sparc64: Prevent stack backtrace false positives on trap frames.
When we fully commit to returning back to kernel mode from
a trap, zero out the regs->magic value to prevent false
positives during stack backtraces.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index 3afacbb..c6fc695 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -363,6 +363,7 @@
brz,pn %g1, kern_rtt_fill
nop
kern_rtt_restore:
+ stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
restore
retry