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| author | Vineet Gupta <vgupta@synopsys.com> | 2016-02-10 06:52:07 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-02-12 12:10:25 +0530 |
| commit | 37eda9df5bd8444263418495632ea6ec750f03f9 (patch) | |
| tree | 2336e3a18d082fda05e907158b61fa34e2bcde7c /arch/arc/Kconfig | |
| parent | dec2b2849cfccf09822d6ce3f9bc84b8c8611152 (diff) | |
| download | lwn-37eda9df5bd8444263418495632ea6ec750f03f9.tar.gz lwn-37eda9df5bd8444263418495632ea6ec750f03f9.zip | |
ARC: mm: Introduce explicit super page size support
MMUv4 supports 2 concurrent page sizes: Normal and Super [4K to 16M]
So far Linux supported a single super page size for a given Normal page,
depending on the software page walking address split.
e.g. we had 11:8:13 address split for 8K page, which meant super page
was 2 ^(8+13) = 2M (given that THP size has to be PMD_SHIFT)
Now we turn this around, by allowing multiple Super Pages in Kconfig
(currently 2M and 16M only) and forcing page walker address split to
PGDIR_SHIFT and PAGE_SHIFT
For configs without Super page, things are same as before and
PGDIR_SHIFT can be hacked to get non default address split
The motivation for this change is a customer who needs 16M super page
and a 8K Normal page combo.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/Kconfig')
| -rw-r--r-- | arch/arc/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index bb15e8062b1f..63979c7eede5 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -341,6 +341,19 @@ config ARC_PAGE_SIZE_4K endchoice +choice + prompt "MMU Super Page Size" + depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE + default ARC_HUGEPAGE_2M + +config ARC_HUGEPAGE_2M + bool "2MB" + +config ARC_HUGEPAGE_16M + bool "16MB" + +endchoice + if ISA_ARCOMPACT config ARC_COMPACT_IRQ_LEVELS @@ -569,6 +582,12 @@ endmenu endmenu # "ARC Architecture Configuration" source "mm/Kconfig" + +config FORCE_MAX_ZONEORDER + int "Maximum zone order" + default "12" if ARC_HUGEPAGE_16M + default "11" + source "net/Kconfig" source "drivers/Kconfig" source "fs/Kconfig" |