Re: [PATCH v14 4/9] acpi/arm64: Add GTDT table parse driver

From: Hanjun Guo
Date: Fri Nov 11 2016 - 08:46:58 EST


Hi Mark,

Sorry for the late reply.

On 10/21/2016 12:37 AM, Mark Rutland wrote:
Hi,

As a heads-up, on v4.9-rc1 I see conflicts at least against
arch/arm64/Kconfig. Luckily git am -3 seems to be able to fix that up
automatically, but this will need to be rebased before the next posting
and/or merging.

On Thu, Sep 29, 2016 at 02:17:12AM +0800, fu.wei@xxxxxxxxxx wrote:
+static int __init map_gt_gsi(u32 interrupt, u32 flags)
+{
+ int trigger, polarity;
+
+ if (!interrupt)
+ return 0;

Urgh.

Only the secure interrupt (which we do not need) is optional in this
manner, and (hilariously), zero appears to also be a valid GSIV, per
figure 5-24 in the ACPI 6.1 spec.

So, I think that:

(a) we should not bother parsing the secure interrupt
(b) we should drop the check above
(c) we should report the spec issue to the ASWG

Sorry, I willing to do that, but I need to figure out the issue here.
What kind of issue in detail? do you mean that zero should not be valid
for arch timer interrupts?

Thanks
Hanjun