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authorWill Deacon <will.deacon@arm.com>2013-11-06 17:20:22 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2013-12-19 17:43:06 +0000
commit12a0ef7b0ac38677bd2d85f33df5ca0a57868819 (patch)
tree59b4be2d48b136aac65c7201a975a9463917e020 /arch/arm64/Kconfig
parentarm64: percpu: implement optimised pcpu access using tpidr_el1 (diff)
downloadlinux-dev-12a0ef7b0ac38677bd2d85f33df5ca0a57868819.tar.xz
linux-dev-12a0ef7b0ac38677bd2d85f33df5ca0a57868819.zip
arm64: use generic strnlen_user and strncpy_from_user functions
This patch implements the word-at-a-time interface for arm64 using the same algorithm as ARM. We use the fls64 macro, which expands to a clz instruction via a compiler builtin. Big-endian configurations make use of the implementation from asm-generic. With this implemented, we can replace our byte-at-a-time strnlen_user and strncpy_from_user functions with the optimised generic versions. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d4dd22ee4b7..295bf2de7128 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,6 +17,8 @@ config ARM64
select GENERIC_IRQ_SHOW
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
+ select GENERIC_STRNCPY_FROM_USER
+ select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select HARDIRQS_SW_RESEND
select HAVE_ARCH_TRACEHOOK