linux-kernel - Re: [linux-usb-devel] [4/4] 2.6.23-rc3: known regressions

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Message-Id: <1187676254.2676.6.camel@laptopd505.fenrus.org>
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);


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