D56971.id177806.diff
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D56971.id177806.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
	@@ -544,6 +544,9 @@
	#if defined(__amd64__)
	void *va;

	+ if (!PHYS_IN_DMAP(start) \|\| !PHYS_IN_DMAP(start + size))
	+ return (-EINVAL);
	+
	va = PHYS_TO_DMAP(start);
	return (-pmap_change_attr(va, size, VM_MEMATTR_WRITE_COMBINING));
	#else
	@@ -557,8 +560,10 @@
	#if defined(__amd64__)
	void *va;

	- va = PHYS_TO_DMAP(start);
	+ if (!PHYS_IN_DMAP(start) \|\| !PHYS_IN_DMAP(start + size))
	+ return;

	+ va = PHYS_TO_DMAP(start);
	pmap_change_attr(va, size, VM_MEMATTR_WRITE_BACK);
	#endif
	}