From 635af6abf583f1e17860c0eb72cfe74b474bdfdf Mon Sep 17 00:00:00 2001
From: Michał Górny <mgorny@gentoo.org>
Date: Sat, 30 Dec 2017 23:30:29 +0100
Subject: sys-libs/libomp: Disallow kernels with PDU scheduler

The PDU scheduler (used e.g. in current versions of -pf kernel) does not
implement the sched_yield() call which is used by the OpenMP
implementation to switch between threads. As a result, using OpenMP with
this scheduler results in horrible performance with 100% CPU usage
on looped noop syscall calls.

Closes: https://bugs.gentoo.org/638410
---
 sys-libs/libomp/libomp-4.0.1.ebuild | 13 ++++++++++---
 sys-libs/libomp/libomp-5.0.0.ebuild | 13 ++++++++++---
 sys-libs/libomp/libomp-5.0.1.ebuild | 13 ++++++++++---
 sys-libs/libomp/libomp-9999.ebuild  | 13 ++++++++++---
 4 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/sys-libs/libomp/libomp-4.0.1.ebuild b/sys-libs/libomp/libomp-4.0.1.ebuild
index 2eed580030c3..299e49921e10 100644
--- a/sys-libs/libomp/libomp-4.0.1.ebuild
+++ b/sys-libs/libomp/libomp-4.0.1.ebuild
@@ -8,7 +8,7 @@ EAPI=6
 CMAKE_MIN_VERSION=3.7.0-r1
 PYTHON_COMPAT=( python2_7 )
 
-inherit cmake-multilib python-any-r1
+inherit cmake-multilib linux-info python-any-r1
 
 DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
 HOMEPAGE="https://openmp.llvm.org"
@@ -22,8 +22,7 @@ LICENSE="|| ( UoI-NCSA MIT ) MIT LLVM-Grant"
 SLOT="0"
 KEYWORDS="amd64 ~arm64 x86"
 IUSE="hwloc ompt test"
-# Restrict tests to avoid hanging, https://bugs.gentoo.org/638410
-RESTRICT="test"
+RESTRICT="!test? ( test )"
 
 RDEPEND="hwloc? ( sys-apps/hwloc:0=[${MULTILIB_USEDEP}] )"
 # tests:
@@ -43,11 +42,19 @@ S=${WORKDIR}/openmp-${PV/_/}.src
 # least intrusive of all
 CMAKE_BUILD_TYPE=RelWithDebInfo
 
+CONFIG_CHECK="~!SCHED_PDS"
+ERROR_SCHED_PDS="PDS scheduler is not supported as it does not implement sched_yield()"
+
 python_check_deps() {
 	has_version "dev-python/lit[${PYTHON_USEDEP}]"
 }
 
+pkg_pretend() {
+	linux-info_pkg_setup
+}
+
 pkg_setup() {
+	linux-info_pkg_setup
 	use test && python-any-r1_pkg_setup
 }
 
diff --git a/sys-libs/libomp/libomp-5.0.0.ebuild b/sys-libs/libomp/libomp-5.0.0.ebuild
index f90baa29e665..87c3bfe493f6 100644
--- a/sys-libs/libomp/libomp-5.0.0.ebuild
+++ b/sys-libs/libomp/libomp-5.0.0.ebuild
@@ -8,7 +8,7 @@ EAPI=6
 CMAKE_MIN_VERSION=3.7.0-r1
 PYTHON_COMPAT=( python2_7 )
 
-inherit cmake-multilib python-any-r1
+inherit cmake-multilib linux-info python-any-r1
 
 DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
 HOMEPAGE="https://openmp.llvm.org"
@@ -22,8 +22,7 @@ LICENSE="|| ( UoI-NCSA MIT ) MIT LLVM-Grant"
 SLOT="0"
 KEYWORDS="~amd64 ~arm64 ~x86"
 IUSE="hwloc ompt test"
-# Restrict tests to avoid hanging, https://bugs.gentoo.org/638410
-RESTRICT="test"
+RESTRICT="!test? ( test )"
 
 RDEPEND="hwloc? ( sys-apps/hwloc:0=[${MULTILIB_USEDEP}] )"
 # tests:
@@ -43,11 +42,19 @@ S=${WORKDIR}/openmp-${PV/_/}.src
 # least intrusive of all
 CMAKE_BUILD_TYPE=RelWithDebInfo
 
+CONFIG_CHECK="~!SCHED_PDS"
+ERROR_SCHED_PDS="PDS scheduler is not supported as it does not implement sched_yield()"
+
 python_check_deps() {
 	has_version "dev-python/lit[${PYTHON_USEDEP}]"
 }
 
+pkg_pretend() {
+	linux-info_pkg_setup
+}
+
 pkg_setup() {
+	linux-info_pkg_setup
 	use test && python-any-r1_pkg_setup
 }
 
diff --git a/sys-libs/libomp/libomp-5.0.1.ebuild b/sys-libs/libomp/libomp-5.0.1.ebuild
index f90baa29e665..87c3bfe493f6 100644
--- a/sys-libs/libomp/libomp-5.0.1.ebuild
+++ b/sys-libs/libomp/libomp-5.0.1.ebuild
@@ -8,7 +8,7 @@ EAPI=6
 CMAKE_MIN_VERSION=3.7.0-r1
 PYTHON_COMPAT=( python2_7 )
 
-inherit cmake-multilib python-any-r1
+inherit cmake-multilib linux-info python-any-r1
 
 DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
 HOMEPAGE="https://openmp.llvm.org"
@@ -22,8 +22,7 @@ LICENSE="|| ( UoI-NCSA MIT ) MIT LLVM-Grant"
 SLOT="0"
 KEYWORDS="~amd64 ~arm64 ~x86"
 IUSE="hwloc ompt test"
-# Restrict tests to avoid hanging, https://bugs.gentoo.org/638410
-RESTRICT="test"
+RESTRICT="!test? ( test )"
 
 RDEPEND="hwloc? ( sys-apps/hwloc:0=[${MULTILIB_USEDEP}] )"
 # tests:
@@ -43,11 +42,19 @@ S=${WORKDIR}/openmp-${PV/_/}.src
 # least intrusive of all
 CMAKE_BUILD_TYPE=RelWithDebInfo
 
+CONFIG_CHECK="~!SCHED_PDS"
+ERROR_SCHED_PDS="PDS scheduler is not supported as it does not implement sched_yield()"
+
 python_check_deps() {
 	has_version "dev-python/lit[${PYTHON_USEDEP}]"
 }
 
+pkg_pretend() {
+	linux-info_pkg_setup
+}
+
 pkg_setup() {
+	linux-info_pkg_setup
 	use test && python-any-r1_pkg_setup
 }
 
diff --git a/sys-libs/libomp/libomp-9999.ebuild b/sys-libs/libomp/libomp-9999.ebuild
index 6b0c0b5b8014..4d5905215164 100644
--- a/sys-libs/libomp/libomp-9999.ebuild
+++ b/sys-libs/libomp/libomp-9999.ebuild
@@ -8,7 +8,7 @@ EAPI=6
 CMAKE_MIN_VERSION=3.7.0-r1
 PYTHON_COMPAT=( python2_7 )
 
-inherit cmake-multilib git-r3 python-any-r1
+inherit cmake-multilib git-r3 linux-info python-any-r1
 
 DESCRIPTION="OpenMP runtime library for LLVM/clang compiler"
 HOMEPAGE="https://openmp.llvm.org"
@@ -24,8 +24,7 @@ LICENSE="|| ( UoI-NCSA MIT ) MIT LLVM-Grant"
 SLOT="0"
 KEYWORDS=""
 IUSE="hwloc ompt test"
-# Restrict tests to avoid hanging, https://bugs.gentoo.org/638410
-RESTRICT="test !test? ( test )"
+RESTRICT="!test? ( test )"
 
 RDEPEND="hwloc? ( sys-apps/hwloc:0=[${MULTILIB_USEDEP}] )"
 # tests:
@@ -43,11 +42,19 @@ DEPEND="${RDEPEND}
 # least intrusive of all
 CMAKE_BUILD_TYPE=RelWithDebInfo
 
+CONFIG_CHECK="~!SCHED_PDS"
+ERROR_SCHED_PDS="PDS scheduler is not supported as it does not implement sched_yield()"
+
 python_check_deps() {
 	has_version "dev-python/lit[${PYTHON_USEDEP}]"
 }
 
+pkg_pretend() {
+	linux-info_pkg_setup
+}
+
 pkg_setup() {
+	linux-info_pkg_setup
 	use test && python-any-r1_pkg_setup
 }
 
-- 
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