linux-kernel - Re: [PATCH 06/15] MIPS: CM: Fix mips_cm_max_vp

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Date:	Wed, 3 Feb 2016 16:15:48 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Paul Burton <paul.burton@...tec.com>
CC:	<linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>,
	"Matt Redfearn" <matt.redfearn@...tec.com>,
	<linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	Markos Chandras <markos.chandras@...tec.com>
Subject: Re: [PATCH 06/15] MIPS: CM: Fix mips_cm_max_vp_width for UP kernels

On Wed, Feb 03, 2016 at 03:46:34PM +0000, Paul Burton wrote:
> On Wed, Feb 03, 2016 at 02:58:59PM +0000, James Hogan wrote:
> > On Wed, Feb 03, 2016 at 03:15:26AM +0000, Paul Burton wrote:
> > > Fix mips_cm_max_vp_width for UP kernels where it previously referenced
> > > smp_num_siblings, which is not declared for UP kernels. This led to
> > > build errors such as the following:
> > > 
> > >   drivers/built-in.o: In function `$L446':
> > >   irq-mips-gic.c:(.text+0x1994): undefined reference to `smp_num_siblings'
> > >   drivers/built-in.o:irq-mips-gic.c:(.text+0x199c): more undefined references to `smp_num_siblings' follow
> > > 
> > > On UP kernels simply return 1, leaving the reference to smp_num_siblings
> > > in place only for SMP kernels.
> > > 
> > > Signed-off-by: Paul Burton <paul.burton@...tec.com>
> > 
> > Need tagging for stable v4.3+?
> 
> It happens that there were no uses of mips_cm_max_vp_width in UP
> kernels, but some are added later in this series (the next patch for
> instance). So I don't see a need to backport to stable branches. Sorry
> that could have been clearer.
> 
> > I do wonder if this should be handled in the header files though...
> 
> As in you don't think it should be handled in headers? It seems like the
> logical place to do it to me...
> 
> Or do you mean smp_num_siblings should be defined as 1 for UP kernels? I
> did consider that approach, but thought this possibly more semantically
> correct since smp isn't in use at all so neither is smp_num_siblings.

Yeh, I meant this (didn't really register that the code in this patch
was a header too tbh).

Cheers
James

> 
> Thanks,
>     Paul
> 
> > Cheers
> > James
> > 
> > > ---
> > > 
> > >  arch/mips/include/asm/mips-cm.h | 5 ++++-
> > >  1 file changed, 4 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h
> > > index 1395bbc..3fdb6c9 100644
> > > --- a/arch/mips/include/asm/mips-cm.h
> > > +++ b/arch/mips/include/asm/mips-cm.h
> > > @@ -462,7 +462,10 @@ static inline unsigned int mips_cm_max_vp_width(void)
> > >  	if (mips_cm_revision() >= CM_REV_CM3)
> > >  		return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK;
> > >  
> > > -	return smp_num_siblings;
> > > +	if (config_enabled(CONFIG_SMP))
> > > +		return smp_num_siblings;
> > > +
> > > +	return 1;
> > >  }
> > >  
> > >  /**
> > > -- 
> > > 2.7.0
> > > 
> > > 
> 
> 

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