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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 028/191] powerpc/64s/hash: Fix stab_rr off by one
 initialization
Date: Sat,  9 Nov 2019 21:37:30 -0500
Message-Id: <20191110024013.29782-28-sashal@kernel.org>
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Cc: Sasha Levin <sashal@kernel.org>, linuxppc-dev@lists.ozlabs.org,
 Nicholas Piggin <npiggin@gmail.com>
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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