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    Subject[PATCH 4.19 262/422] powerpc/64s/hash: Fix stab_rr off by one initialization
    Date
    From: Nicholas Piggin <npiggin@gmail.com>

    [ Upstream commit 09b4438db13fa83b6219aee5993711a2aa2a0c64 ]

    This causes SLB alloation to start 1 beyond the start of the SLB.
    There is no real problem because after it wraps it stats behaving
    properly, it's just surprisig to see when looking at SLB traces.

    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/powerpc/mm/slb.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
    index 9f574e59d1786..2f162c6e52d4f 100644
    --- a/arch/powerpc/mm/slb.c
    +++ b/arch/powerpc/mm/slb.c
    @@ -355,7 +355,7 @@ void slb_initialize(void)
    #endif
    }

    - get_paca()->stab_rr = SLB_NUM_BOLTED;
    + get_paca()->stab_rr = SLB_NUM_BOLTED - 1;

    lflags = SLB_VSID_KERNEL | linear_llp;
    vflags = SLB_VSID_KERNEL | vmalloc_llp;
    --
    2.20.1


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