linux-kernel - Re: [patch] build error: allnoconfig fails on mincore/swapper

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Date:	Thu, 15 Feb 2007 08:55:00 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, tony.luck@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] build error: allnoconfig fails on mincore/swapper_space

On Wed, 14 Feb 2007 00:19:06 +0000 (GMT) Hugh Dickins wrote:

> On Tue, 13 Feb 2007, Randy Dunlap wrote:
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> > 
> > Don't check for pte swap entries when CONFIG_SWAP=n.
> > And save 'present' in the vec array.
> > 
> > mm/built-in.o: In function `sys_mincore':
> > (.text+0xe584): undefined reference to `swapper_space'
> > 
> > Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> 
> What you've done there is fine, Randy, thank you.
> 
> But I just got out of bed to take another look, and indeed:
> what is it doing in the none_mapped !vma->vm_file case?
> passing back an uninitialized vector.
> 
> Easy enough to fix, but I'd say Nick's patch has by now exceeded
> its embarrassment quota, and should be reverted from Linus' tree
> for now: clearly none of us have been paying enough attention,
> and other eyes are liable to find further errors lurking in it.
> 
> Hugh


so, are we going to get a revert of 42da9cbd3eedde33a42acc2cb06f454814cf5de0 ?
Has that been requested?  or are there other plans?

Thanks.

> > ---
> >  mm/mincore.c |    5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > --- linux-2.6.20-git9.orig/mm/mincore.c
> > +++ linux-2.6.20-git9/mm/mincore.c
> > @@ -111,6 +111,7 @@ static long do_mincore(unsigned long add
> >  			present = mincore_page(vma->vm_file->f_mapping, pgoff);
> >  
> >  		} else { /* pte is a swap entry */
> > +#ifdef CONFIG_SWAP
> >  			swp_entry_t entry = pte_to_swp_entry(pte);
> >  			if (is_migration_entry(entry)) {
> >  				/* migration entries are always uptodate */
> > @@ -119,7 +120,11 @@ static long do_mincore(unsigned long add
> >  				pgoff = entry.val;
> >  				present = mincore_page(&swapper_space, pgoff);
> >  			}
> > +#else
> > +			present = 1;
> > +#endif
> >  		}
> > +		vec[i] = present;
> >  	}
> >  	pte_unmap_unlock(ptep-1, ptl);
> 
> --

---
~Randy
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