[dpdk-stable] patch 'mk: disable gcc AVX512F support' has been queued to stable release 18.08.1

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 18.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/29/18. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the patch applied
to the branch. If the code is different (ie: not only metadata diffs), due for example to
a change in context or macro names, please double check it.

Thanks.

Kevin Traynor

---
>From 7eb9c15c03b76ad9649356e1c52e21caf921f1aa Mon Sep 17 00:00:00 2001
From: Yongseok Koh <yskoh at mellanox.com>
Date: Sat, 3 Nov 2018 01:06:32 +0000
Subject: [PATCH] mk: disable gcc AVX512F support

[ upstream commit 8d07c82b239f7782be0d3afbb626390e2cb0c8f5 ]

This is a workaround to prevent a crash, which might be caused by
optimization of newer gcc (7.3.0) on Intel Skylake.

This disables AVX512F support of gcc by adding -mno-avx512f if it is
disabled in DPDK (CONFIG_RTE_ENABLE_AVX512=n).

This does not apply to the meson build as that doesn't have such an option
but always enable AVX512F whenever supported.

Bugzilla ID: 97

Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
 mk/rte.cpuflags.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk
index 43ed84155..c3291b17a 100644
--- a/mk/rte.cpuflags.mk
+++ b/mk/rte.cpuflags.mk
@@ -69,4 +69,9 @@ ifneq ($(filter $(AUTO_CPUFLAGS),__AVX512F__),)
 ifeq ($(CONFIG_RTE_ENABLE_AVX512),y)
 CPUFLAGS += AVX512F
+else
+# disable AVX512F support of gcc as a workaround for Bug 97
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+MACHINE_CFLAGS += -mno-avx512f
+endif
 endif
 endif
-- 
2.19.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2018-11-23 10:22:54.633556224 +0000
+++ 0015-mk-disable-gcc-AVX512F-support.patch	2018-11-23 10:22:54.000000000 +0000
@@ -1,8 +1,10 @@
-From 8d07c82b239f7782be0d3afbb626390e2cb0c8f5 Mon Sep 17 00:00:00 2001
+From 7eb9c15c03b76ad9649356e1c52e21caf921f1aa Mon Sep 17 00:00:00 2001
 From: Yongseok Koh <yskoh at mellanox.com>
 Date: Sat, 3 Nov 2018 01:06:32 +0000
 Subject: [PATCH] mk: disable gcc AVX512F support
 
+[ upstream commit 8d07c82b239f7782be0d3afbb626390e2cb0c8f5 ]
+
 This is a workaround to prevent a crash, which might be caused by
 optimization of newer gcc (7.3.0) on Intel Skylake.
 
@@ -13,7 +15,6 @@
 but always enable AVX512F whenever supported.
 
 Bugzilla ID: 97
-Cc: stable at dpdk.org
 
 Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
 ---