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| author |   Anju T Sudhakar <anju@linux.vnet.ibm.com> | 2017-12-05 11:00:38 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-12-13 20:36:53 +1100 |
| commit | ad2b6e01024ef23bddc3ce0bcb115ecd8c520b7e (patch) | |
| tree | 56a6e27a464240df94eb682159d88f5756019a02 /scripts/gdb/linux/tasks.py | |
| parent | powerpc/perf: Dereference BHRB entries safely (diff) | |
| download | wireguard-linux-ad2b6e01024ef23bddc3ce0bcb115ecd8c520b7e.tar.xz wireguard-linux-ad2b6e01024ef23bddc3ce0bcb115ecd8c520b7e.zip | |
powerpc/perf/imc: Fix nest-imc cpuhotplug callback failure
Oops is observed during boot:
Faulting instruction address: 0xc000000000248340
cpu 0x0: Vector: 380 (Data Access Out of Range) at [c000000ff66fb850]
pc: c000000000248340: event_function_call+0x50/0x1f0
lr: c00000000024878c: perf_remove_from_context+0x3c/0x100
sp: c000000ff66fbad0
msr: 9000000000009033
dar: 7d20e2a6f92d03c0
pid = 14, comm = cpuhp/0
While registering the cpuhotplug callbacks for nest-imc, if we fail in
the cpuhotplug online path for any random node in a multi node
system (because the opal call to stop nest-imc counters fails for that
node), ppc_nest_imc_cpu_offline() will get invoked for other nodes who
successfully returned from cpuhotplug online path.
This call trace is generated since in the ppc_nest_imc_cpu_offline()
path we are trying to migrate the event context, when nest-imc
counters are not even initialized.
Patch to add a check to ensure that nest-imc is registered before
migrating the event context.
Fixes: 885dcd709ba9 ("powerpc/perf: Add nest IMC PMU support")
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'scripts/gdb/linux/tasks.py')
0 files changed, 0 insertions, 0 deletions