linux-kernel - Re: [PATCH 11/16] mm: use vm_unmapped

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Date:	Tue, 6 Nov 2012 14:38:35 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	Rik van Riel <riel@...hat.com>, Hugh Dickins <hughd@...gle.com>,
	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>, x86@...nel.org,
	William Irwin <wli@...omorphy.com>, linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH 11/16] mm: use vm_unmapped_area() on arm architecture

On Mon,  5 Nov 2012 14:47:08 -0800
Michel Lespinasse <walken@...gle.com> wrote:

> Update the arm arch_get_unmapped_area[_topdown] functions to make
> use of vm_unmapped_area() instead of implementing a brute force search.

Again,

--- a/arch/arm/mm/mmap.c~mm-use-vm_unmapped_area-on-arm-architecture-fix
+++ a/arch/arm/mm/mmap.c
@@ -11,18 +11,6 @@
 #include <linux/random.h>
 #include <asm/cachetype.h>
 
-static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
-					      unsigned long pgoff)
-{
-	unsigned long base = addr & ~(SHMLBA-1);
-	unsigned long off = (pgoff << PAGE_SHIFT) & (SHMLBA-1);
-
-	if (base + off <= addr)
-		return base + off;
-
-	return base - off;
-}
-
 #define COLOUR_ALIGN(addr,pgoff)		\
 	((((addr)+SHMLBA-1)&~(SHMLBA-1)) +	\
 	 (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
_

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