linux-kernel - Re: powerpc/xmon: Fix data-breakpoint

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Date:   Thu, 16 Feb 2017 16:59:45 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     peterz@...radead.org, linux-kernel@...r.kernel.org,
        npiggin@...il.com,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        paulus@...ba.org, naveen.n.rao@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: powerpc/xmon: Fix data-breakpoint

On Tue, 2016-11-22 at 09:25:59 UTC, 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@...ux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c21a493a2b44650707d06741601894

cheers