From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Cook Subject: Re: Tracers+cyclictest causing kernel oops Date: Mon, 27 May 2013 22:23:53 +0100 Message-ID: References: <20130503160546.GF8230@linutronix.de> <519B57A7.1010901@linutronix.de> <20130527080248.GE11166@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Sebastian Andrzej Siewior , linux-rt-users To: =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= Return-path: Received: from mail-vb0-f51.google.com ([209.85.212.51]:38465 "EHLO mail-vb0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751245Ab3E0VXy convert rfc822-to-8bit (ORCPT ); Mon, 27 May 2013 17:23:54 -0400 Received: by mail-vb0-f51.google.com with SMTP id x16so4976343vbf.10 for ; Mon, 27 May 2013 14:23:53 -0700 (PDT) In-Reply-To: <20130527080248.GE11166@pengutronix.de> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Mon, May 27, 2013 at 9:02 AM, Uwe Kleine-K=C3=B6nig wrote: [snip] > What are you using fiqs for? AFAIK they are not well supported in > mainline Linux even. You're well on the way to plumbing the depths of my ignorance. This is just me applying the RT patches to the raspberrypi linux tree. The nearest I can figure out an answer to your question is this, in arch/arm/kernel/fiqasm.S, in __set_fiq_regs: @@@@@@@@@@@@@@@ hack: enable the fiq here to keep usb driver happy and r1, #~PSR_F_BIT @@@@@@@@@@@@@@@ endhack: (need to find better place for this to happen) It uses the dwc_otg driver, but reports have it that the match of hardware to driver is not wonderful. Regards, Tom -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html