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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:00:51 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:02:35 (GMT) |
| commit | 716a3dc20084da9b3ab17bd125005a5345e23e3b (patch) | |
| tree | f7ba487050d33fc2913fdee81b384f5578ccb105 /arch/arm/mach-imx/mach-mx31moboard.c | |
| parent | 4de3a8e101150feaefa1139611a50ff37467f33e (diff) | |
| download | linux-716a3dc20084da9b3ab17bd125005a5345e23e3b.tar.xz | |
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-mx31moboard.c')
| -rw-r--r-- | arch/arm/mach-imx/mach-mx31moboard.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/arm/mach-imx/mach-mx31moboard.c b/arch/arm/mach-imx/mach-mx31moboard.c index b95981d..f225262 100644 --- a/arch/arm/mach-imx/mach-mx31moboard.c +++ b/arch/arm/mach-imx/mach-mx31moboard.c @@ -41,6 +41,7 @@ #include <asm/mach/arch.h> #include <asm/mach/time.h> #include <asm/mach/map.h> +#include <asm/memblock.h> #include <mach/board-mx31moboard.h> #include <mach/common.h> #include <mach/hardware.h> @@ -584,10 +585,8 @@ struct sys_timer mx31moboard_timer = { static void __init mx31moboard_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(MX31MOBOARD, "EPFL Mobots mx31moboard") |