linux-kernel - [PATCH] x86: mpparse: fix mp_bus_not

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Date:	Tue, 18 Oct 2011 08:47:47 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dan McGrath <troubledaemon@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, stable@...nel.org#2.6.26+,
	Jonathan Nieder <jrnieder@...il.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>
Subject: [PATCH] x86: mpparse: fix mp_bus_not_pci handling

Dan bisected a Dell PowerEdge 4200 boot regression to commit f8924e770.
Prior to that commit, 32-bit kernels set mp_bus_not_pci for all buses
except PCI.  Afterwards, we set mp_bus_not_pci only for ISA.  But ISA is
not the only non-PCI bus, so it's better to always set mp_bus_not_pci
and clear it only for PCI.

The workaround was to boot with "noapic".  Dan verified that with this
patch, his system boots without "noapic".

Reference: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586494
Reported-and-tested-by: Dan McGrath <troubledaemon@...il.com>
Cc: Alexey Starikovskiy <astarikovskiy@...e.de>
Cc: stable@...nel.org # 2.6.26+
Reviewed-by: Jonathan Nieder <jrnieder@...il.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/x86/kernel/mpparse.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 9103b89..0741b062 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -95,8 +95,8 @@ static void __init MP_bus_info(struct mpc_bus *m)
 	}
 #endif
 
+	set_bit(m->busid, mp_bus_not_pci);
 	if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
-		set_bit(m->busid, mp_bus_not_pci);
 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
 		mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
 #endif

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