linux-kernel - Re: linux-next: Tree for Nov 27 (mm stuff)

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Date:	Fri, 27 Nov 2015 16:40:06 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linux MM <linux-mm@...ck.org>
Subject: Re: linux-next: Tree for Nov 27 (mm stuff)

On Fri, Nov 27, 2015 at 01:16:40PM +0300, Vladimir Davydov wrote:
> On Fri, Nov 27, 2015 at 06:17:39PM +0900, Sergey Senozhatsky wrote:
> > Cc Vladimir, Kirill, Andrew
> > 
> > On (11/27/15 18:10), Sergey Senozhatsky wrote:
> > > On (11/26/15 23:04), Randy Dunlap wrote:
> > > > 
> > > > on i386:
> > > > 
> > > > mm/built-in.o: In function `page_referenced_one':
> > > > rmap.c:(.text+0x362a2): undefined reference to `pmdp_clear_flush_young'
> > > > mm/built-in.o: In function `page_idle_clear_pte_refs_one':
> > > > page_idle.c:(.text+0x4b2b8): undefined reference to `pmdp_test_and_clear_young'
> > > > 
> > > 
> > > Hello,
> > > 
> > > https://lkml.org/lkml/2015/11/24/160
> > > 
> > > corresponding patch mm-add-page_check_address_transhuge-helper-fix.patch added
> > > to -mm tree.
> > > 
> > 
> > my bad, it's in -next already.
> 
> Sigh, this fails for me too :-( Kirill was right that this hack might
> not always work.
> 
> So, we still need to check explicitly if CONFIG_TRANSPARENT_HUGEPAGE is
> enabled whenever we use page_check_address_transhuge, as Kirill proposed
> initially. The patch below does the trick. The previous "fix" is still
> useful though, because it reduces the size of kernels compiled w/o
> tranparent huge page feature.
> 
> Andrew, could you please merge this patch too?
> 
> Sorry for all the trouble.
> 
> Thanks,
> Vladimir
> ---
> diff --git a/mm/page_idle.c b/mm/page_idle.c
> index 374931f..aa7ca61 100644
> --- a/mm/page_idle.c
> +++ b/mm/page_idle.c
> @@ -66,7 +66,7 @@ static int page_idle_clear_pte_refs_one(struct page *page,
>  	if (pte) {
>  		referenced = ptep_clear_young_notify(vma, addr, pte);
>  		pte_unmap(pte);
> -	} else
> +	} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
>  		referenced = pmdp_clear_young_notify(vma, addr, pmd);

I would like to have yet another 'else' with warning just in case, as I
proposed initially:

https://lkml.kernel.org/g/20151124090930.GB15712@node.shutemov.name

-- 
 Kirill A. Shutemov
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