linux-kernel - Re: [PATCHv9 25/36] mm, thp: remove infrastructure for handling splitting PMDs

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Message-ID: <20150803104110.GA25034@node.dhcp.inet.fi>
Date:	Mon, 3 Aug 2015 13:41:10 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv9 25/36] mm, thp: remove infrastructure for handling
 splitting PMDs

On Fri, Jul 31, 2015 at 05:01:06PM +0200, Jerome Marchand wrote:
> On 07/20/2015 04:20 PM, Kirill A. Shutemov wrote:
> > @@ -1616,23 +1605,14 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
> >   * Note that if it returns 1, this routine returns without unlocking page
> >   * table locks. So callers must unlock them.
> >   */
> 
> The comment above should be updated.

Like this?

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d32277463932..78a6c7cdf8f7 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1627,11 +1627,10 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 }
 
 /*
- * Returns 1 if a given pmd maps a stable (not under splitting) thp.
- * Returns -1 if it maps a thp under splitting. Returns 0 otherwise.
+ * Returns true if a given pmd maps a thp, false otherwise.
  *
- * Note that if it returns 1, this routine returns without unlocking page
- * table locks. So callers must unlock them.
+ * Note that if it returns true, this routine returns without unlocking page
+ * table lock. So callers must unlock it.
  */
 bool __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
 		spinlock_t **ptl)
-- 
 Kirill A. Shutemov
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