• Doug Berger's avatar
    ARM: 8685/1: ensure memblock-limit is pmd-aligned · 9e25ebfe
    Doug Berger authored
    The pmd containing memblock_limit is cleared by prepare_page_table()
    which creates the opportunity for early_alloc() to allocate unmapped
    memory if memblock_limit is not pmd aligned causing a boot-time hang.
    
    Commit 965278dc ("ARM: 8356/1: mm: handle non-pmd-aligned end of RAM")
    attempted to resolve this problem, but there is a path through the
    adjust_lowmem_bounds() routine where if all memory regions start and
    end on pmd-aligned addresses the memblock_limit will be set to
    arm_lowmem_limit.
    
    Since arm_lowmem_limit can be affected by the vmalloc early parameter,
    the value of arm_lowmem_limit may not be pmd-aligned. This commit
    corrects this oversight such that memblock_limit is always rounded
    down to pmd-alignment.
    
    Fixes: 965278dc ("ARM: 8356/1: mm: handle non-pmd-aligned end of RAM")
    Signed-off-by: default avatarDoug Berger <opendmb@gmail.com>
    Suggested-by: default avatarMark Rutland <mark.rutland@arm.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
    9e25ebfe
mmu.c 44.7 KB