linux-kernel - Re: [PATCH v4 4/5] ARM: annotate VMALLOC_END definition with

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Date:	Wed, 31 Oct 2012 05:36:48 -0600
From:	Josh Cartwright <josh.cartwright@...com>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	Arnd Bergmann <arnd@...db.de>, "arm@...nel.org" <arm@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	John Linn <linnj@...inx.com>,
	Nick Bowler <nbowler@...iptictech.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v4 4/5] ARM: annotate VMALLOC_END definition with _AC

On Wed, Oct 31, 2012 at 08:43:35AM +0000, Michal Simek wrote:
> 
> 
> > -----Original Message-----
> > From: Arnd Bergmann [mailto:arnd@...db.de]
> > Sent: Tuesday, October 30, 2012 11:22 PM
> > To: Michal Simek
> > Cc: Josh Cartwright; arm@...nel.org; linux-kernel@...r.kernel.org; linux-arm-
> > kernel@...ts.infradead.org; John Linn; Nick Bowler; Russell King - ARM Linux
> > Subject: Re: [PATCH v4 4/5] ARM: annotate VMALLOC_END definition with _AC
> >
> > On Saturday 27 October 2012, Michal Simek wrote:
> > > > diff --git a/arch/arm/include/asm/pgtable.h
> > > > b/arch/arm/include/asm/pgtable.h index 08c1231..72904a2 100644
> > > > --- a/arch/arm/include/asm/pgtable.h
> > > > +++ b/arch/arm/include/asm/pgtable.h
> > > > @@ -40,7 +40,7 @@
> > > >   */
> > > >  #define VMALLOC_OFFSET               (8*1024*1024)
> > > >  #define VMALLOC_START                (((unsigned long)high_memory +
> > > > VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
> > > > -#define VMALLOC_END          0xff000000UL
> > > > +#define VMALLOC_END          _AC(0xff000000,UL)
> > >
> > > This shouldn't be the part of this series but should go to mainline through
> > different tree.
> > > Arnd, Olof: Can you take this patch to your arm-soc tree?
> > >
> > > I don't think it is a good workstyle to propose it to mainline through zynq soc
> > tree.
> > > What do you think?
> >
> > The arm-soc tree is not the right place either, this is architecture code which is in
> > Russell's domain. I would suggest getting an Ack from Russell if he's ok with it
> > and then merging it together with your other changes into arm-soc.
> 
> That's what I thought too.
> Not sure if Josh wants to push this to mainline.

The patch is not relevant anymore.  It was needed when the virtual
address of the early uart mapping was defined via VMALLOC_END.  That was
causing us problems, so we ended up choosing a fixed, known working
address within the vmalloc region to map the uart.

Thanks,

  Josh

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