Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 258 insertions, 0 deletions

diff --git a/include/asm-parisc/spinlock.h b/include/asm-parisc/spinlock.h
new file mode 100644
index 0000000..679ea1c
--- /dev/null
+++ b/include/asm-parisc/spinlock.h
@@ -0,0 +1,258 @@
+#ifndef __ASM_SPINLOCK_H
+#define __ASM_SPINLOCK_H
+
+#include <asm/system.h>
+
+/* Note that PA-RISC has to use `1' to mean unlocked and `0' to mean locked
+ * since it only has load-and-zero. Moreover, at least on some PA processors,
+ * the semaphore address has to be 16-byte aligned.
+ */
+
+#ifndef CONFIG_DEBUG_SPINLOCK
+
+#define __SPIN_LOCK_UNLOCKED	{ { 1, 1, 1, 1 } }
+#undef SPIN_LOCK_UNLOCKED
+#define SPIN_LOCK_UNLOCKED (spinlock_t) __SPIN_LOCK_UNLOCKED
+
+#define spin_lock_init(x)	do { *(x) = SPIN_LOCK_UNLOCKED; } while(0)
+
+static inline int spin_is_locked(spinlock_t *x)
+{
+	volatile unsigned int *a = __ldcw_align(x);
+	return *a == 0;
+}
+
+#define spin_unlock_wait(x)	do { barrier(); } while(spin_is_locked(x))
+#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
+
+static inline void _raw_spin_lock(spinlock_t *x)
+{
+	volatile unsigned int *a;
+
+	mb();
+	a = __ldcw_align(x);
+	while (__ldcw(a) == 0)
+		while (*a == 0);
+	mb();
+}
+
+static inline void _raw_spin_unlock(spinlock_t *x)
+{
+	volatile unsigned int *a;
+	mb();
+	a = __ldcw_align(x);
+	*a = 1;
+	mb();
+}
+
+static inline int _raw_spin_trylock(spinlock_t *x)
+{
+	volatile unsigned int *a;
+	int ret;
+
+	mb();
+	a = __ldcw_align(x);
+        ret = __ldcw(a) != 0;
+	mb();
+
+	return ret;
+}
+	
+#define spin_lock_own(LOCK, LOCATION)	((void)0)
+
+#else /* !(CONFIG_DEBUG_SPINLOCK) */
+
+#define SPINLOCK_MAGIC	0x1D244B3C
+
+#define __SPIN_LOCK_UNLOCKED	{ { 1, 1, 1, 1 }, SPINLOCK_MAGIC, 10, __FILE__ , NULL, 0, -1, NULL, NULL }
+#undef SPIN_LOCK_UNLOCKED
+#define SPIN_LOCK_UNLOCKED (spinlock_t) __SPIN_LOCK_UNLOCKED
+
+#define spin_lock_init(x)	do { *(x) = SPIN_LOCK_UNLOCKED; } while(0)
+
+#define CHECK_LOCK(x)							\
+	do {								\
+	 	if (unlikely((x)->magic != SPINLOCK_MAGIC)) {			\
+			printk(KERN_ERR "%s:%d: spin_is_locked"		\
+			" on uninitialized spinlock %p.\n",		\
+				__FILE__, __LINE__, (x)); 		\
+		} 							\
+	} while(0)
+
+#define spin_is_locked(x)						\
+	({								\
+	 	CHECK_LOCK(x);						\
+		volatile unsigned int *a = __ldcw_align(x);		\
+		if (unlikely((*a == 0) && (x)->babble)) {				\
+			(x)->babble--;					\
+			printk("KERN_WARNING				\
+				%s:%d: spin_is_locked(%s/%p) already"	\
+				" locked by %s:%d in %s at %p(%d)\n",	\
+				__FILE__,__LINE__, (x)->module,	(x),	\
+				(x)->bfile, (x)->bline, (x)->task->comm,\
+				(x)->previous, (x)->oncpu);		\
+		}							\
+		*a == 0;						\
+	})
+
+#define spin_unlock_wait(x)						\
+	do {								\
+	 	CHECK_LOCK(x);						\
+		volatile unsigned int *a = __ldcw_align(x);		\
+		if (unlikely((*a == 0) && (x)->babble)) {				\
+			(x)->babble--;					\
+			printk("KERN_WARNING				\
+				%s:%d: spin_unlock_wait(%s/%p)"		\
+				" owned by %s:%d in %s at %p(%d)\n",	\
+				__FILE__,__LINE__, (x)->module, (x),	\
+				(x)->bfile, (x)->bline, (x)->task->comm,\
+				(x)->previous, (x)->oncpu);		\
+		}							\
+		barrier();						\
+	} while (*((volatile unsigned char *)(__ldcw_align(x))) == 0)
+
+extern void _dbg_spin_lock(spinlock_t *lock, const char *base_file, int line_no);
+extern void _dbg_spin_unlock(spinlock_t *lock, const char *, int);
+extern int _dbg_spin_trylock(spinlock_t * lock, const char *, int);
+
+#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
+
+#define _raw_spin_unlock(lock)	_dbg_spin_unlock(lock, __FILE__, __LINE__)
+#define _raw_spin_lock(lock) _dbg_spin_lock(lock, __FILE__, __LINE__)
+#define _raw_spin_trylock(lock) _dbg_spin_trylock(lock, __FILE__, __LINE__)
+
+/* just in case we need it */
+#define spin_lock_own(LOCK, LOCATION)					\
+do {									\
+	volatile unsigned int *a = __ldcw_align(LOCK);			\
+	if (!((*a == 0) && ((LOCK)->oncpu == smp_processor_id())))	\
+		printk("KERN_WARNING					\
+			%s: called on %d from %p but lock %s on %d\n",	\
+			LOCATION, smp_processor_id(),			\
+			__builtin_return_address(0),			\
+			(*a == 0) ? "taken" : "freed", (LOCK)->on_cpu);	\
+} while (0)
+
+#endif /* !(CONFIG_DEBUG_SPINLOCK) */
+
+/*
+ * Read-write spinlocks, allowing multiple readers
+ * but only one writer.
+ */
+typedef struct {
+	spinlock_t lock;
+	volatile int counter;
+#ifdef CONFIG_PREEMPT
+	unsigned int break_lock;
+#endif
+} rwlock_t;
+
+#define RW_LOCK_UNLOCKED (rwlock_t) { __SPIN_LOCK_UNLOCKED, 0 }
+
+#define rwlock_init(lp)	do { *(lp) = RW_LOCK_UNLOCKED; } while (0)
+
+#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
+
+/* read_lock, read_unlock are pretty straightforward.  Of course it somehow
+ * sucks we end up saving/restoring flags twice for read_lock_irqsave aso. */
+
+#ifdef CONFIG_DEBUG_RWLOCK
+extern void _dbg_read_lock(rwlock_t * rw, const char *bfile, int bline);
+#define _raw_read_lock(rw) _dbg_read_lock(rw, __FILE__, __LINE__)
+#else
+static  __inline__ void _raw_read_lock(rwlock_t *rw)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	_raw_spin_lock(&rw->lock); 
+
+	rw->counter++;
+
+	_raw_spin_unlock(&rw->lock);
+	local_irq_restore(flags);
+}
+#endif	/* CONFIG_DEBUG_RWLOCK */
+
+static  __inline__ void _raw_read_unlock(rwlock_t *rw)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	_raw_spin_lock(&rw->lock); 
+
+	rw->counter--;
+
+	_raw_spin_unlock(&rw->lock);
+	local_irq_restore(flags);
+}
+
+/* write_lock is less trivial.  We optimistically grab the lock and check
+ * if we surprised any readers.  If so we release the lock and wait till
+ * they're all gone before trying again
+ *
+ * Also note that we don't use the _irqsave / _irqrestore suffixes here.
+ * If we're called with interrupts enabled and we've got readers (or other
+ * writers) in interrupt handlers someone fucked up and we'd dead-lock
+ * sooner or later anyway.   prumpf */
+
+#ifdef CONFIG_DEBUG_RWLOCK
+extern void _dbg_write_lock(rwlock_t * rw, const char *bfile, int bline);
+#define _raw_write_lock(rw) _dbg_write_lock(rw, __FILE__, __LINE__)
+#else
+static  __inline__ void _raw_write_lock(rwlock_t *rw)
+{
+retry:
+	_raw_spin_lock(&rw->lock);
+
+	if(rw->counter != 0) {
+		/* this basically never happens */
+		_raw_spin_unlock(&rw->lock);
+
+		while(rw->counter != 0);
+
+		goto retry;
+	}
+
+	/* got it.  now leave without unlocking */
+	rw->counter = -1; /* remember we are locked */
+}
+#endif /* CONFIG_DEBUG_RWLOCK */
+
+/* write_unlock is absolutely trivial - we don't have to wait for anything */
+
+static  __inline__ void _raw_write_unlock(rwlock_t *rw)
+{
+	rw->counter = 0;
+	_raw_spin_unlock(&rw->lock);
+}
+
+#ifdef CONFIG_DEBUG_RWLOCK
+extern int _dbg_write_trylock(rwlock_t * rw, const char *bfile, int bline);
+#define _raw_write_trylock(rw) _dbg_write_trylock(rw, __FILE__, __LINE__)
+#else
+static  __inline__ int _raw_write_trylock(rwlock_t *rw)
+{
+	_raw_spin_lock(&rw->lock);
+	if (rw->counter != 0) {
+		/* this basically never happens */
+		_raw_spin_unlock(&rw->lock);
+
+		return 0;
+	}
+
+	/* got it.  now leave without unlocking */
+	rw->counter = -1; /* remember we are locked */
+	return 1;
+}
+#endif /* CONFIG_DEBUG_RWLOCK */
+
+static __inline__ int is_read_locked(rwlock_t *rw)
+{
+	return rw->counter > 0;
+}
+
+static __inline__ int is_write_locked(rwlock_t *rw)
+{
+	return rw->counter < 0;
+}
+
+#endif /* __ASM_SPINLOCK_H */