Fix sis_dri on ia64.
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@@ -403,6 +403,8 @@ struct sis_context
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#if defined(__i386__) || defined(__amd64__)
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#define MMIO_WMB() __asm __volatile("" : : : "memory")
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#elif defined(__ia64__)
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#define MMIO_WMB() __asm __volatile("mf" : : : "memory")
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#else
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#error platform needs WMB
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#endif
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