[IA64] fix(?) unwind data for ia64_monarch_init_handler

Roland> I can see the ERROR: comes from unwcheck.pl but I have no
Roland> idea what it is checking (something to do with unwind info?)
Roland> let alone how to fix the problem.

Roland> Is this benign or is there something to be fixed?

David> Both: it needs to be fixed, but it's (mostly) benign since the only
David> time we're executing that code is when the unwinder can't run anyhow,
David> since we're in the middle of delivering an MCA.  That may (and
David> probably will) change in the future, so it's something that should be
David> fixed.

David> I was hoping someone who knows and could test the MCA code better
David> would fix it but that hasn't happened yet, so it's time for plan B.

David> Tony, below is a patch that fixes the unwind info enough that the
David> warning/error goes away.  The unwind-info may not be 100% correct
David> though.  Someone who can test/exercise this code may want to check on
David> that.
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/mca_asm.S

@@ -868,7 +868,7 @@ end_os_mca_restore:
 
 
 GLOBAL_ENTRY(ia64_monarch_init_handler)
-
+	.prologue
 	// stash the information the SAL passed to os
 	SAL_TO_OS_MCA_HANDOFF_STATE_SAVE(r2)
 	;;
@@ -907,6 +907,7 @@ IVirtual_Switch:
 	adds out0=16,sp				// out0 = pointer to pt_regs
 	;;
 	DO_SAVE_SWITCH_STACK
+	.body
 	adds out1=16,sp				// out0 = pointer to switch_stack
 
 	br.call.sptk.many rp=ia64_init_handler