!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>
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