linux-kernel - Re: blackfin compile error

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Message-Id: <200802061412.50675.rgetz@blackfin.uclinux.org>
Date:	Wed, 6 Feb 2008 14:12:50 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Matt Mackall" <mpm@...enic.com>
Cc:	"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 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.

> Signed-off-by: Matt Mackall <mpm@...enic.com>
> 
> diff -r 50a6e531a9f2 include/linux/swapops.h
> --- a/include/linux/swapops.h	Mon Feb 04 20:23:02 2008 -0600
> +++ b/include/linux/swapops.h	Wed Feb 06 10:21:32 2008 -0600
> @@ -42,11 +42,13 @@
>  	return entry.val & SWP_OFFSET_MASK(entry);
>  }
>  
> +#ifdef CONFIG_MMU
>  /* check whether a pte points to a swap entry */
>  static inline int is_swap_pte(pte_t pte)
>  {
>  	return !pte_none(pte) && !pte_present(pte) && !pte_file(pte);
>  }
> +#endif
>  
>  /*
>   * Convert the arch-dependent pte representation of a swp_entry_t into
> an
> 
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