powerpc/64s/hash: Fix stab_rr off by one initialization

[ 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>

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 64c9a91773af48449f3886dd0ab29df3f1b66f6e..96c41b55b106bbd4c3fc538c316f96e76480b464 100644 (file)
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -321,7 +321,7 @@ 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;