Paul E. McKenney c1a53b8056 rcu: Don't disable CPU hotplug during OOM notifiers ... RCU's rcu_oom_notify() disables CPU hotplug in order to stabilize the list of online CPUs, which it traverses. However, this is completely pointless because smp_call_function_single() will quietly fail if invoked on an offline CPU. Because the count of requests is incremented in the rcu_oom_notify_cpu() function that is remotely invoked, everything works nicely even in the face of concurrent CPU-hotplug operations. Furthermore, in recent kernels, invoking get_online_cpus() from an OOM notifier can result in deadlock. This commit therefore removes the call to get_online_cpus() and put_online_cpus() from rcu_oom_notify(). Change-Id: Ib5cfc417a7481ae0ee9ae2ee82b88a73b2d12a89 Reported-by: Marcin Ślusarz <marcin.slusarz@gmail.com> Reported-by: David Rientjes <rientjes@google.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Tested-by: Marcin Ślusarz <marcin.slusarz@gmail.com> Git-commit: 9a54f98e341d09793247a6e598012edefb5ae7cb Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>		2016-01-06 23:11:06 -08:00
..
Makefile
rcu.h
srcu.c
tiny.c
tiny_plugin.h
torture.c
tree.c	rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads	2015-06-22 10:34:49 +05:30
tree.h	rcu: Make callers awaken grace-period kthread	2015-06-22 10:34:42 +05:30
tree_plugin.h	rcu: Don't disable CPU hotplug during OOM notifiers	2016-01-06 23:11:06 -08:00
tree_trace.c
update.c