linux-kernel - Re: [BUILD-FAILURE] 2.6.26-rc8-mm1 - x86 - __ptep_modify_prot

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Date:	Thu, 3 Jul 2008 21:03:07 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	apw@...dowen.org, Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [BUILD-FAILURE] 2.6.26-rc8-mm1 - x86 -
	__ptep_modify_prot_start() missing

On Thu, Jul 03, 2008 at 11:14:18AM -0700, Andrew Morton wrote:
> On Thu, 03 Jul 2008 11:00:35 -0700 Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > >> make[1]: *** [arch/x86/kernel/paravirt.o] Error 1
> > >> make: *** [arch/x86/kernel] Error 2
> > >>
> > >> linux-next patches has the changes to the adds the function
> > >> __ptep_modify_prot_start as inline, the patch s390-build-fixes.patch
> > >> is coverting it into macro. Reverting the s390-build-fixes.patch
> > >> fixes the build failure.
> > >>     
> > >
> > > grump.  Who did all this stuff?
> > >
> > > I dunno.  I'll drop s390-build-fixes.patch, add some ccs and stomp off.
> > >
> > >
> > > From: Andrew Morton <akpm@...ux-foundation.org>
> > >
> > > In file included from include/asm/pgtable.h:1087,
> > >                  from include/linux/mm.h:39,
> > >                  from arch/s390/mm/hugetlbpage.c:8:
> > > include/asm-generic/pgtable.h: In function '__ptep_modify_prot_start':
> > > include/asm-generic/pgtable.h:209: error: dereferencing pointer to incomplete type
> > >   
> > 
> > We can't turn them into macros because we're expecting to be able to 
> > take the address of __ptep_modify_prot_start/commit.  What type is not 
> > defined on s390 at that point?  Would simply adding an extra include to 
> > arch/s390/mm/hugetlbpage.c fix the problem?

We need struct task_struct... I added an include <linux/sched.h> to
asm-s390/pgtable.h and it seems to fix the build problem.
I expected include dependency hell...

> > In the worst case we could push __ptep_modify_proc_start/commit out of 
> > line somewhere appropriate, but that's a bit sad given how simple they are.
> 
> I think the s390 guys just fixed the original build error.

Not this one, but if it works I'm going to push that to git-s390.
Currently wading through the s390 build bugs in linux-next and trying to
fix them all :/
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