On Mon, Sep 15, 2014 at 07:38:08AM +0100, Olof Johansson wrote:

On Fri, Sep 12, 2014 at 10:00:07PM +0800, Hanjun Guo wrote:

quoted

+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+	struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
+
+	/*
+	 * Revision in table header is the FADT Major revision,
+	 * and there is a minor revision of FADT which was introduced
+	 * by ACPI 5.1, we only deal with ACPI 5.1 or higher revision
+	 * to get arm boot flags, or we will disable ACPI.
+	 */
+	if (table->revision > 5 ||
+	    (table->revision == 5 && fadt->minor_revision >= 1))
+		return 0;

The commend and code disagree. The code says 5.1 or newer, while the comment say
_only_ 5.1. One or the other needs to change.

I don't think the comment and code disagree, it says "we only deal with
ACPI 5.1 _or_ higher revision".

But since you mention it and following my other thread with Grant, I
think at least for now we should make this check 5.1 only.

-- 
Catalin