linux-kernel - [PATCH 3/5] use new pagetable helpers in try_preserve_large

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Message-Id: <20130121175247.76641034@kernel.stglabs.ibm.com>
Date:	Mon, 21 Jan 2013 09:52:47 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, Gleb Natapov <gleb@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: [PATCH 3/5] use new pagetable helpers in try_preserve_large_page()


try_preserve_large_page() can be slightly simplified by using
the new page_level_*() helpers.

Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com>
---

 linux-2.6.git-dave/arch/x86/mm/pageattr.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff -puN arch/x86/mm/pageattr.c~use-new-pagetable-helpers arch/x86/mm/pageattr.c
--- linux-2.6.git/arch/x86/mm/pageattr.c~use-new-pagetable-helpers	2013-01-17 10:22:26.282431407 -0800
+++ linux-2.6.git-dave/arch/x86/mm/pageattr.c	2013-01-17 10:22:26.286431442 -0800
@@ -412,15 +412,12 @@ try_preserve_large_page(pte_t *kpte, uns
 
 	switch (level) {
 	case PG_LEVEL_2M:
-		psize = PMD_PAGE_SIZE;
-		pmask = PMD_PAGE_MASK;
-		break;
 #ifdef CONFIG_X86_64
 	case PG_LEVEL_1G:
-		psize = PUD_PAGE_SIZE;
-		pmask = PUD_PAGE_MASK;
-		break;
 #endif
+		psize = page_level_size(level);
+		pmask = page_level_mask(level);
+		break;
 	default:
 		do_split = -EINVAL;
 		goto out_unlock;
_

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