[PATCH] powerpc: Fix 460EX/460GT machine check handling

Benjamin Herrenschmidt benh at kernel.crashing.org
Wed Nov 12 13:02:43 EST 2008


Those cores use the 440A type machine check (ie, they have
MCSRR0/MCSRR1). They thus need to call the appropriate fixup
function to hook the right variant of the exception.

Without this, all machine checks become fatal due to loss
of context when entering the exception handler.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---

 arch/powerpc/kernel/cpu_setup_44x.S |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- linux-work.orig/arch/powerpc/kernel/cpu_setup_44x.S	2008-11-12 12:51:24.000000000 +1100
+++ linux-work/arch/powerpc/kernel/cpu_setup_44x.S	2008-11-12 13:01:03.000000000 +1100
@@ -34,7 +34,12 @@ _GLOBAL(__setup_cpu_440grx)
 	blr
 _GLOBAL(__setup_cpu_460ex)
 _GLOBAL(__setup_cpu_460gt)
-	b	__init_fpu_44x
+	mflr	r4
+	bl	__init_fpu_44x
+	bl	__fixup_440A_mcheck
+	mtlr	r4
+	blr
+
 _GLOBAL(__setup_cpu_440gx)
 _GLOBAL(__setup_cpu_440spe)
 	b	__fixup_440A_mcheck



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