linux-kernel - [PATCH 2/8] mm: use vm_unmapped

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Message-Id: <1357694895-520-3-git-send-email-walken@google.com>
Date:	Tue,  8 Jan 2013 17:28:09 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Rik van Riel <riel@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Matt Turner <mattst88@...il.com>,
	David Howells <dhowells@...hat.com>,
	Tony Luck <tony.luck@...el.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-parisc@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org
Subject: [PATCH 2/8] mm: use vm_unmapped_area() on alpha architecture

Update the alpha arch_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.

Signed-off-by: Michel Lespinasse <walken@...gle.com>

---
 arch/alpha/kernel/osf_sys.c |   20 +++++++++-----------
 1 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 14db93e4c8a8..ba707e23ef37 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1298,17 +1298,15 @@ static unsigned long
 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
 		         unsigned long limit)
 {
-	struct vm_area_struct *vma = find_vma(current->mm, addr);
-
-	while (1) {
-		/* At this point:  (!vma || addr < vma->vm_end). */
-		if (limit - len < addr)
-			return -ENOMEM;
-		if (!vma || addr + len <= vma->vm_start)
-			return addr;
-		addr = vma->vm_end;
-		vma = vma->vm_next;
-	}
+	struct vm_unmapped_area_info info;
+
+	info.flags = 0;
+	info.length = len;
+	info.low_limit = addr;
+	info.high_limit = limit;
+	info.align_mask = 0;
+	info.align_offset = 0;
+	return vm_unmapped_area(&info);
 }
 
 unsigned long
-- 
1.7.7.3
--
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