[PATCH] _raw_read_trylock bias

[Hugh Dickins]

The i386 and x86_64 _raw_read_trylocks in preempt-smp.patch
are too successful: atomic_read() returns a signed integer.

Signed-off-by: Hugh Dickins <hugh@xxxxxxxxxxx>

--- 2.6.9-rc3-mm2/include/asm-i386/spinlock.h	2004-10-04 12:00:14.000000000 +0100
+++ linux/include/asm-i386/spinlock.h	2004-10-04 18:50:32.752864600 +0100
@@ -235,7 +235,7 @@ static inline int _raw_read_trylock(rwlo
 {
 	atomic_t *count = (atomic_t *)lock;
 	atomic_dec(count);
-	if (atomic_read(count) < RW_LOCK_BIAS)
+	if (atomic_read(count) >= 0)
 		return 1;
 	atomic_inc(count);
 	return 0;
--- 2.6.9-rc3-mm2/include/asm-x86_64/spinlock.h	2004-10-04 12:00:15.000000000 +0100
+++ linux/include/asm-x86_64/spinlock.h	2004-10-04 18:50:32.752864600 +0100
@@ -236,7 +236,7 @@ static inline int _raw_read_trylock(rwlo
 {
 	atomic_t *count = (atomic_t *)lock;
 	atomic_dec(count);
-	if (atomic_read(count) < RW_LOCK_BIAS)
+	if (atomic_read(count) >= 0)
 		return 1;
 	atomic_inc(count);
 	return 0;

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