[PATCH 4.14 027/106] MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48

Greg Kroah-Hartman
2021-12-06T15:08:06Z

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(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 85afd6b4297b2..45a5801ff467b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2990,7 +2990,7 @@ 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

source "init/Kconfig"
--
2.33.0