[PATCH] PPC64 iSeries fails to boot

[Stephen Rothwell]

Hi Andrew, Linus,

Jeremy Katz of Red Hat reported that his iSeries machine would not boot
with 2.6.7 based kernels.  It appears that with the inclusion of Paul
Mackerras' patch "Optimize exception/syscall entry/exit" a small previous
patch got reverted.  Here is that patch again.  The lack of this patch
does not stop all iSeries machines booting, but it does stop some.

Please apply.

Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>

--
Cheers,
Stephen Rothwell                    sfr at canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

diff -ruN 2.6.7-bk9/arch/ppc64/kernel/head.S 2.6.7-bk9.head/arch/ppc64/kernel/head.S
--- 2.6.7-bk9/arch/ppc64/kernel/head.S	2004-06-27 13:31:01.000000000 +1000
+++ 2.6.7-bk9.head/arch/ppc64/kernel/head.S	2004-06-27 20:22:13.000000000 +1000
@@ -631,6 +631,9 @@
 	.globl SystemReset_Iseries
 SystemReset_Iseries:
 	mfspr	r13,SPRG3		/* Get paca address */
+	mfmsr	r24
+	ori	r24,r24,MSR_RI
+	mtmsrd	r24			/* RI on */
 	lhz	r24,PACAPACAINDEX(r13)	/* Get processor # */
 	cmpwi	0,r24,0			/* Are we processor 0? */
 	beq	.__start_initialization_iSeries	/* Start up the first processor */

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