linux-kernel - Re: [ 07/44] ARM: 7477/1: vfp: Always save VFP state in vfp_pm

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Message-ID: <20120815140541.GB22871@kroah.com>
Date:	Wed, 15 Aug 2012 07:05:41 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Colin Cross <ccross@...roid.com>,
	Barry Song <bs14@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Ido Yariv <ido@...ery.com>, Daniel Drake <dsd@...top.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [ 07/44] ARM: 7477/1: vfp: Always save VFP state in
 vfp_pm_suspend on UP

On Tue, Aug 14, 2012 at 05:01:11PM -0300, Herton Ronaldo Krzesinski wrote:
> On Mon, Aug 13, 2012 at 03:02:14PM -0700, Greg Kroah-Hartman wrote:
> > From: Greg KH <gregkh@...uxfoundation.org>
> > 
> [...]
> > --- a/arch/arm/vfp/vfpmodule.c
> > +++ b/arch/arm/vfp/vfpmodule.c
> > @@ -412,6 +412,12 @@ static int vfp_pm_suspend(void)
> >  
> >  		/* disable, just in case */
> >  		fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
> > +	} else if (vfp_current_hw_state[ti->cpu]) {
> > +#ifndef CONFIG_SMP
> > +		fmxr(FPEXC, fpexc | FPEXC_EN);
> > +		vfp_save_state(vfp_current_hw_state[ti->cpu], fpexc);
> > +		fmxr(FPEXC, fpexc);
> > +#endif
> 
> This fails to build on 3.0:
> 
> linux-stable/arch/arm/vfp/vfpmodule.c: In function 'vfp_pm_suspend':
> linux-stable/arch/arm/vfp/vfpmodule.c:415:13: error: 'vfp_current_hw_state' undeclared (first use in this function)
> linux-stable/arch/arm/vfp/vfpmodule.c:415:13: note: each undeclared identifier is reported only once for each function it appears in
> make[3]: *** [arch/arm/vfp/vfpmodule.o] Error 1
> 
> In 3.0, vfp_current_hw_state was still named last_VFP_context, so I
> think just renaming should be enough to fix this.

I'll remove the patch as it probably just shouldn't be there, right?  If
you think it should be in 3.0-stable, can you please send me a fixed up
patch that you have tested that it at least builds properly?

thanks,

greg k-h
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