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perf/core: Introduce perf_free_addr_filters()

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Replace _free_event()'s use of perf_addr_filters_splice()s use with an
explicit perf_free_addr_filters() with the explicit propery that it is
able to be called a second time without ill effect.

Most notable, referencing event->pmu must be avoided when there are no
filters left (from eg a previous call).

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lore.kernel.org/r/20241104135518.868460518@infradead.org
This commit is contained in:
Peter Zijlstra 2024-11-04 14:39:21 +01:00 committed by Ingo Molnar
parent b2996f5655
commit adc38b4ca1
1 changed files with 13 additions and 3 deletions
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16
kernel/events/core.c
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@ -5339,8 +5339,7 @@ static bool exclusive_event_installable(struct perf_event *event,
return true;
}
static void perf_addr_filters_splice(struct perf_event *event,
struct list_head *head);
static void perf_free_addr_filters(struct perf_event *event);
static void perf_pending_task_sync(struct perf_event *event)
{
@ -5439,7 +5438,7 @@ static void _free_event(struct perf_event *event)
}
perf_event_free_bpf_prog(event);
perf_addr_filters_splice(event, NULL);
perf_free_addr_filters(event);
__free_event(event);
}
@ -11004,6 +11003,17 @@ static void perf_addr_filters_splice(struct perf_event *event,
free_filters_list(&list);
}
static void perf_free_addr_filters(struct perf_event *event)
{
/*
* Used during free paths, there is no concurrency.
*/
if (list_empty(&event->addr_filters.list))
return;
perf_addr_filters_splice(event, NULL);
}
/*
* Scan through mm's vmas and see if one of them matches the
* @filter; if so, adjust filter's address range.