linux-kernel - Re: [RFC PATCH v2 6/6] powerpc: Use generic code for exception handling

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Date:	Wed, 10 Apr 2013 13:32:11 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com, paulus@...ba.org,
	paulmck@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v2 6/6] powerpc: Use generic code for exception
 handling

On Wed, 2013-04-10 at 14:56 +1000, Michael Ellerman wrote:
> On Fri, Mar 29, 2013 at 06:00:21PM +0800, Li Zhong wrote:
> > After the exception handling moved to generic code, and some changes in
> ...
> > diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> > index 360fba8..eeab30f 100644
> > --- a/arch/powerpc/mm/hash_utils_64.c
> > +++ b/arch/powerpc/mm/hash_utils_64.c
> > @@ -33,6 +33,7 @@
> >  #include <linux/init.h>
> >  #include <linux/signal.h>
> >  #include <linux/memblock.h>
> > +#include <linux/context_tracking.h>
> >  
> >  #include <asm/processor.h>
> >  #include <asm/pgtable.h>
> > @@ -56,7 +57,6 @@
> >  #include <asm/fadump.h>
> >  #include <asm/firmware.h>
> >  #include <asm/tm.h>
> > -#include <asm/context_tracking.h>
> >  
> >  #ifdef DEBUG
> >  #define DBG(fmt...) udbg_printf(fmt)
> > @@ -919,13 +919,17 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
> >  	const struct cpumask *tmp;
> >  	int rc, user_region = 0, local = 0;
> >  	int psize, ssize;
> > +	enum ctx_state prev_state;
> > +
> > +	prev_state = exception_enter();
> >  
> >  	DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
> >  		ea, access, trap);
> >  
> >  	if ((ea & ~REGION_MASK) >= PGTABLE_RANGE) {
> >  		DBG_LOW(" out of pgtable range !\n");
> > - 		return 1;
> > +		rc = 1;
> > +		goto exit;
> >  	}
> >  
> >  	/* Get region & vsid */
> 
> This no longer applies on mainline, please send an updated version.

Yes, for current mainline (powerpc tree), only previous five patches
could be applied. The dependency of this patch is current in tip tree,
and seems would be in for 3.10.

There are some more details in the cover letter (#0):

"I assume these patches would get in through powerpc tree, so I didn't
combine the new patch (#6) with the original one (#2). So that if
powerpc tree picks these, it could pick the first five patches, and
apply patch #6 later when the dependency enters into powerpc tree (maybe
on some 3.10-rcs)."

Thanks, Zhong

> cheers
> 


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