Hi Michael,
Can you please pull this patch.
Thanks,
Ravi
On Tuesday 22 November 2016 02:55 PM, Ravi Bangoria wrote:
> Xmon data-breakpoint feature is broken.
>
> Whenever there is a watchpoint match occurs, hw_breakpoint_handler will
> be called by do_break via notifier chains mechanism. If watchpoint is
> registered by xmon, hw_breakpoint_handler won't find any associated
> perf_event and returns immediately with NOTIFY_STOP. Similarly, do_break
> also returns without notifying to xmon.
>
> Solve this by returning NOTIFY_DONE when hw_breakpoint_handler does not
> find any perf_event associated with matched watchpoint.
>
> Signed-off-by: Ravi Bangoria <ravi.bango...@linux.vnet.ibm.com>
> ---
> arch/powerpc/kernel/hw_breakpoint.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/hw_breakpoint.c
> b/arch/powerpc/kernel/hw_breakpoint.c
> index 03d089b..469d86d 100644
> --- a/arch/powerpc/kernel/hw_breakpoint.c
> +++ b/arch/powerpc/kernel/hw_breakpoint.c
> @@ -228,8 +228,10 @@ int hw_breakpoint_handler(struct die_args *args)
> rcu_read_lock();
>
> bp = __this_cpu_read(bp_per_reg);
> - if (!bp)
> + if (!bp) {
> + rc = NOTIFY_DONE;
> goto out;
> + }
> info = counter_arch_bp(bp);
>
> /*
