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authorSteve Capper <steve.capper@linaro.org>2014-10-09 15:29:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-09 22:26:01 -0400
commit29e5694054149acd25b0d5538c95fb6d64478315 (patch)
tree1f496525d51e1989b3415bf275034213a639bbc8 /arch/arm64/Kconfig
parent5e5f6dc10546f5c03bc572e3ba3089af30c66e2d (diff)
downloadlinux-29e5694054149acd25b0d5538c95fb6d64478315.tar.bz2
arm64: mm: enable RCU fast_gup
Activate the RCU fast_gup for ARM64. 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. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Steve Capper <steve.capper@linaro.org> Tested-by: Dann Frazier <dann.frazier@canonical.com> Acked-by: Catalin Marinas <catalin.marinas@arm.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/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1ffd9a05206b..73bfb477ca0d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -111,6 +111,9 @@ config GENERIC_CALIBRATE_DELAY
config ZONE_DMA
def_bool y
+config HAVE_GENERIC_RCU_GUP
+ def_bool y
+
config ARCH_DMA_ADDR_T_64BIT
def_bool y