import hwloc-2.2.0-2.el8

SOURCES/0001.patch

@@ -0,0 +1,74 @@
+From: Prarit Bhargava <prarit@redhat.com>
+
+Subject: linux: fix support for NUMA node0 being offline
+
+commit 0114c2b0b3e39265e0829eebfff87ac9f4412fe9
+Author: Brice Goglin <Brice.Goglin@inria.fr>
+Date:   Mon Apr 26 20:35:42 2021 +0200
+
+    linux: fix support for NUMA node0 being offline
+    
+    Just like we didn't support offline CPU#0 until commit
+    7bcc273efd50536961ba16d474efca4ae163229b, we need to
+    support node0 being offline as well.
+    It's not clear whether it's a new Linux feature or not,
+    this was reported on a POWER LPAR VM.
+    
+    The symptoms are different here because we got no NUMA
+    nodes at all, hence the core hwloc added a default
+    machine-wide node. But this node got marked disallowed
+    by Linux cgroups. Hence load() failed with
+     "Topology does not contain any NUMA node, aborting!"
+    
+    We opportunistically assume node0 is online to avoid
+    the overhead in the vast majority of cases. If node0
+    is missing, we parse "online" to find the first node.
+    
+    Thanks to Jirka Hladky for the report.
+    
+    Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
+
+Signed-off-by: Prarit Bhargava <prarit@redhat.com>
+
+diff -urNp hwloc-2.2.0.orig/hwloc/topology-linux.c hwloc-2.2.0/hwloc/topology-linux.c
+--- hwloc-2.2.0.orig/hwloc/topology-linux.c	2021-05-10 14:44:42.690559128 -0400
++++ hwloc-2.2.0/hwloc/topology-linux.c	2021-05-10 14:44:57.858982883 -0400
+@@ -5342,6 +5342,9 @@ static const char *find_sysfs_cpu_path(i
+ 
+ static const char *find_sysfs_node_path(int root_fd)
+ {
++  unsigned first;
++  int err;
++
+   if (!hwloc_access("/sys/bus/node/devices", R_OK|X_OK, root_fd)
+       && !hwloc_access("/sys/bus/node/devices/node0/cpumap", R_OK, root_fd))
+     return "/sys/bus/node/devices";
+@@ -5350,6 +5353,28 @@ static const char *find_sysfs_node_path(
+       && !hwloc_access("/sys/devices/system/node/node0/cpumap", R_OK, root_fd))
+     return "/sys/devices/system/node";
+ 
++  /* node0 might be offline, fallback to looking at the first online node.
++   * online contains comma-separated ranges, just read the first number.
++   */
++  hwloc_debug("Failed to find sysfs node files using node0, looking at online nodes...\n");
++  err = hwloc_read_path_as_uint("/sys/devices/system/node/online", &first, root_fd);
++  if (err) {
++    hwloc_debug("Failed to find read /sys/devices/system/node/online.\n");
++  } else {
++    char path[PATH_MAX];
++    hwloc_debug("Found node#%u as first online node\n", first);
++
++    snprintf(path, sizeof(path), "/sys/bus/node/devices/node%u/cpumap", first);
++    if (!hwloc_access("/sys/bus/node/devices", R_OK|X_OK, root_fd)
++        && !hwloc_access(path, R_OK, root_fd))
++      return "/sys/bus/node/devices";
++
++    snprintf(path, sizeof(path), "/sys/devices/system/node/node%u/cpumap", first);
++    if (!hwloc_access("/sys/devices/system/node", R_OK|X_OK, root_fd)
++        && !hwloc_access(path, R_OK, root_fd))
++      return "/sys/devices/system/node";
++  }
++
+   return NULL;
+ }
+ 

SPECS/hwloc.spec

@@ -1,10 +1,11 @@
 Summary:   Portable Hardware Locality - portable abstraction of hierarchical architectures
 Name:      hwloc
 Version:   2.2.0
-Release:   1%{?dist}
+Release:   2%{?dist}
 License:   BSD
 URL:       http://www.open-mpi.org/projects/hwloc/
 Source0:   http://www.open-mpi.org/software/hwloc/v2.0/downloads/%{name}-%{version}.tar.bz2
+Patch0:    0001.patch
 Requires:  %{name}-libs%{?_isa} = %{version}-%{release}
 
 BuildRequires: gcc
@@ -175,6 +176,9 @@ LD_LIBRARY_PATH=$PWD/hwloc/.libs make check
 %{_libdir}/%{name}/hwloc*
 
 %changelog
+* Mon May 17 2021 Prarit Bhargava <prarit@redhat.com> - 2.2.0-2
+- Add support for node 0 offline
+
 * Mon Oct 12 2020 Prarit Bhargava <prarit@redhat.com> - 2.2.0-1
 - Rebuild for 8.4.0