[PATCH] read_can_lock and write_can_lock for MIPS

[Manish Lachwani <mlachwani@mvista.com>]

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Hi Ralf,

With SMP+PREEMPT, read_can_lock() and write_can_lock() need to be defined. Attached
patch does this. Please review.

Thanks
Manish Lachwani

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Index: linux/include/asm-mips/spinlock.h
===================================================================
--- linux.orig/include/asm-mips/spinlock.h
+++ linux/include/asm-mips/spinlock.h
@@ -140,6 +140,9 @@
 
 #define rwlock_init(x)  do { *(x) = RW_LOCK_UNLOCKED; } while(0)
 
+#define read_can_lock(rw)	((rw)->lock >= 0)
+#define write_can_lock(rw)	(!(rw)->lock)
+
 static inline void _raw_read_lock(rwlock_t *rw)
 {
 	unsigned int tmp;