linux+lstopo: disable memory binding in the linux backend on Android

get_mempolicy() crashes on some Android (e.g. android10/aarch64/3.18)
and in some versions of the emulator in Android Studio.
It's used by lstopo for getting the current binding, but the Android
app doesn't need this anyway.

Disable the Linux membind hooks instead of just disabling get_*bind()
calls in lstopo.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc/topology-linux.c

@@ -2158,6 +2158,7 @@ hwloc_set_linuxfs_hooks(struct hwloc_binding_hooks *hooks,
   hooks->get_thisthread_last_cpu_location = hwloc_linux_get_thisthread_last_cpu_location;
   hooks->get_thisproc_last_cpu_location = hwloc_linux_get_thisproc_last_cpu_location;
   hooks->get_proc_last_cpu_location = hwloc_linux_get_proc_last_cpu_location;
+#ifndef ANDROID /* get_mempolicy crashes on some Android */
   hooks->set_thisthread_membind = hwloc_linux_set_thisthread_membind;
   hooks->get_thisthread_membind = hwloc_linux_get_thisthread_membind;
   hooks->get_area_membind = hwloc_linux_get_area_membind;
@@ -2170,6 +2171,7 @@ hwloc_set_linuxfs_hooks(struct hwloc_binding_hooks *hooks,
   support->membind->bind_membind = 1;
   support->membind->interleave_membind = 1;
   support->membind->migrate_membind = 1;
+#endif
   hooks->get_allowed_resources = hwloc_linux_get_allowed_resources_hook;
 
   /* The get_allowed_resources() hook also works in the !thissystem case

utils/lstopo/lstopo.c

@@ -1469,22 +1469,18 @@ main (int argc, char *argv[])
   }
 
   hwloc_bitmap_fill(loutput.cpubind_set);
-#ifndef ANDROID
   if (loutput.pid_number != -1 && loutput.pid_number != 0)
     hwloc_get_proc_cpubind(topology, loutput.pid, loutput.cpubind_set, 0);
   else
     /* get our binding even if --pid not given, it may be used by --restrict */
     hwloc_get_cpubind(topology, loutput.cpubind_set, 0);
-#endif
 
   hwloc_bitmap_fill(loutput.membind_set);
-#ifndef ANDROID
   if (loutput.pid_number != -1 && loutput.pid_number != 0)
     hwloc_get_proc_membind(topology, loutput.pid, loutput.membind_set, &policy, HWLOC_MEMBIND_BYNODESET);
   else
     /* get our binding even if --pid not given, it may be used by --restrict */
     hwloc_get_membind(topology, loutput.membind_set, &policy, HWLOC_MEMBIND_BYNODESET);
-#endif
 
   loutput.need_pci_domain = lstopo_check_pci_domains(topology);