add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/of/base.c
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@@ -628,6 +628,28 @@
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 EXPORT_SYMBOL(of_device_is_available);
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 /**
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+ *  __of_device_is_fail - check if a device has status "fail" or "fail-..."
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+ *
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+ *  @device: Node to check status for, with locks already held
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+ *
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+ *  Return: True if the status property is set to "fail" or "fail-..." (for any
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+ *  error code suffix), false otherwise
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+ */
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+static bool __of_device_is_fail(const struct device_node *device)
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+{
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+	const char *status;
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+
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+	if (!device)
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+		return false;
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+
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+	status = __of_get_property(device, "status", NULL);
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+	if (status == NULL)
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+		return false;
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+
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+	return !strcmp(status, "fail") || !strncmp(status, "fail-", 5);
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+}
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+
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+/**
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  *  of_device_is_big_endian - check if a device has BE registers
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  *
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  *  @device: Node to check for endianness
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@@ -775,6 +797,9 @@
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  *	of_get_next_cpu_node - Iterate on cpu nodes
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  *	@prev:	previous child of the /cpus node, or NULL to get first
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  *
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+ *	Unusable CPUs (those with the status property set to "fail" or "fail-...")
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+ * 	will be skipped.
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+ *
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  *	Returns a cpu node pointer with refcount incremented, use of_node_put()
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  *	on it when done. Returns NULL when prev is the last child. Decrements
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  *	the refcount of prev.
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@@ -796,6 +821,8 @@
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 		of_node_put(node);
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 	}
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 	for (; next; next = next->sibling) {
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+		if (__of_device_is_fail(next))
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+			continue;
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 		if (!(of_node_name_eq(next, "cpu") ||
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 		      __of_node_is_type(next, "cpu")))
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 			continue;