Commit 4d2cab7c authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 26fad19d

arch/sh/mm/Kconfig

+5 −3
Original line number Diff line number Diff line
@@ -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