• Dale Farnsworth's avatar
    [POWERPC] 85xx: Failure with odd memory sizes and CONFIG_HIGHMEM · 873553b3
    Dale Farnsworth authored
    
    
    The CONFIG_FSL_BOOKE mmu setup code fails when CONFIG_HIGHMEM=y
    and the 3 fixed TLB entries cannot exactly map the lowmem size.
    Each TLB entry can map 4MB, 16MB, 64MB or 256MB, so the failure
    is observed when the kernel lowmem size is not equal to the
    sum of up to 3 of those values.
    
    Normally, memory is sized in nice numbers, but I observed this
    problem while testing a crash dump kernel.  The failure can
    also be observed by artificially reducing the kernel's main
    memory via the mem= kernel command line parameter.
    
    This commit fixes the problem by setting __initial_memory_limit
    in adjust_total_lowmem().
    Signed-off-by: default avatarDale Farnsworth <dale@farnsworth.org>
    Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
    873553b3