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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-01-13 15:00:51 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-01-13 15:02:35 +0000
commit716a3dc20084da9b3ab17bd125005a5345e23e3b (patch)
treef7ba487050d33fc2913fdee81b384f5578ccb105 /arch/arm/mach-imx/mach-pcm037.c
parent4de3a8e101150feaefa1139611a50ff37467f33e (diff)
downloadlinux-716a3dc20084da9b3ab17bd125005a5345e23e3b.tar.gz
ARM: Add arm_memblock_steal() to allocate memory away from the kernel
Several platforms are now using the memblock_alloc+memblock_free+ memblock_remove trick to obtain memory which won't be mapped in the kernel's page tables. Most platforms do this (correctly) in the ->reserve callback. However, OMAP has started to call these functions outside of this callback, and this is extremely unsafe - memory will not be unmapped, and could well be given out after memblock is no longer responsible for its management. So, provide arm_memblock_steal() to perform this function, and ensure that it panic()s if it is used inappropriately. Convert everyone over, including OMAP. As a result, OMAP with OMAP4_ERRATA_I688 enabled will panic on boot with this change. Mark this option as BROKEN and make it depend on BROKEN. OMAP needs to be fixed, or 137d105d50 (ARM: OMAP4: Fix errata i688 with MPU interconnect barriers.) reverted until such time it can be fixed correctly. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-imx/mach-pcm037.c')
-rw-r--r--arch/arm/mach-imx/mach-pcm037.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/arm/mach-imx/mach-pcm037.c b/arch/arm/mach-imx/mach-pcm037.c
index d7e151669ed..e48854b9d99 100644
--- a/arch/arm/mach-imx/mach-pcm037.c
+++ b/arch/arm/mach-imx/mach-pcm037.c
@@ -39,6 +39,7 @@
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>
+#include <asm/memblock.h>
#include <mach/common.h>
#include <mach/hardware.h>
#include <mach/iomux-mx3.h>
@@ -680,10 +681,8 @@ struct sys_timer pcm037_timer = {
static void __init pcm037_reserve(void)
{
/* reserve 4 MiB for mx3-camera */
- mx3_camera_base = memblock_alloc(MX3_CAMERA_BUF_SIZE,
+ mx3_camera_base = arm_memblock_steal(MX3_CAMERA_BUF_SIZE,
MX3_CAMERA_BUF_SIZE);
- memblock_free(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
- memblock_remove(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
}
MACHINE_START(PCM037, "Phytec Phycore pcm037")