linux-kernel - Re: [PATCH] x86, acpi: Handle lapic/x2apic entries in MADT

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Date:	Wed, 26 Aug 2015 12:42:50 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	"Anaczkowski, Lukasz" <lukasz.anaczkowski@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"Brown, Len" <len.brown@...el.com>, "pavel@....cz" <pavel@....cz>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH] x86, acpi: Handle lapic/x2apic entries in MADT

Hi Lukasz,

On Wed, Aug 26, 2015 at 11:43:04AM +0100, Marc Zyngier wrote:
> Hi Lukasz,
> 
> On 26/08/15 08:04, Anaczkowski, Lukasz wrote:
> > On Monday, August 3, 2015 8:26 PM
> > Lukasz Anaczkowski <lukasz.anaczkowski@...el.com> wrote:
> > 
> >> v2: Fixed ARM64 syntax error
> > 
> > Hi Marc,
> > 
> > Does this patch look ok now?

No it does not, it seems to break arm64, I put together a fix
below. I do not think the way you handle the count increment
in acpi_parse_entries() is correct anyway, since you increment
it only if max_entries != 0, which changes mainline behaviour.

Thanks,
Lorenzo

-- >8 --

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index d98b866..ca5591d 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1101,7 +1101,7 @@ gic_v2_acpi_init(struct acpi_table_header *table)
 	count = acpi_parse_entries(ACPI_SIG_MADT,
 				   sizeof(struct acpi_table_madt),
 				   table, &gic_proc, 1, 0);
-	if (count <= 0) {
+	if (gic_proc.count <= 0) {
 		pr_err("No valid GICC entries exist\n");
 		return -EINVAL;
 	}
@@ -1117,7 +1117,7 @@ gic_v2_acpi_init(struct acpi_table_header *table)
 	count = acpi_parse_entries(ACPI_SIG_MADT,
 				   sizeof(struct acpi_table_madt),
 				   table, &gic_proc, 1, 0);
-	if (count <= 0) {
+	if (gic_proc.count <= 0) {
 		pr_err("No valid GICD entries exist\n");
 		return -EINVAL;
 	} else if (count > 1) {
-- 
2.2.1

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