• Russell King's avatar
    ARM: Add arm_memblock_steal() to allocate memory away from the kernel · 716a3dc2
    Russell King authored
    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 137d105d (ARM: OMAP4: Fix
    errata i688 with MPU interconnect barriers.) reverted until such
    time it can be fixed correctly.
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    716a3dc2
mach-mx31moboard.c 15.8 KB