Messages in this thread | | | Subject | Re: [PATCH] powerpc/xmon: Fix data-breakpoint | From | Ravi Bangoria <> | Date | Tue, 14 Feb 2017 14:17:19 +0530 |
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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.bangoria@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); > > /*
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