linux-kernel - [cleanup][PATCH 1/2] mlock_vma_pages_range() never return negative value

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Message-Id: <20091228114519.A678.A69D9226@jp.fujitsu.com>
Date:	Mon, 28 Dec 2009 11:45:58 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [cleanup][PATCH 1/2] mlock_vma_pages_range() never return negative value

Currently, mlock_vma_pages_range() never return negative value. Then, we can
remove some worthless error check.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/mmap.c |   11 ++---------
 1 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 64e0b04..826b0ec 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1247,12 +1247,7 @@ out:
 	mm->total_vm += len >> PAGE_SHIFT;
 	vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
 	if (vm_flags & VM_LOCKED) {
-		/*
-		 * makes pages present; downgrades, drops, reacquires mmap_sem
-		 */
 		long nr_pages = mlock_vma_pages_range(vma, addr, addr + len);
-		if (nr_pages < 0)
-			return nr_pages;	/* vma gone! */
 		mm->locked_vm += (len >> PAGE_SHIFT) - nr_pages;
 	} else if ((flags & MAP_POPULATE) && !(flags & MAP_NONBLOCK))
 		make_pages_present(addr, addr + len);
@@ -1730,8 +1725,7 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
 	if (!prev || expand_stack(prev, addr))
 		return NULL;
 	if (prev->vm_flags & VM_LOCKED) {
-		if (mlock_vma_pages_range(prev, addr, prev->vm_end) < 0)
-			return NULL;	/* vma gone! */
+		mlock_vma_pages_range(prev, addr, prev->vm_end);
 	}
 	return prev;
 }
@@ -1759,8 +1753,7 @@ find_extend_vma(struct mm_struct * mm, unsigned long addr)
 	if (expand_stack(vma, addr))
 		return NULL;
 	if (vma->vm_flags & VM_LOCKED) {
-		if (mlock_vma_pages_range(vma, addr, start) < 0)
-			return NULL;	/* vma gone! */
+		mlock_vma_pages_range(vma, addr, start);
 	}
 	return vma;
 }
-- 
1.6.5.2



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