linux-kernel - Re: CONFIG_SWAP=n broken in latest tree

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Message-Id: <20070214144915.42fa803d.randy.dunlap@oracle.com>
Date:	Wed, 14 Feb 2007 14:49:15 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	"Hugh Dickins <hugh@...itas.com> Andrew Morton" 
	<akpm@...ux-foundation.org>,
	"Torvalds@...ux-foundation.org Torvalds" 
	<torvalds@...ux-foundation.org>
Subject: Re: CONFIG_SWAP=n broken in latest tree

On Wed, 14 Feb 2007 14:41:05 -0800 Roland Dreier wrote:

> Commit 42da9cbd ("mm: mincore anon") breaks CONFIG_SWAP=n builds with:
> 
>     mm/built-in.o: In function `sys_mincore':
>     (.text+0xe2c4): undefined reference to `swapper_space'
> 
> because swapper_space is used unconditionally in mm/mincore.c but only
> defined in swap_state.c, which isn't built if CONFIG_SWAP=n.
> 
> I'd include a patch but I'm not sure what the right fix is really --
> the naively obvious thing to do would be to add an #ifdef to mincore.c
> like the below, but I don't know this area at all well enough to be
> confident in the fix.
> 
> diff --git a/mm/mincore.c b/mm/mincore.c
> index 95c5f49..266506f 100644
> --- a/mm/mincore.c
> +++ b/mm/mincore.c
> @@ -109,8 +109,9 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
>  		} else if (pte_file(pte)) {
>  			pgoff = pte_to_pgoff(pte);
>  			present = mincore_page(vma->vm_file->f_mapping, pgoff);
> -
> -		} else { /* pte is a swap entry */
> +		}
> +#ifdef CONFIG_SWAP
> +		else { /* pte is a swap entry */
>  			swp_entry_t entry = pte_to_swp_entry(pte);
>  			if (is_migration_entry(entry)) {
>  				/* migration entries are always uptodate */
> @@ -120,6 +121,7 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
>  				present = mincore_page(&swapper_space, pgoff);
>  			}
>  		}
> +#endif /* CONFIG_SWAP */
>  	}
>  	pte_unmap_unlock(ptep-1, ptl);
>  
> -

We've beat this almost to death... just need some patch merged.

or reverted.

---
~Randy
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