!1186 Fix NULL pointer and Keep PERF_PMU_CAP_EXCLUSIVE

Merge Pull Request from: @ci-robot 
 
PR sync from: Junhao He <hejunhao3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/SFPID77Q7WRTZVPTFE5WSEDPJADFTQAY/ 
1) Fix NULL pointer for hisi_ptt
2) Keep to advertise PERF_PMU_CAP_EXCLUSIVE. Such ptt pmus can
   only have one event scheduled at a time.

Junhao He (2):
  hwtracing: hisi_ptt: Add dummy callback pmu::read()
  hwtracing: hisi_ptt: Keep to advertise PERF_PMU_CAP_EXCLUSIVE


-- 
2.33.0
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1186

 

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>