linux-kernel - [ 003/180] powerpc/pmac: Fix SMP kernels on pre-core99 UP machines

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Date:	Tue, 02 Oct 2012 00:52:00 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Willy Tarreau <w@....eu>
Subject: [ 003/180] powerpc/pmac: Fix SMP kernels on pre-core99 UP machines

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Herrenschmidt <benh@...nel.crashing.org>

commit 78c5c68a4cf4329d17abfa469345ddf323d4fd62 upstream.

The code for "powersurge" SMP would kick in and cause a crash
at boot due to the lack of a NULL test.

Adam Conrad reports that the 3.2 kernel, with CONFIG_SMP=y, will not
boot on an OldWorld G3; we're unconditionally writing to psurge_start,
but this is only set on powersurge machines.

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
Reported-by: Adam Conrad <adconrad@...ntu.com>
Tested-by: Adam Conrad <adconrad@...ntu.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/powerpc/platforms/powermac/smp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index b40c22d..7f66d0c 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -402,7 +402,7 @@ static struct irqaction psurge_irqaction = {
 
 static void __init smp_psurge_setup_cpu(int cpu_nr)
 {
-	if (cpu_nr != 0)
+	if (cpu_nr != 0 || !psurge_start)
 		return;
 
 	/* reset the entry point so if we get another intr we won't
-- 
1.7.2.1.45.g54fbc



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