sparc64: Reschedule KGDB capture to a software interrupt.
Otherwise it might interrupt switch_to() midstream and use
half-cooked register window state.
Reported-by: Chris Torek <chris.torek@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 80c788e..b57a594 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -679,28 +679,8 @@
#ifdef CONFIG_KGDB
.globl xcall_kgdb_capture
xcall_kgdb_capture:
-661: rdpr %pstate, %g2
- wrpr %g2, PSTATE_IG | PSTATE_AG, %pstate
- .section .sun4v_2insn_patch, "ax"
- .word 661b
- nop
- nop
- .previous
-
- rdpr %pil, %g2
- wrpr %g0, PIL_NORMAL_MAX, %pil
- sethi %hi(109f), %g7
- ba,pt %xcc, etrap_irq
-109: or %g7, %lo(109b), %g7
-#ifdef CONFIG_TRACE_IRQFLAGS
- call trace_hardirqs_off
- nop
-#endif
- call smp_kgdb_capture_client
- add %sp, PTREGS_OFF, %o0
- /* Has to be a non-v9 branch due to the large distance. */
- ba rtrap_xcall
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
+ wr %g0, (1 << PIL_KGDB_CAPTURE), %set_softint
+ retry
#endif
#endif /* CONFIG_SMP */