linux-kernel - RE: [PATCH 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs

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Message-Id: <20150712191350.7E8D190@black.fi.intel.com>
Date:	Sun, 12 Jul 2015 22:13:50 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	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>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: RE: [PATCH 26/36] mm: rework mapcount accounting to enable 4k mapping
 of THPs

Kirill A. Shutemov wrote:
>  TESTPAGEFLAG_FALSE(TransHuge)
>  TESTPAGEFLAG_FALSE(TransCompound)
>  TESTPAGEFLAG_FALSE(TransTail)
> +TESTPAGEFLAG_FALSE(DoubleMap)
> +	TESTSETFLAG_FALSE(DoubleMap)
> +	CLEARPAGEFLAG_NOOP(DoubleMap)
>  #endif
>  
>  /*

Fixlet for !THP:


diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 757a4b162242..eec24e6391d3 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -633,7 +633,7 @@ TESTPAGEFLAG_FALSE(TransCompound)
 TESTPAGEFLAG_FALSE(TransTail)
 TESTPAGEFLAG_FALSE(DoubleMap)
 	TESTSETFLAG_FALSE(DoubleMap)
-	CLEARPAGEFLAG_NOOP(DoubleMap)
+	TESTCLEARFLAG_FALSE(DoubleMap)
 #endif
 
 /*
--
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