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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:00:51 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:02:35 +0000 |
| commit | 716a3dc20084da9b3ab17bd125005a5345e23e3b (patch) | |
| tree | f7ba487050d33fc2913fdee81b384f5578ccb105 /arch/arm/mach-omap2/Kconfig | |
| parent | 4de3a8e101150feaefa1139611a50ff37467f33e (diff) | |
| download | blackbird-op-linux-716a3dc20084da9b3ab17bd125005a5345e23e3b.tar.gz blackbird-op-linux-716a3dc20084da9b3ab17bd125005a5345e23e3b.zip | |
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-omap2/Kconfig')
| -rw-r--r-- | arch/arm/mach-omap2/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index 904bd1dfcd2e..a8ba7b96dcd1 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -366,8 +366,8 @@ config OMAP3_SDRC_AC_TIMING going on could result in system crashes; config OMAP4_ERRATA_I688 - bool "OMAP4 errata: Async Bridge Corruption" - depends on ARCH_OMAP4 + bool "OMAP4 errata: Async Bridge Corruption (BROKEN)" + depends on ARCH_OMAP4 && BROKEN select ARCH_HAS_BARRIERS help If a data is stalled inside asynchronous bridge because of back |
