[SPARC64]: Sanitize %pstate writes for sun4v.
If we're just switching between different alternate global
sets, nop it out on sun4v. Also, get rid of all of the
alternate global save/restore in the OBP CIF trampoline code.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
index 3b45db9..96e6316 100644
--- a/arch/sparc64/kernel/tsb.S
+++ b/arch/sparc64/kernel/tsb.S
@@ -82,9 +82,17 @@
.globl tsb_do_fault
tsb_do_fault:
cmp %g3, FAULT_CODE_DTLB
- rdpr %pstate, %g5
+
+661: rdpr %pstate, %g5
+ wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
+ .section .gl_2insn_patch, "ax"
+ .word 661b
+ nop
+ nop
+ .previous
+
bne,pn %xcc, tsb_do_itlb_fault
- wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
+ nop
tsb_do_dtlb_fault:
rdpr %tl, %g4