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Date: Wed, 10 Oct 2007 05:08:44 -0500 (CDT)
From: Milton Miller <miltonm@....com>
To: Olof Johansson <olof@...om.net>, Paul Mackerras <paulus@...ba.org>,
Greg Kroah-Hartman <gregkh@...e.de>
Cc: <linuxppc-dev@...abs.org>, <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2] powerpc: don't enable cpu hotplug on mpic-based pseries
Don't allow cpu hotplug on pSeries systems lacking XICS interrupt controller,
since current code is hardcoded to call xics routines.
Signed-off-by: Milton Miller <miltonm@....com>
--
Olof's patch searched the device-tree again, looking for an mpic. This
code instead checks that we found an xics the first time by checking the
init function.
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 9711eb0..20f010a 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -262,6 +262,12 @@ static int __init pseries_cpu_hotplug_init(void)
return 0;
}
+ if (ppc_md.init_IRQ != xics_init_IRQ) {
+ printk(KERN_INFO "pSeries CPU Hotplug only supported on xics "
+ "interrupt controllers - disabling");
+ return 0;
+ }
+
ppc_md.cpu_die = pseries_mach_cpu_die;
smp_ops->cpu_disable = pseries_cpu_disable;
smp_ops->cpu_die = pseries_cpu_die;
-
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