sh: Overhaul spinlocks and rwlocks for SH-4A SMP.

This rips out some of the old spinlock and rwlock behaviour that the SH-2
parts were using and reworks them for LL/SC semantics on the SH-4A.

This is primarily only useful for SH-X3 multi-cores, but can also be used
for building CONFIG_SMP=y testing kernels on SH-4A UP.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/include/asm-sh/spinlock_types.h b/include/asm-sh/spinlock_types.h
index 5c58134f2c4e..b4d244e7b60c 100644
--- a/include/asm-sh/spinlock_types.h
+++ b/include/asm-sh/spinlock_types.h
@@ -6,19 +6,16 @@
 #endif
 
 typedef struct {
-	volatile unsigned long lock;
+	volatile unsigned int lock;
 } raw_spinlock_t;
 
-#define __RAW_SPIN_LOCK_UNLOCKED	{ 1 }
-
-#include <asm/atomic.h>
+#define __RAW_SPIN_LOCK_UNLOCKED		{ 1 }
 
 typedef struct {
-	raw_spinlock_t lock;
-	atomic_t counter;
+	volatile unsigned int lock;
 } raw_rwlock_t;
 
 #define RW_LOCK_BIAS			0x01000000
-#define __RAW_RW_LOCK_UNLOCKED		{ { 0 }, { RW_LOCK_BIAS } }
+#define __RAW_RW_LOCK_UNLOCKED		{ RW_LOCK_BIAS }
 
 #endif