powerpc: Fix 460EX/460GT machine check handling

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 <[email protected]>

---

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

arch/powerpc/kernel/cpu_setup_44x.S +6 -1

@@ -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

Quoted 4 lines · On Wed, 12 Nov 2008 13:02:43 +1100 Benjamin Herrenschmidt…

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.

Quoted 2 lines

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

Looks fine to me. However, what machine checks were you getting that caused you to see this that aren't fatal anyway?