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Diffstat (limited to 'arch/arm/include/asm/xen/events.h')
-rw-r--r--arch/arm/include/asm/xen/events.h25
1 files changed, 4 insertions, 21 deletions
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index 5c27696de14f..8b1f37bfeeec 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -2,6 +2,7 @@
#define _ASM_ARM_XEN_EVENTS_H
#include <asm/ptrace.h>
+#include <asm/atomic.h>
enum ipi_vector {
XEN_PLACEHOLDER_VECTOR,
@@ -15,26 +16,8 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->ARM_cpsr);
}
-/*
- * We cannot use xchg because it does not support 8-byte
- * values. However it is safe to use {ldr,dtd}exd directly because all
- * platforms which Xen can run on support those instructions.
- */
-static inline xen_ulong_t xchg_xen_ulong(xen_ulong_t *ptr, xen_ulong_t val)
-{
- xen_ulong_t oldval;
- unsigned int tmp;
-
- wmb();
- asm volatile("@ xchg_xen_ulong\n"
- "1: ldrexd %0, %H0, [%3]\n"
- " strexd %1, %2, %H2, [%3]\n"
- " teq %1, #0\n"
- " bne 1b"
- : "=&r" (oldval), "=&r" (tmp)
- : "r" (val), "r" (ptr)
- : "memory", "cc");
- return oldval;
-}
+#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((ptr), \
+ atomic64_t, \
+ counter), (val))
#endif /* _ASM_ARM_XEN_EVENTS_H */