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Date: Sat, 9 Jan 2010 15:40:38 +0530 From: Ananth N Mavinakayanahalli <ananth@...ibm.com> To: suresh.b.siddha@...el.com, Linus Torvalds <torvalds@...ux-foundation.org> Cc: yinghai@...nel.org, Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>, stable@...nel.org Subject: [PATCH] Make Intel 8-way Xeons boot again On an 8-way system with Intel Xeon X7350 CPUs, booting 2.6.32 or newer kernels fails at: ... CPU0: Intel(R) Xeon(R) CPU X7350 @ 2.93GHz stepping 0b Booting Node 0, Processors #1 #2 #3 #4 #5 #6 #7 Ok. Brought up 8 CPUs Total of 8 processors activated (46906.05 BogoMIPS). Git bisect showed 2fbd07a5f as the offending commit. With the patch below, I am able to boot the latest Linus' git tree on the machine. If this patch is correct, it needs to get into the stable tree too. Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com> --- Index: linux-2.6/arch/x86/kernel/apic/probe_64.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic/probe_64.c 2010-01-09 14:54:29.000000000 +0530 +++ linux-2.6/arch/x86/kernel/apic/probe_64.c 2010-01-09 14:57:53.000000000 +0530 @@ -70,7 +70,7 @@ if (apic == &apic_flat) { switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_INTEL: - if (num_processors > 8) + if (num_processors >= 8) apic = &apic_physflat; break; case X86_VENDOR_AMD: -- 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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