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Date: Wed, 5 Nov 2014 15:35:51 +0000 From: Harry van Haaren <harryhaaren@...il.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: Juerg Haefliger <juergh@...il.com>, Mike Galbraith <umgwanakikbuti@...il.com>, LKML <linux-kernel@...r.kernel.org>, linux-rt-users <linux-rt-users@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Carsten Emde <C.Emde@...dl.org>, John Kacur <jkacur@...hat.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Clark Williams <williams@...hat.com> Subject: Re: [ANNOUNCE] 3.14.23-rt20 On Wed, 5 Nov 2014 14:50:41 +0100 Juerg Haefliger <juergh@...il.com> wrote: > The cpufreq code does nested down_read_trylocks and only the first one succeeds: >drivers/cpufreq/cpufreq.c: >store > down_read_trylock(cpufreq_rwsem) <- succeeds > store_scaling_governor > cpufreq_get_policy > cpufreq_cpu_get > down_read_trylock(cpufreq_rwsem) <-- fails On a related note: I think this patch/issue may be the cause of the -rt CPU frequency scaling bug I reported a couple of months ago. http://comments.gmane.org/gmane.linux.rt.user/12472 I'm currently using the performance governor by default as a workaround; thanks to JackWinter for packaging in the ArchAudio repos. Cheers, -Harry -- http://www.openavproductions.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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