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Groups > linux.kernel > #1640789
| From | Thomas Gleixner <tglx@linutronix.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest |
| Date | 2017-05-13 00:20 +0200 |
| Message-ID | <tGr4K-2RP-11@gated-at.bofh.it> (permalink) |
| References | <tGmy5-7Uc-3@gated-at.bofh.it> <tGmy5-7Uc-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 12 May 2017, Steven Rostedt wrote:
> void get_online_cpus(void)
> {
> +#ifdef CONFIG_LOCKDEP
> + if (current->goc_depth++)
> + return;
This must be unconditional and not depend on lockdep. The percpu rwsem is
going to deadlock silently otherwise when a writer is waiting ....
Thanks,
tglx
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[RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest Steven Rostedt <rostedt@goodmis.org> - 2017-05-12 19:30 +0200
Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-05-12 20:40 +0200
Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest Steven Rostedt <rostedt@goodmis.org> - 2017-05-12 20:50 +0200
Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-05-12 21:00 +0200
Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest Thomas Gleixner <tglx@linutronix.de> - 2017-05-13 00:20 +0200
Re: [RFC][PATCH 2/5] cpu-hotplug: Allow get_online_cpus() to nest Steven Rostedt <rostedt@goodmis.org> - 2017-05-13 02:30 +0200
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