[uclibc-ng-devel] [PATCH 2/3] ARC: introduce explicit support for atomics

Signed-off-by: Vineet Gupta <vgupta(a)synopsys.com> --- extra/Configs/Config.arc | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/extra/Configs/Config.arc b/extra/Configs/Config.arc index 0c0bc71ce2fc..c263dbf46028 100644 --- a/extra/Configs/Config.arc +++ b/extra/Configs/Config.arc @@ -28,6 +28,14 @@ config CONFIG_ARC_CPU_HS endchoice +config CONFIG_ARC_HAS_ATOMICS + bool "Support for LLOCK/SCOND instructions" + default y + help + LLOCK/SCOND instructions are needed to implement atomic r-m-w + Otherwise libc needs kernel assisted atomic cmpxchg available + since v4.9 kernel + choice prompt "MMU Page Size" default CONFIG_ARC_PAGE_SIZE_8K -- 2.7.4