lock)
+{ __LOCK(lock); return 1; }
+
+static inline int _spin_trylock_bh(spinlock_t *lock)
+{ __LOCK_BH(lock); return 1; }
+
+static inline void _spin_unlock(spinlock_t *lock)
+{ __UNLOCK(lock); }
+
+static inline void _read_unlock(rwlock_t *lock)
+{ __UNLOCK(lock); }
+
+static inline void _write_unlock(rwlock_t *lock)
+{ __UNLOCK(lock); }
+
+static inline void _spin_unlock_bh(spinlock_t *lock)
+{ __UNLOCK_BH(lock); }
+
+static inline void _read_unlock_bh(rwlock_t *lock)
+{ __UNLOCK_BH(lock); }
+
+static inline void _write_unlock_bh(rwlock_t *lock)
+{ __UNLOCK_BH(lock); }
+
+static inline void _spin_unlock_irq(spinlock_t *lock)
+{ __UNLOCK_IRQ(lock); }
+
+static inline void _read_unlock_irq(rwlock_t *lock)
+{ __UNLOCK_IRQ(lock); }
+
+static inline void _write_unlock_irq(rwlock_t *lock)
+{ __UNLOCK_IRQ(lock); }
+
+static inline void _spin_unlock_irqrestore(spinlock_t *lock,
+ unsigned long flags)
+{ __UNLOCK_IRQRESTORE(lock, flags); }
+
+static inline void _read_unlock_irqrestore(rwlock_t *lock,
+ unsigned long flags)
+{ __UNLOCK_IRQRESTORE(lock, flags); }
+
+static inline void _write_unlock_irqrestore(rwlock_t *lock,
+ unsigned long flags)
+{ __UNLOCK_IRQRESTORE(lock, flags); }
#endif /* __LINUX_SPINLOCK_API_UP_H */
--
1.6.3.3
--
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