D36022.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/io.h b/sys/compat/linuxkpi/common/include/linux/io.h
	--- a/sys/compat/linuxkpi/common/include/linux/io.h
	+++ b/sys/compat/linuxkpi/common/include/linux/io.h
	@@ -38,6 +38,7 @@

	#include <linux/compiler.h>
	#include <linux/types.h>
	+#include <asm/set_memory.h>

	/*
	* XXX This is all x86 specific. It should be bus space access.
	@@ -494,4 +495,19 @@
	#define arch_phys_wc_index(x) \
	(((x) < __MTRR_ID_BASE) ? -1 : ((x) - __MTRR_ID_BASE))

	+#if defined(__amd64__) \|\| defined(__i386__) \|\| defined(__aarch64__) \|\| defined(__powerpc__) \|\| defined(__riscv)
	+static inline int
	+arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size)
	+{
	+
	+ return (set_memory_wc(start, size >> PAGE_SHIFT));
	+}
	+
	+static inline void
	+arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
	+{
	+ set_memory_wb(start, size >> PAGE_SHIFT);
	+}
	+#endif
	+
	#endif /* _LINUXKPI_LINUX_IO_H_ */