Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6197fe4d720ea3e2ee94cdc7ef32d6c0151199de
Commit: 6197fe4d720ea3e2ee94cdc7ef32d6c0151199de
Parent: 679292993c77c06f7ade4e317c13256b92c2651b
Author: Kyle McMartin <[EMAIL PROTECTED]>
AuthorDate: Tue May 29 02:51:13 2007 -0700
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Tue May 29 02:51:13 2007 -0700
[SPARC]: Emulate cmpxchg like parisc
Signed-off-by: Kyle McMartin <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
arch/sparc/lib/atomic32.c | 15 +++++++++++++++
include/asm-sparc/atomic.h | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
index 559335f..617d298 100644
--- a/arch/sparc/lib/atomic32.c
+++ b/arch/sparc/lib/atomic32.c
@@ -2,6 +2,7 @@
* atomic32.c: 32-bit atomic_t implementation
*
* Copyright (C) 2004 Keith M Wesolowski
+ * Copyright (C) 2007 Kyle McMartin
*
* Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
*/
@@ -117,3 +118,17 @@ unsigned long ___change_bit(unsigned long *addr, unsigned
long mask)
return old & mask;
}
EXPORT_SYMBOL(___change_bit);
+
+unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
+{
+ unsigned long flags;
+ u32 prev;
+
+ spin_lock_irqsave(ATOMIC_HASH(addr), flags);
+ if ((prev = *ptr) == old)
+ *ptr = new;
+ spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
+
+ return (unsigned long)prev;
+}
+EXPORT_SYMBOL(__cmpxchg_u32);
diff --git a/include/asm-sparc/atomic.h b/include/asm-sparc/atomic.h
index 731fa56..bdca541 100644
--- a/include/asm-sparc/atomic.h
+++ b/include/asm-sparc/atomic.h
@@ -2,6 +2,7 @@
*
* Copyright (C) 1996 David S. Miller ([EMAIL PROTECTED])
* Copyright (C) 2000 Anton Blanchard ([EMAIL PROTECTED])
+ * Copyright (C) 2007 Kyle McMartin ([EMAIL PROTECTED])
*
* Additions by Keith M Wesolowski ([EMAIL PROTECTED]) based
* on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <[EMAIL PROTECTED]>.
@@ -10,11 +11,48 @@
#ifndef __ARCH_SPARC_ATOMIC__
#define __ARCH_SPARC_ATOMIC__
+#include <linux/types.h>
typedef struct { volatile int counter; } atomic_t;
#ifdef __KERNEL__
+/* Emulate cmpxchg() the same way we emulate atomics,
+ * by hashing the object address and indexing into an array
+ * of spinlocks to get a bit of performance...
+ *
+ * See arch/sparc/lib/atomic32.c for implementation.
+ *
+ * Cribbed from <asm-parisc/atomic.h>
+ */
+#define __HAVE_ARCH_CMPXCHG 1
+
+/* bug catcher for when unsupported size is used - won't link */
+extern void __cmpxchg_called_with_bad_pointer(void);
+/* we only need to support cmpxchg of a u32 on sparc */
+extern unsigned long __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_);
+
+/* don't worry...optimizer will get rid of most of this */
+static __inline__ unsigned long
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
+{
+ switch(size) {
+ case 4:
+ return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_);
+ default:
+ __cmpxchg_called_with_bad_pointer();
+ break;
+ }
+ return old;
+}
+
+#define cmpxchg(ptr,o,n) ({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, sizeof(*(ptr))); \
+})
+
#define ATOMIC_INIT(i) { (i) }
extern int __atomic_add_return(int, atomic_t *);
-
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