Merge master.kernel.org:/home/rmk/linux-2.6-arm

* master.kernel.org:/home/rmk/linux-2.6-arm:
  [ARM] 3762/1: Fix ptrace cache coherency bug for ARM1136 VIPT nonaliasing Harvard caches
  [ARM] 3765/1: S3C24XX: cleanup include/asm-arm/arch-s3c2410/dma.h
  [ARM] 3764/1: S3C24XX: change type naming to kernel style
  [ARM] 3763/1: add both rtcs to csb337 defconfig
  [ARM] Fix ARM __raw_read_trylock() implementation
  [ARM] 3750/3: Fix double VFP emulation for EABI kernels

1 files changed, 15 insertions, 1 deletions

diff --git a/include/asm-arm/spinlock.h b/include/asm-arm/spinlock.h
index 406ca97a8ab2..e2f1d75171df 100644
--- a/include/asm-arm/spinlock.h
+++ b/include/asm-arm/spinlock.h
@@ -199,7 +199,21 @@ static inline void __raw_read_unlock(raw_rwlock_t *rw)
         : "cc");
 }
 
-#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
+static inline int __raw_read_trylock(raw_rwlock_t *rw)
+{
+        unsigned long tmp tmp2 = 1;
+
+        __asm__ __volatile__(
+"1:     ldrex   %0, [%2]\n"
+"       adds    %0, %0, #1\n"
+"       strexpl %1, %0, [%2]\n"
+        : "=&r" (tmp), "+r" (tmp2)
+        : "r" (&rw->lock)
+        : "cc");
+
+        smp_mb();
+        return tmp2 == 0;
+}
 
 /* read_can_lock - would read_trylock() succeed? */
 #define __raw_read_can_lock(x)          ((x)->lock < 0x80000000)