This is a note to let you know that I've just added the patch titled
MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-use-3-level-pgtable-for-64kb-page-size-on-mips_.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 951199bddc70f4a342c13155c9462a98d7b21262
Author: Huang Pei <huangpei@xxxxxxxxxxx>
Date: Thu Nov 25 18:59:48 2021 +0800
MIPS: use 3-level pgtable for 64KB page size on MIPS_VA_BITS_48
[ 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@xxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9749818eed6d6..2811ecc1f3c71 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -3059,7 +3059,7 @@ config STACKTRACE_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
