Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

[sfrench/cifs-2.6.git] / include / asm-sparc / system.h

diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 8c259de02614be6ab1e8053f124b332a613a6456..45e47c159a6e55316e74a35cdd2303b8fb0586a0 100644 (file)
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -1,5 +1,3 @@
-/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */
-
 #ifndef __SPARC_SYSTEM_H
 #define __SPARC_SYSTEM_H
 
@@ -56,7 +54,7 @@ extern void sun_do_break(void);
 extern int serial_console;
 extern int stop_a_enabled;
 
-static __inline__ int con_is_present(void)
+static inline int con_is_present(void)
 {
        return serial_console ? 0 : 1;
 }
@@ -217,7 +215,7 @@ static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned lon
 
 extern void __xchg_called_with_bad_pointer(void);
 
-static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
+static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
 {
        switch (size) {
        case 4:
@@ -227,6 +225,54 @@ static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr,
        return x;
 }
 
+/* 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)));            \
+})
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)                                              \
+       ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+                       (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
 extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
 
 #endif /* __KERNEL__ */