linux-kernel - [PATCH] ARM: pxa: Move iotable mapping inside vmalloc region

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Date:	Sun, 24 Nov 2013 09:36:11 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Cc:	linux@....linux.org.uk, eric.y.miao@...il.com,
	haojian.zhuang@...il.com,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: [PATCH] ARM: pxa: Move iotable mapping inside vmalloc region

In order to remove the following ugly message:

  BUG: mapping for 0x00000000 at 0xff000000 out of vmalloc space

the iotable mappings should be re-located inside the vmalloc
region. Such move was introduced at commit:

commit 0536bdf33faff4d940ac094c77998cfac368cfff
Author: Nicolas Pitre <nicolas.pitre@...aro.org>
Date:   Thu Aug 25 00:35:59 2011 -0400

    ARM: move iotable mappings within the vmalloc region

While at it, let's add some nicer defines to make the code
more readable.

Cc: Nicolas Pitre <nicolas.pitre@...aro.org>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
---
 arch/arm/mach-pxa/generic.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 4225417..7c01095 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -24,6 +24,7 @@
 #include <mach/hardware.h>
 #include <asm/mach/map.h>
 #include <asm/mach-types.h>
+#include <asm/pgtable.h>
 
 #include <mach/reset.h>
 #include <mach/smemc.h>
@@ -77,6 +78,11 @@ EXPORT_SYMBOL(get_clk_frequency_khz);
  * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  *       and cache flush area.
  */
+
+#define UNCACHED_PHY	0x00000000
+#define UNCACHED_SIZE	SZ_1M
+#define UNCACHED_VIRT	(VMALLOC_END - UNCACHED_SIZE)
+
 static struct map_desc common_io_desc[] __initdata = {
   	{	/* Devs */
 		.virtual	=  0xf2000000,
@@ -84,9 +90,9 @@ static struct map_desc common_io_desc[] __initdata = {
 		.length		= 0x02000000,
 		.type		= MT_DEVICE
 	}, {	/* UNCACHED_PHYS_0 */
-		.virtual	= 0xff000000,
-		.pfn		= __phys_to_pfn(0x00000000),
-		.length		= 0x00100000,
+		.virtual	= UNCACHED_VIRT,
+		.pfn		= __phys_to_pfn(UNCACHED_PHY),
+		.length		= UNCACHED_SIZE,
 		.type		= MT_DEVICE
 	}
 };
-- 
1.8.1.5

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