linux-kernel - Re: [PATCH 4.0 00/58] 4.0.9-stable review

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Message-ID: <1437512551.5718.19.camel@falcon.homelinux.org>
Date:	Tue, 21 Jul 2015 17:02:31 -0400
From:	Donald Parsons <dparsons@...ghtdsl.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 4.0 00/58] 4.0.9-stable review

On Tue, 2015-07-21 at 11:13 -0700, Greg Kroah-Hartman wrote:
> On Tue, Jul 21, 2015 at 01:13:27PM -0400, Donald Parsons wrote:
> > Greg,
> > 
> > The kernel still does not compile with gcc-4.5.1 since linux-4.0.5 when
> > a kvm back-port from 4.1-rc5 went in.  (This is on Linux 4.1.2 SMP Mon
> > Jul 13 18:08:30 EDT 2015 x86_64      Fedora 14)
> > 
> > This mis-compile was fixed in 4.1-rc8.  The diff was:
> > 
> > diff -ur linux-4.1-rc7/arch/x86/kvm/mmu.c
> > linux-4.1-rc8/arch/x86/kvm/mmu.c
> > --- linux-4.1-rc7/arch/x86/kvm/mmu.c	2015-07-15 00:05:34.000000000 -0400
> > +++ linux-4.1-rc8/arch/x86/kvm/mmu.c	2015-07-15 00:07:45.000000000 -0400
> > @@ -4215,13 +4215,13 @@
> >  	u64 entry, gentry, *spte;
> >  	int npte;
> >  	bool remote_flush, local_flush, zap_page;
> > -	union kvm_mmu_page_role mask = (union kvm_mmu_page_role) {
> > -		.cr0_wp = 1,
> > -		.cr4_pae = 1,
> > -		.nxe = 1,
> > -		.smep_andnot_wp = 1,
> > -		.smap_andnot_wp = 1,
> > -	};
> > +	union kvm_mmu_page_role mask = { };
> > +
> > +	mask.cr0_wp = 1;
> > +	mask.cr4_pae = 1;
> > +	mask.nxe = 1;
> > +	mask.smep_andnot_wp = 1;
> > +	mask.smap_andnot_wp = 1;
> >  
> >  	/*
> >  	 * If we don't have indirect shadow pages, it means no page is
> > 
> > 
> > Please add to linux-4.0.9 so older compilers will work.
> 
> What is the commit id in Linus's tree that resolves this?

I do not know but I found this in Linus' linux-4.1-rc8 email announce:

Andrew Morton (1):
      arch/x86/kvm/mmu.c: work around gcc-4.4.4 bug

which must be it.  Added Andrew to cc as he hopefully knows the answer
to your question.

Thanks,
Don Parsons





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