linux-kernel - [PATCH v3 09/14] mm, hugetlb: remove a check for return value of alloc_huge

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Message-Id: <1387349640-8071-10-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Wed, 18 Dec 2013 15:53:55 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v3 09/14] mm, hugetlb: remove a check for return value of alloc_huge_page()

Now, alloc_huge_page() only return -ENOSPEC if failed.
So, we don't need to worry about other return value.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d960f46..0f56bbf 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2621,7 +2621,6 @@ retry_avoidcopy:
 	new_page = alloc_huge_page(vma, address, use_reserve);
 
 	if (IS_ERR(new_page)) {
-		long err = PTR_ERR(new_page);
 		page_cache_release(old_page);
 
 		/*
@@ -2650,10 +2649,7 @@ retry_avoidcopy:
 
 		/* Caller expects lock to be held */
 		spin_lock(ptl);
-		if (err == -ENOMEM)
-			return VM_FAULT_OOM;
-		else
-			return VM_FAULT_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	}
 
 	/*
@@ -2785,11 +2781,7 @@ retry:
 
 		page = alloc_huge_page(vma, address, use_reserve);
 		if (IS_ERR(page)) {
-			ret = PTR_ERR(page);
-			if (ret == -ENOMEM)
-				ret = VM_FAULT_OOM;
-			else
-				ret = VM_FAULT_SIGBUS;
+			ret = VM_FAULT_SIGBUS;
 			goto out;
 		}
 		clear_huge_page(page, address, pages_per_huge_page(h));
-- 
1.7.9.5

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