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authorPaul Mundt <lethal@linux-sh.org>2008-07-29 08:09:44 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-07-29 08:09:44 +0900
commitf15cbe6f1a4b4d9df59142fc8e4abb973302cf44 (patch)
tree774d7b11abaaf33561ab8268bf51ddd9ceb79025 /arch/sh/include/asm/cmpxchg-irq.h
parent25326277d8d1393d1c66240e6255aca780f9e3eb (diff)
sh: migrate to arch/sh/include/
This follows the sparc changes a439fe51a1f8eb087c22dd24d69cebae4a3addac. Most of the moving about was done with Sam's directions at: http://marc.info/?l=linux-sh&m=121724823706062&w=2 with subsequent hacking and fixups entirely my fault. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/include/asm/cmpxchg-irq.h')
-rw-r--r--arch/sh/include/asm/cmpxchg-irq.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/sh/include/asm/cmpxchg-irq.h b/arch/sh/include/asm/cmpxchg-irq.h
new file mode 100644
index 000000000000..43049ec0554b
--- /dev/null
+++ b/arch/sh/include/asm/cmpxchg-irq.h
@@ -0,0 +1,40 @@
+#ifndef __ASM_SH_CMPXCHG_IRQ_H
+#define __ASM_SH_CMPXCHG_IRQ_H
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+ unsigned long flags, retval;
+
+ local_irq_save(flags);
+ retval = *m;
+ *m = val;
+ local_irq_restore(flags);
+ return retval;
+}
+
+static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
+{
+ unsigned long flags, retval;
+
+ local_irq_save(flags);
+ retval = *m;
+ *m = val & 0xff;
+ local_irq_restore(flags);
+ return retval;
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+ unsigned long new)
+{
+ __u32 retval;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ retval = *m;
+ if (retval == old)
+ *m = new;
+ local_irq_restore(flags); /* implies memory barrier */
+ return retval;
+}
+
+#endif /* __ASM_SH_CMPXCHG_IRQ_H */