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perf: Apply PERF_EVENT_IOC_MODIFY_ATTRIBUTES to children 

As with other ioctls (such as PERF_EVENT_IOC_{ENABLE,DISABLE}), fix up
handling of PERF_EVENT_IOC_MODIFY_ATTRIBUTES to also apply to children.

Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://lkml.kernel.org/r/20210408103605.1676875-3-elver@google.com
This commit is contained in:
Marco Elver 2021-04-08 12:35:57 +02:00 committed by Peter Zijlstra
parent ef54c1a476
commit 47f661eca0
1 changed files with 21 additions and 1 deletions
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22
kernel/events/core.c
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@ -3200,16 +3200,36 @@ static int perf_event_modify_breakpoint(struct perf_event *bp,
static int perf_event_modify_attr(struct perf_event *event, static int perf_event_modify_attr(struct perf_event *event,
struct perf_event_attr *attr) struct perf_event_attr *attr)
{ {
int (*func)(struct perf_event *, struct perf_event_attr *);
struct perf_event *child;
int err;
if (event->attr.type != attr->type) if (event->attr.type != attr->type)
return -EINVAL; return -EINVAL;
switch (event->attr.type) { switch (event->attr.type) {
case PERF_TYPE_BREAKPOINT: case PERF_TYPE_BREAKPOINT:
return perf_event_modify_breakpoint(event, attr); func = perf_event_modify_breakpoint;
break;
default: default:
/* Place holder for future additions. */ /* Place holder for future additions. */
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }
WARN_ON_ONCE(event->ctx->parent_ctx);
mutex_lock(&event->child_mutex);
err = func(event, attr);
if (err)
goto out;
list_for_each_entry(child, &event->child_list, child_list) {
err = func(child, attr);
if (err)
goto out;
}
out:
mutex_unlock(&event->child_mutex);
return err;
} }
static void ctx_sched_out(struct perf_event_context *ctx, static void ctx_sched_out(struct perf_event_context *ctx,