Message ID | 20230612093541.025480679@infradead.org |
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State | New |
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Series |
Scope-based Resource Management
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Commit Message
Peter Zijlstra
June 12, 2023, 9:08 a.m. UTC
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/events/core.c | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)
--- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -11504,10 +11504,10 @@ static int perf_try_init_event(struct pm static struct pmu *perf_init_event(struct perf_event *event) { bool extended_type = false; - int idx, type, ret; struct pmu *pmu; + int type, ret; - idx = srcu_read_lock(&pmus_srcu); + guard(srcu)(&pmus_srcu); /* * Save original type before calling pmu->event_init() since certain @@ -11520,7 +11520,7 @@ static struct pmu *perf_init_event(struc pmu = event->parent->pmu; ret = perf_try_init_event(pmu, event); if (!ret) - goto unlock; + return pmu; } /* @@ -11539,13 +11539,12 @@ static struct pmu *perf_init_event(struc } again: - rcu_read_lock(); - pmu = idr_find(&pmu_idr, type); - rcu_read_unlock(); + scoped_guard (rcu) + pmu = idr_find(&pmu_idr, type); if (pmu) { if (event->attr.type != type && type != PERF_TYPE_RAW && !(pmu->capabilities & PERF_PMU_CAP_EXTENDED_HW_TYPE)) - goto fail; + return ERR_PTR(-ENOENT); ret = perf_try_init_event(pmu, event); if (ret == -ENOENT && event->attr.type != type && !extended_type) { @@ -11554,27 +11553,21 @@ static struct pmu *perf_init_event(struc } if (ret) - pmu = ERR_PTR(ret); + return ERR_PTR(ret); - goto unlock; + return pmu; } list_for_each_entry_rcu(pmu, &pmus, entry, lockdep_is_held(&pmus_srcu)) { ret = perf_try_init_event(pmu, event); if (!ret) - goto unlock; + return pmu; - if (ret != -ENOENT) { - pmu = ERR_PTR(ret); - goto unlock; - } + if (ret != -ENOENT) + return ERR_PTR(ret); } -fail: - pmu = ERR_PTR(-ENOENT); -unlock: - srcu_read_unlock(&pmus_srcu, idx); - return pmu; + return ERR_PTR(-ENOENT); } static void attach_sb_event(struct perf_event *event)