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| author | Steve Capper <steve.capper@linaro.org> | 2014-10-09 15:29:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:26:01 -0400 |
| commit | b8cd51afe05a98ef907e61c603d5c5b7ad6242d8 (patch) | |
| tree | b0da97d39da9ddd9dabf5f033e9c0555ec374e6e /arch/arm/Kconfig | |
| parent | a0ad5496b2b3accf09ab9485ad0170e3b4b1cb27 (diff) | |
| download | lwn-b8cd51afe05a98ef907e61c603d5c5b7ad6242d8.tar.gz lwn-b8cd51afe05a98ef907e61c603d5c5b7ad6242d8.zip | |
arm: mm: enable RCU fast_gup
Activate the RCU fast_gup for ARM. We also need to force THP splits to
broadcast an IPI s.t. we block in the fast_gup page walker. As THP
splits are comparatively rare, this should not lead to a noticeable
performance degradation.
Some pre-requisite functions pud_write and pud_page are also added.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index eafe6aea64ff..18f392f8b744 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1661,6 +1661,10 @@ config ARCH_SELECT_MEMORY_MODEL config HAVE_ARCH_PFN_VALID def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM +config HAVE_GENERIC_RCU_GUP + def_bool y + depends on ARM_LPAE + config HIGHMEM bool "High Memory Support" depends on MMU |