Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261532AbVAXRmz (ORCPT ); Mon, 24 Jan 2005 12:42:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261534AbVAXRmz (ORCPT ); Mon, 24 Jan 2005 12:42:55 -0500 Received: from aun.it.uu.se ([130.238.12.36]:28826 "EHLO aun.it.uu.se") by vger.kernel.org with ESMTP id S261532AbVAXRmu (ORCPT ); Mon, 24 Jan 2005 12:42:50 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16885.13185.849070.479328@alkaid.it.uu.se> Date: Mon, 24 Jan 2005 18:42:25 +0100 From: Mikael Pettersson To: Benjamin Herrenschmidt Cc: Mikael Pettersson , linuxppc-dev list , Paul Mackerras , Linux Kernel list Subject: Re: BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs In-Reply-To: <1106529935.5587.9.camel@gaston> References: <200501221723.j0MHN6eD000684@harpo.it.uu.se> <1106441036.5387.41.camel@gaston> <1106529935.5587.9.camel@gaston> X-Mailer: VM 7.17 under Emacs 20.7.1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2719 Lines: 80 Benjamin Herrenschmidt writes: > On Sun, 2005-01-23 at 11:43 +1100, Benjamin Herrenschmidt wrote: > > > I know about this problem, I'm working on a proper fix. Thanks for your > > report. > > Can you send me the PVR value for both of these CPUs > (cat /proc/cpuinfo) ? I can't find right now why they would lock up > unless the default idle loop is _not_ run properly, that is for some > reason, NAP or DOZE mode end up not beeing enabled. Can you send me > your .config as well ? === cpuinfo.emac === processor : 0 cpu : 7447/7457, altivec supported clock : 1249MHz revision : 1.1 (pvr 8002 0101) bogomips : 830.66 machine : PowerMac6,4 motherboard : PowerMac6,4 MacRISC3 Power Macintosh detected as : 287 (Unknown Intrepid-based) pmac flags : 00000000 L2 cache : 512K unified memory : 256MB pmac-generation : NewWorld === cpuinfo.beige-g3 === processor : 0 cpu : 7455, altivec supported (a Sonnet G4 upgrade processor) clock : 66MHz <-- bogus, is 1.0GHz in reality revision : 2.1 (pvr 8001 0201) bogomips : 999.42 machine : Power Macintosh motherboard : AAPL,Gossamer MacRISC detected as : 48 (PowerMac G3 (Gossamer)) pmac flags : 00000000 memory : 768MB pmac-generation : OldWorld The .config files are a bit big, I'm sending them off-list. > Finally, try that patch and tell me if it makes a difference. It makes > sure we re-enable interrupts in cpu_idle, and thus should only be a > workaround. I found _one_ actual code path where we fail to re-enable > them, and this is when neither DOZE nor NAP mode is enabled, which > should not happen on any G3 (they should all support DOZE mode), and > might happe non some G4s if the chipset doesn't support NAP or > powersave_nap is set to 0 in proc, but that shouldn't be the case of an > eMac neither... > > --- linux-work.orig/arch/ppc/kernel/idle.c 2005-01-24 11:42:35.000000000 +1100 > +++ linux-work/arch/ppc/kernel/idle.c 2005-01-24 12:19:41.114353760 +1100 > @@ -39,17 +39,15 @@ > powersave = ppc_md.power_save; > > if (!need_resched()) { > + local_irq_enable(); > if (powersave != NULL) > powersave(); > else { > #ifdef CONFIG_SMP > set_thread_flag(TIF_POLLING_NRFLAG); > - local_irq_enable(); > while (!need_resched()) > barrier(); > clear_thread_flag(TIF_POLLING_NRFLAG); > -#else > - local_irq_enable(); > #endif > } > } Yes, this patch made the eMac boot Ok -- I can't test the Beige G3 until Friday. /Mikael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/