• Santosh Shilimkar's avatar
    ARM: 7952/1: mm: Fix the memblock allocation for LPAE machines · ca474408
    Santosh Shilimkar authored
    Commit ad6492b8 added much needed memblock_virt_alloc_low() and further
    commit 07bacb38 {memblock, bootmem: restore goal for alloc_low} fixed
    the issue with low memory limit thanks to Yinghai. But even after all
    these fixes, there is still one case where the limit check done with
    ARCH_LOW_ADDRESS_LIMIT for low memory fails. Russell pointed out the
    issue with 32 bit LPAE machines in below thread.
    	https://lkml.org/lkml/2014/1/28/364
    
    Since on some LPAE machines where memory start address is beyond 4GB,
    the low memory marker in memblock will be set to default
    ARCH_LOW_ADDRESS_LIMIT which is wrong. We can fix this by letting
    architectures set the ARCH_LOW_ADDRESS_LIMIT using another export
    similar to memblock_set_current_limit() but am not sure whether
    its worth the trouble. Tell me if you think otherwise.
    
    Rather am just trying to fix that one broken case using
    memblock_virt_alloc() in setup code since the memblock.current_limit
    is updated appropriately makes it work on all ARM 32 bit machines.
    
    Cc: Yinghai Lu <yinghai@kernel.org>
    Cc: Strashko, Grygorii <grygorii.strashko@ti.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    ca474408
setup.c 25.3 KB