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sh: Disable 4kB pages on extended mode TLB. 

4kB pages are unstable on extended mode TLB, it's recommended
that TLB compat mode be used when using a 4kB PAGE_SIZE. Set
the default for extended mode to 8kB.

This should have negligible impact, as other than the extra swap
cache entry bits, there's no reason to use the extended mode TLB
with 4kB pages.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
hifive-unleashed-5.1
Paul Mundt 2007-09-27 10:47:00 +09:00
parent 26fad19d8c
commit 4d2cab7c00
1 changed files with 5 additions and 3 deletions
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8
arch/sh/mm/Kconfig
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@ -336,25 +336,27 @@ config ARCH_MEMORY_PROBE
choice
prompt "Kernel page size"
default PAGE_SIZE_8KB if X2TLB
default PAGE_SIZE_4KB
config PAGE_SIZE_4KB
bool "4kB"
depends on !X2TLB
help
This is the default page size used by all SuperH CPUs.
config PAGE_SIZE_8KB
bool "8kB"
depends on EXPERIMENTAL && X2TLB
depends on X2TLB
help
This enables 8kB pages as supported by SH-X2 and later MMUs.
config PAGE_SIZE_64KB
bool "64kB"
depends on EXPERIMENTAL && CPU_SH4
depends on CPU_SH4
help
This enables support for 64kB pages, possible on all SH-4
CPUs and later. Highly experimental, not recommended.
CPUs and later.
endchoice