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Date: Mon, 20 Aug 2007 23:04:14 -0700 From: Arjan van de Ven <arjan@...radead.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: David Brownell <david-b@...bell.net>, Michal Piotrowski <michal.k.k.piotrowski@...il.com>, linux-usb-devel@...ts.sourceforge.net, Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>, "Stuart_Hayes@...l.com" <Stuart_Hayes@...l.com>, Andrew Morton <akpm@...ux-foundation.org>, Daniel Exner <dex@...gonslave.de> Subject: Re: [linux-usb-devel] [4/4] 2.6.23-rc3: known regressions On Mon, 2007-08-20 at 22:51 -0700, Arjan van de Ven wrote: > and the C-state code will honor it. CPUFREQ doesn't honor it yet but > that's easy to add.. untested patch to add this to cpufreq; this is probably a good idea in general even if using the latency framework doesn't end up being used for fixing this regression... --- linux-2.6.23-rc2/drivers/cpufreq/cpufreq.c.org 2007-08-20 22:58:32.000000000 -0700 +++ linux-2.6.23-rc2/drivers/cpufreq/cpufreq.c 2007-08-20 23:02:21.000000000 -0700 @@ -1604,6 +1604,12 @@ static int __cpufreq_set_policy(struct c if (ret) goto error_out; + + if (system_latency_constraint() < policy->cpuinfo.transition_latency) { + ret = -EINVAL; + goto error_out; + } + /* notification of the new policy */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_NOTIFY, policy); - 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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