D45914.diff
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	diff --git a/tests/sys/kern/subr_physmem_test.c b/tests/sys/kern/subr_physmem_test.c
	--- a/tests/sys/kern/subr_physmem_test.c
	+++ b/tests/sys/kern/subr_physmem_test.c
	@@ -160,11 +160,54 @@
	ATF_CHECK_EQ(avail[1], 3 * PAGE_SIZE);
	}

	+ATF_TC_WITHOUT_HEAD(hwregion_ignore_empty);
	+ATF_TC_BODY(hwregion_ignore_empty, tc)
	+{
	+ vm_paddr_t avail[4];
	+ size_t len;
	+
	+ /* Add a region. */
	+ physmem_hardware_region(PAGE_SIZE, 2 * PAGE_SIZE);
	+
	+ /* Add full zero range (ignored) */
	+ physmem_hardware_region(0, 0);
	+
	+ /* Add a zero-sized range (ignored) */
	+ physmem_hardware_region(4 * PAGE_SIZE, 0);
	+
	+ len = physmem_avail(avail, nitems(avail));
	+ ATF_CHECK_EQ(len, 2);
	+ ATF_CHECK_EQ(avail[0], PAGE_SIZE);
	+ ATF_CHECK_EQ(avail[1], 3 * PAGE_SIZE);
	+}
	+
	+ATF_TC_WITHOUT_HEAD(hwregion_ignore_page0);
	+ATF_TC_BODY(hwregion_ignore_page0, tc)
	+{
	+ vm_paddr_t avail[4];
	+ size_t len;
	+
	+ /*
	+ * Physical addresses [0, PAGE_SIZE) are unusable in the VM layer.
	+ *
	+ * physmem will truncate this from the beginning of an otherwise valid
	+ * memory range; test that this is the case.
	+ */
	+ physmem_hardware_region(0, 2 * PAGE_SIZE);
	+
	+ len = physmem_avail(avail, 4);
	+ ATF_CHECK_EQ(len, 2);
	+ ATF_CHECK_EQ(avail[0], PAGE_SIZE);
	+ ATF_CHECK_EQ(avail[1], 2 * PAGE_SIZE);
	+}
	+
	ATF_TP_ADD_TCS(tp)
	{

	ATF_TP_ADD_TC(tp, hwregion);
	ATF_TP_ADD_TC(tp, hwregion_exclude);
	ATF_TP_ADD_TC(tp, hwregion_unordered);
	+ ATF_TP_ADD_TC(tp, hwregion_ignore_empty);
	+ ATF_TP_ADD_TC(tp, hwregion_ignore_page0);
	return (atf_no_error());
	}