c1a53b8056
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> |
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| .. | ||
| Makefile | ||
| rcu.h | ||
| srcu.c | ||
| tiny.c | ||
| tiny_plugin.h | ||
| torture.c | ||
| tree.c | ||
| tree.h | ||
| tree_plugin.h | ||
| tree_trace.c | ||
| update.c | ||