diff options
| author | Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> | 2016-11-22 12:25:59 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-06-05 23:13:49 +0300 |
| commit | 249207e4f46d4a491228e8655a3433946c54ba2a (patch) | |
| tree | 1df6dd438582ccc5cce6434852d35349ad5eb10b /arch | |
| parent | be1fba0a20485d78d98a2642f2cf658e09502736 (diff) | |
| download | linux-249207e4f46d4a491228e8655a3433946c54ba2a.tar.xz | |
powerpc/xmon: Fix data-breakpoint
commit c21a493a2b44650707d06741601894329486f2ad upstream.
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.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/hw_breakpoint.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index 2bc0584be81c..844c0e66dd30 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -226,8 +226,10 @@ int __kprobes hw_breakpoint_handler(struct die_args *args) rcu_read_lock(); bp = __get_cpu_var(bp_per_reg); - if (!bp) + if (!bp) { + rc = NOTIFY_DONE; goto out; + } info = counter_arch_bp(bp); /* |