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[4.19,52/69] MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48

Message ID 20211129181705.348252154@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Nov. 29, 2021, 6:18 p.m. UTC 
From: Huang Pei <huangpei@loongson.cn>

[ Upstream commit 41ce097f714401e6ad8f3f5eb30d7f91b0b5e495 ]

It hangup when booting Loongson 3A1000 with BOTH
CONFIG_PAGE_SIZE_64KB and CONFIG_MIPS_VA_BITS_48, that it turn
out to use 2-level pgtable instead of 3-level. 64KB page size
with 2-level pgtable only cover 42 bits VA, use 3-level pgtable
to cover all 48 bits VA(55 bits)

Fixes: 1e321fa917fb ("MIPS64: Support of at least 48 bits of SEGBITS)
Signed-off-by: Huang Pei <huangpei@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/mips/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e513528be3ad7..8a227a80f6bd5 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2991,7 +2991,7 @@  config HAVE_LATENCYTOP_SUPPORT
 config PGTABLE_LEVELS
 	int
 	default 4 if PAGE_SIZE_4KB && MIPS_VA_BITS_48
-	default 3 if 64BIT && !PAGE_SIZE_64KB
+	default 3 if 64BIT && (!PAGE_SIZE_64KB || MIPS_VA_BITS_48)
 	default 2
 
 config MIPS_AUTO_PFN_OFFSET