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    Subject[PATCH 4.14 171/193] powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

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

    From: Nicholas Piggin <npiggin@gmail.com>

    commit 35602f82d0c765f991420e319c8d3a596c921eb8 upstream.

    While mapping hints with a length that cross 128TB are disallowed,
    MAP_FIXED allocations that cross 128TB are allowed. These are failing
    on hash (on radix they succeed). Add an additional case for fixed
    mappings to expand the addr_limit when crossing 128TB.

    Fixes: f4ea6dcb08ea ("powerpc/mm: Enable mappings above 128TB")
    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
    Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/powerpc/mm/slice.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/powerpc/mm/slice.c
    +++ b/arch/powerpc/mm/slice.c
    @@ -418,7 +418,7 @@ unsigned long slice_get_unmapped_area(un
    unsigned long high_limit;

    high_limit = DEFAULT_MAP_WINDOW;
    - if (addr >= high_limit)
    + if (addr >= high_limit || (fixed && (addr + len > high_limit)))
    high_limit = TASK_SIZE;

    if (len > high_limit)

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