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    Subject[PATCH 4.18 033/145] powerpc/pkeys: Fix calculation of total pkeys.
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

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

    From: Ram Pai <linuxram@us.ibm.com>

    commit fe6a2804e65969a574377bdb3605afb79e6091a9 upstream.

    Total number of pkeys calculation is off by 1. Fix it.

    Fixes: 4fb158f65ac5 ("powerpc: track allocation status of all pkeys")
    Cc: stable@vger.kernel.org # v4.16+
    Signed-off-by: Ram Pai <linuxram@us.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

    --- a/arch/powerpc/mm/pkeys.c
    +++ b/arch/powerpc/mm/pkeys.c
    @@ -92,7 +92,7 @@ int pkey_initialize(void)
    * arch-neutral code.
    */
    pkeys_total = min_t(int, pkeys_total,
    - (ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT));
    + ((ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)+1));

    if (!pkey_mmu_enabled() || radix_enabled() || !pkeys_total)
    static_branch_enable(&pkey_disabled);

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