linux-kernel - [PATCH v2 1/4] mm/pgtable: Fix continue to preallocate pmds even if failure occurrence

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Date:	Tue, 20 Aug 2013 14:54:53 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dave Hansen <dave.hansen@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Tejun Heo <tj@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH v2 1/4] mm/pgtable: Fix continue to preallocate pmds even if failure occurrence

v1 -> v2:
 * remove failed.

preallocate_pmds will continue to preallocate pmds even if failure
occurrence, and then free all the preallocate pmds if there is
failure, this patch fix it by stop preallocate if failure occurrence
and go to free path.

Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 arch/x86/mm/pgtable.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index dfa537a..65c2106 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -196,21 +196,18 @@ static void free_pmds(pmd_t *pmds[])
 static int preallocate_pmds(pmd_t *pmds[])
 {
 	int i;
-	bool failed = false;
 
 	for(i = 0; i < PREALLOCATED_PMDS; i++) {
 		pmd_t *pmd = (pmd_t *)__get_free_page(PGALLOC_GFP);
 		if (pmd == NULL)
-			failed = true;
+			goto err;
 		pmds[i] = pmd;
 	}
 
-	if (failed) {
-		free_pmds(pmds);
-		return -ENOMEM;
-	}
-
 	return 0;
+err:
+	free_pmds(pmds);
+	return -ENOMEM;
 }
 
 /*
-- 
1.8.1.2

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