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

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Date:	Thu, 18 Sep 2014 14:51:58 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jason Cooper <jason@...edaemon.net>,
	Christoph Lameter <cl@...ux.com>,
	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>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: linux-next: Tree for Sep 1


Tejun,

Could you please merge Christoph's patch to your percpu tree
(the patch is attached below for your convenience, it is a fixup
for "irqchips: Replace __this_cpu_ptr uses" patch present in
for-3.18-consistent-ops and for-next branches)?

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

On Sunday, September 14, 2014 01:40:55 AM Jason Cooper wrote:
> Christoph,
> 
> On Tue, Sep 02, 2014 at 10:00:07AM -0500, 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?
> > 
> > 
> > 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>
> 
> Acked-by: Jason Cooper <jason@...edaemon.net>
> 
> thx,
> 
> Jason.

From: Christoph Lameter <cl@...ux.com>
Subject: [PATCH] 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.

b.zolnierkie:
This fixes kernel panic on ARM Exynos4 SoCs (i.e. ODROID U3
board).

Signed-off-by: Christoph Lameter <cl@...ux.com>
Acked-by: Jason Cooper <jason@...edaemon.net>
Reported-and-tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.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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