[PATCH 14/15] powerpc/watchpoint/xmon: Don't allow breakpoint overwriting

[Ravi Bangoria]

Xmon allows overwriting breakpoints because it's supported by only
one dawr. But with multiple dawrs, overwriting becomes ambiguous
or unnecessary complicated. So let's not allow it.

Signed-off-by: Ravi Bangoria <ravi.bango...@linux.ibm.com>
---
 arch/powerpc/xmon/xmon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 0ca0d29f99c6..ac18fe3e4295 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -1381,6 +1381,10 @@ bpt_cmds(void)
                        printf("Hardware data breakpoint not supported on this 
cpu\n");
                        break;
                }
+               if (dabr.enabled) {
+                       printf("Couldn't find free breakpoint register\n");
+                       break;
+               }
                mode = 7;
                cmd = inchar();
                if (cmd == 'r')
-- 
2.21.1