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| author | Will Deacon <will.deacon@arm.com> | 2013-11-06 17:20:22 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-12-19 17:43:06 +0000 |
| commit | 12a0ef7b0ac38677bd2d85f33df5ca0a57868819 (patch) | |
| tree | 59b4be2d48b136aac65c7201a975a9463917e020 /arch/arm64/Kconfig | |
| parent | 7158627686f02319c50c8d9d78f75d4c8d126ff2 (diff) | |
| download | lwn-12a0ef7b0ac38677bd2d85f33df5ca0a57868819.tar.gz lwn-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/Kconfig | 2 |
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 |