"Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com> writes:
> futex_detect_cmpxchg() does a cmpxchg_futex_value_locked on a NULL user addr
> to
> runtime detect whether architecture implements atomic cmpxchg for futex. POWER
> do implement the feature and hence we can enable the config instead of
> depending
> on runtime detection.
>
> We could possible enable this on everything. For now limitted to book3s_64
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> arch/powerpc/platforms/Kconfig.cputype | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/platforms/Kconfig.cputype
> b/arch/powerpc/platforms/Kconfig.cputype
> index a429d859f15d..31bc2bd5dfd1 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -75,6 +75,7 @@ config PPC_BOOK3S_64
> select ARCH_SUPPORTS_NUMA_BALANCING
> select IRQ_WORK
> select HAVE_KERNEL_XZ
> + select HAVE_FUTEX_CMPXCHG if FUTEX
I'd rather it was under config PPC with an if BOOK3S_64 check. Just so
that all those top-level style configs are in once place.
eg.
config PPC
...
select HAVE_FUTEX_CMPXCHG if FUTEX && PPC_BOOK3S_64
cheers
