[SPARC64]: Don't clobber alt-global %g4 on window fixups.
If we are returning back to kernel mode, %g4 could be live
(for example, in the case where we window spill in the etrap
code). So do not change it's value if going back to kernel.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S
index ade991b..320a762 100644
--- a/arch/sparc64/kernel/winfixup.S
+++ b/arch/sparc64/kernel/winfixup.S
@@ -160,7 +160,7 @@
andcc %g1, TSTATE_PRIV, %g0
saved
and %g1, TSTATE_CWP, %g1
- be,pn %xcc, window_scheisse_from_user_common
+ be,a,pn %xcc, window_scheisse_from_user_common
mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4
retry