-----Original Message-----
> Date: Wed, 10 May 2017 03:16:43 -0700
> From: Ashwin Sekhar T K <ashwin.sek...@caviumnetworks.com>
> To: tho...@monjalon.net, jerin.ja...@caviumnetworks.com,
> maciej.cze...@caviumnetworks.com, vikto...@rehivetech.com,
> jianbo....@linaro.org, bruce.richard...@intel.com,
> pablo.de.lara.gua...@intel.com, konstantin.anan...@intel.com
> Cc: dev@dpdk.org, Ashwin Sekhar T K <ashwin.sek...@caviumnetworks.com>
> Subject: [dpdk-dev] [PATCH 6/6] eal: fix warning seen with armv8a clang
> X-Mailer: git-send-email 2.13.0.rc1
>
> Fixed warning -Wempty-body seen with armv8a clang compilation.
>
> Signed-off-by: Ashwin Sekhar T K <ashwin.sek...@caviumnetworks.com>
> ---
> lib/librte_eal/linuxapp/eal/Makefile | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/lib/librte_eal/linuxapp/eal/Makefile
> b/lib/librte_eal/linuxapp/eal/Makefile
> index 640afd088..dea1c1d59 100644
> --- a/lib/librte_eal/linuxapp/eal/Makefile
> +++ b/lib/librte_eal/linuxapp/eal/Makefile
> @@ -126,6 +126,10 @@ ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
> CFLAGS_eal_thread.o += -Wno-return-type
> endif
>
> +ifeq ($(CONFIG_RTE_ARCH_ARM64)$(CONFIG_RTE_TOOLCHAIN_CLANG),yy)
> +CFLAGS_eal_common_launch.o += -Wno-empty-body
> +endif
clang pointed us an improvement here. You can add rte_pause() to reduce
the power usage while waiting in rte_eal_wait_lcore().
That will remove the need for -Wno-empty-body for clang too.
➜ [master][dpdk-master] $ git diff
diff --git a/lib/librte_eal/common/eal_common_launch.c
b/lib/librte_eal/common/eal_common_launch.c
index 229c3a0..1848466 100644
--- a/lib/librte_eal/common/eal_common_launch.c
+++ b/lib/librte_eal/common/eal_common_launch.c
@@ -54,7 +54,8 @@ rte_eal_wait_lcore(unsigned slave_id)
return 0;
while (lcore_config[slave_id].state != WAIT &&
- lcore_config[slave_id].state != FINISHED);
+ lcore_config[slave_id].state != FINISHED)
+ rte_pause();
> +
> INC := rte_interrupts.h rte_kni_common.h rte_dom0_common.h
>
> SYMLINK-$(CONFIG_RTE_EXEC_ENV_LINUXAPP)-include/exec-env := \
> --
> 2.13.0.rc1
>
