linux-kernel - Re: [PATCH] mm/migrate.c: take returned value ofisolate_huge_page()(Re: [PATCH 4/9] migrate: add hugepage migration code tomove

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Date:	Fri, 15 Nov 2013 10:03:56 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Hillf Danton <dhillf@...il.com>, Michal Hocko <mhocko@...e.cz>,
	Rik van Riel <riel@...hat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH] mm/migrate.c: take returned value
 ofisolate_huge_page()(Re: [PATCH 4/9] migrate: add hugepage migration code
 tomove_pages())

On Thu, Nov 14, 2013 at 03:11:21PM -0800, David Rientjes wrote:
> On Thu, 14 Nov 2013, Naoya Horiguchi wrote:
> 
> > Introduces a cosmetic substitution of the returned value of isolate_huge_page()
> > to suppress a build warning when !CONFIG_HUGETLBFS. No behavioral change.
> > 
> > Reported-by: Borislav Petkov <bp@...en8.de>
> > Tested-by: Borislav Petkov <bp@...en8.de>
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> > ---
> >  mm/migrate.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/mm/migrate.c b/mm/migrate.c
> > index 4cd63c2..4a26042 100644
> > --- a/mm/migrate.c
> > +++ b/mm/migrate.c
> > @@ -1168,7 +1168,7 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
> >  			goto put_and_set;
> >  
> >  		if (PageHuge(page)) {
> > -			isolate_huge_page(page, &pagelist);
> > +			err = isolate_huge_page(page, &pagelist);
> >  			goto put_and_set;
> >  		}
> >  
> 
> I think it would be better to just fix hugetlb.h to do
> 
> 	static inline bool isolate_huge_page(struct page *page, struct list_head *list)
> 	{
> 		return false;
> 	}
> 
> for the !CONFIG_HUGETLB_PAGE variant.

Right. I confirmed that it fixes the warning with Borislav's .config.
Here is new one. Could you add some credit tag?

Thanks,
Naoya
---
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Date: Fri, 15 Nov 2013 09:00:15 -0500
Subject: [PATCH] mm/migrate.c: take returned value of isolate_huge_page()

Introduces a cosmetic substitution of the returned value of isolate_huge_page()
to suppress a build warning when !CONFIG_HUGETLBFS. No behavioral change.

Reported-by: Borislav Petkov <bp@...en8.de>
Tested-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 include/linux/hugetlb.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index acd2010328f3..25cdb9b285a9 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -137,7 +137,10 @@ static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 	return 0;
 }
 
-#define isolate_huge_page(p, l) false
+static inline bool isolate_huge_page(struct page *page, struct list_head *list)
+{
+	return false;
+}
 #define putback_active_hugepage(p)	do {} while (0)
 #define is_hugepage_active(x)	false
 static inline void copy_huge_page(struct page *dst, struct page *src)
-- 
1.8.3.1

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