linux-kernel - Re: blackfin compile error

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Date:	Fri, 8 Feb 2008 00:25:06 -0500
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"Robin Getz" <rgetz@...ckfin.uclinux.org>
Cc:	"Matt Mackall" <mpm@...enic.com>, "Adrian Bunk" <bunk@...nel.org>,
	bryan.wu@...log.com,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"David Howells" <dhowells@...hat.com>
Subject: Re: blackfin compile error

On Feb 6, 2008 2:12 PM, Robin Getz <rgetz@...ckfin.uclinux.org> wrote:
> On Wed 6 Feb 2008 11:23, Matt Mackall pondered:
> > On Wed, 2008-02-06 at 17:18 +0200, Adrian Bunk wrote:
> > > Commit 698dd4ba6b12e34e1e432c944c01478c0b2cd773 broke blackfin:
> > >
> > > <--  snip  -->
> > >
> > > ...
> > >   CC      mm/vmscan.o
> > > In file included from
> > > /home/bunk/linux/kernel-2.6/git/linux-2.6/mm/vmscan.c:44:
> > > /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/swapops.h: In function 'is_swap_pte':
> > > /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/swapops.h:48: error: implicit declaration of function 'pte_none'
> > > /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/swapops.h:48: error: implicit declaration of function 'pte_present'
> > > make[2]: *** [mm/vmscan.o] Error 1
> >
> > This suggests that no one's tried to compile -mm on Blackfin since
> > before September, I think.
>
> Or any other nommu arch's either, since looking at the include files, FRV
> (when configured as noMMU) and m68knommu does not include it either...
>
> > Is there somewhere more appropriate to move it? I can't find one.
> > Failing that, we can wrap it in CONFIG_MMU, I suppose.
>
> Or just add to the the following:
>
> ./include/asm-blackfin
> ./include/asm-frv/ (only when configured as !MMU)
> ./include/asm-h8300
> ./include/asm-m68knommu
> ./include/asm-v850
>
> Others seem to have it in include/asm-xxxxx/pgtable.h as #define, inline
> function, or extern.

looks like only MMU code currently uses the function, but to keep
things nice, we may want something like:
static inline int is_swap_pte(pte_t pte)
{
#ifdef CONFIG_MMU
    return !pte_none(pte) && !pte_present(pte) && !pte_file(pte);
#else
    return 0;
#endif
}

the header is also lacking an #include <asm/pgtable.h> at the top ...
-mike
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