• Ravi Bangoria's avatar
    powerpc/xmon: Fix data-breakpoint · 9aabd8db
    Ravi Bangoria authored
    [ Upstream commit c21a493a ]
    
    Currently 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, rather than
    NOTIFY_STOP, which tells the core code to continue calling the other
    breakpoint handlers including the xmon one.
    
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
    9aabd8db
hw_breakpoint.c 9.37 KB