linux-kernel - Re: linux-next: Tree for Sep 1

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Date:	Tue, 2 Sep 2014 10:00:07 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
cc:	Mark Brown <broonie@...nel.org>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, nicolas.pitre@...aro.org,
	Russell King <rmk+kernel@....linux.org.uk>,
	Tejun Heo <tj@...nel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: linux-next: Tree for Sep 1

On Tue, 2 Sep 2014, Christoph Lameter wrote:

> Oww.. This is double indirection deal there. A percpu offset pointing to
> a pointer?
>
> Generally the following is true (definition from
> include/asm-generic/percpu.h that is used for ARM for raw_cpu_read):
>
> #define raw_cpu_read_4(pcp)             (*raw_cpu_ptr(&(pcp)))

I think what the issue is that we dropped the fetch of the percpu offset
in the patch. Instead we are using the address of the variable that
contains the offset. Does this patch fix it?


Subject: irqchip: Properly fetch the per cpu offset

The raw_cpu_read() conversion dropped the fetch of the offset
from base->percpu_base in gic_get_percpu_base.

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/drivers/irqchip/irq-gic.c
===================================================================
--- linux.orig/drivers/irqchip/irq-gic.c
+++ linux/drivers/irqchip/irq-gic.c
@@ -102,7 +102,7 @@ static struct gic_chip_data gic_data[MAX
 #ifdef CONFIG_GIC_NON_BANKED
 static void __iomem *gic_get_percpu_base(union gic_base *base)
 {
-	return raw_cpu_read(base->percpu_base);
+	return raw_cpu_read(*base->percpu_base);
 }

 static void __iomem *gic_get_common_base(union gic_base *base)
--
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