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Date: Fri, 02 Jul 2010 10:03:41 +1000 From: Michael Neuling <mikey@...ling.org> To: Greg KH <gregkh@...e.de> cc: linux-kernel@...r.kernel.org, stable@...nel.org, stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Benjamin Herrenschmidt <benh@...nel.crashing.org> Subject: Re: [patch 054/149] powerpc/pseries: Only call start-cpu when a CPU is stopped This is not going to work without: f8b67691828321f5c85bb853283aa101ae673130 It'll get a build failure. You seemed to have pulled this one the 33 stable. Mikey In message <20100701173211.356448329@...rk.site> you wrote: > 2.6.32-stable review patch. If anyone has any objections, please let us know . > > ------------------ > > From: Michael Neuling <mikey@...ling.org> > > commit aef40e87d866355ffd279ab21021de733242d0d5 upstream. > > Currently we always call start-cpu irrespective of if the CPU is > stopped or not. Unfortunatley on POWER7, firmware seems to not like > start-cpu being called when a cpu already been started. This was not > the case on POWER6 and earlier. > > This patch checks to see if the CPU is stopped or not via an > query-cpu-stopped-state call, and only calls start-cpu on CPUs which > are stopped. > > This fixes a bug with kexec on POWER7 on PHYP where only the primary > thread would make it to the second kernel. > > Reported-by: Ankita Garg <ankita@...ux.vnet.ibm.com> > Signed-off-by: Michael Neuling <mikey@...ling.org> > Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> > > --- > arch/powerpc/platforms/pseries/smp.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > --- a/arch/powerpc/platforms/pseries/smp.c > +++ b/arch/powerpc/platforms/pseries/smp.c > @@ -81,6 +81,12 @@ static inline int __devinit smp_startup_ > > pcpu = get_hard_smp_processor_id(lcpu); > > + /* Check to see if the CPU out of FW already for kexec */ > + if (smp_query_cpu_stopped(pcpu) == QCSS_NOT_STOPPED){ > + cpu_set(lcpu, of_spin_map); > + return 1; > + } > + > /* Fixup atomic count: it exited inside IRQ handler. */ > task_thread_info(paca[lcpu].__current)->preempt_count = 0; > > > -- 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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