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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
@@ -541,30 +541,29 @@
#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)
{
+#if defined(__amd64__)
vm_offset_t va;
va = PHYS_TO_DMAP(start);
-
-#ifdef VM_MEMATTR_WRITE_COMBINING
return (-pmap_change_attr(va, size, VM_MEMATTR_WRITE_COMBINING));
#else
- return (-pmap_change_attr(va, size, VM_MEMATTR_UNCACHEABLE));
+ return (0);
#endif
}
static inline void
arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
{
+#if defined(__amd64__)
vm_offset_t va;
va = PHYS_TO_DMAP(start);
pmap_change_attr(va, size, VM_MEMATTR_WRITE_BACK);
-}
#endif
+}
#endif /* _LINUXKPI_LINUX_IO_H_ */

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