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

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Date:	Wed, 03 Sep 2014 18:09:56 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Christoph Lameter <cl@...ux.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


Hi,

On Tuesday, September 02, 2014 10:00:07 AM Christoph Lameter wrote:
> 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?

Yes, it fixes the problem.  Thank you.

Tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> 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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