linux-kernel - [PATCH v5 6/6] powerpc/8xx: Increase number of slices to 64

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Message-Id: <23e87f3c2d45a12219bb30e93707773f72ff78f9.1519305412.git.christophe.leroy@c-s.fr>
Date:   Thu, 22 Feb 2018 15:27:30 +0100 (CET)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>, aneesh.kumar@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Nicholas Piggin <npiggin@...il.com>
Subject: [PATCH v5 6/6] powerpc/8xx: Increase number of slices to 64

On the 8xx, the minimum slice size is the size of the area
covered by a single PMD entry, ie 4M in 4K pages mode and 64M in
16K pages mode.

This patch increases the number of slices from 16 to 64 on the 8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 v4: New
 v5: No change

 arch/powerpc/include/asm/nohash/32/slice.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/nohash/32/slice.h b/arch/powerpc/include/asm/nohash/32/slice.h
index 95d532e18092..777d62e40ac0 100644
--- a/arch/powerpc/include/asm/nohash/32/slice.h
+++ b/arch/powerpc/include/asm/nohash/32/slice.h
@@ -4,7 +4,7 @@
 
 #ifdef CONFIG_PPC_MM_SLICES
 
-#define SLICE_LOW_SHIFT		28
+#define SLICE_LOW_SHIFT		26	/* 64 slices */
 #define SLICE_LOW_TOP		(0x100000000ull)
 #define SLICE_NUM_LOW		(SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
 #define GET_LOW_SLICE_INDEX(addr)	((addr) >> SLICE_LOW_SHIFT)
-- 
2.13.3