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    Subject[PATCH 4.19 222/280] powerpc/wii: properly disable use of BATs when requested.
    Date
    4.19-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Christophe Leroy <christophe.leroy@c-s.fr>

    commit 6d183ca8baec983dc4208ca45ece3c36763df912 upstream.

    'nobats' kernel parameter or some options like CONFIG_DEBUG_PAGEALLOC
    deny the use of BATS for mapping memory.

    This patch makes sure that the specific wii RAM mapping function
    takes it into account as well.

    Fixes: de32400dd26e ("wii: use both mem1 and mem2 as ram")
    Cc: stable@vger.kernel.org
    Reviewed-by: Jonathan Neuschafer <j.neuschaefer@gmx.net>
    Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/platforms/embedded6xx/wii.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/arch/powerpc/platforms/embedded6xx/wii.c
    +++ b/arch/powerpc/platforms/embedded6xx/wii.c
    @@ -83,6 +83,10 @@ unsigned long __init wii_mmu_mapin_mem2(
    /* MEM2 64MB@0x10000000 */
    delta = wii_hole_start + wii_hole_size;
    size = top - delta;
    +
    + if (__map_without_bats)
    + return delta;
    +
    for (bl = 128<<10; bl < max_size; bl <<= 1) {
    if (bl * 2 > size)
    break;

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