powerpc: Rework set_dabr so it can take a DABRX value as well

Rework set_dabr to take a DABRX value as well.

Both the pseries and PS3 hypervisors do some checks on the DABRX
values that are passed in the hcall.  This patch stops bogus values
from being passed to hypervisor.  Also, in the case where we are
clearing the breakpoint, where DABR and DABRX are zero, we modify the
DABRX value to make it valid so that the hcall won't fail.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 29be2712e560..a2dc75793bd5 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -131,7 +131,7 @@ static int do_signal(struct pt_regs *regs)
          * triggered inside the kernel.
          */
         if (current->thread.dabr)
-                set_dabr(current->thread.dabr);
+                set_dabr(current->thread.dabr, current->thread.dabrx);
 #endif
         /* Re-enable the breakpoints for the signal stack */
         thread_change_pc(current, regs);