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Message-ID: <161858531152.29796.6913083188712976214.tip-bot2@tip-bot2>
Date: Fri, 16 Apr 2021 15:01:51 -0000
From: "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Dmitry Vyukov <dvyukov@...gle.com>, Marco Elver <elver@...gle.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf: Apply PERF_EVENT_IOC_MODIFY_ATTRIBUTES to children
The following commit has been merged into the perf/core branch of tip:
Commit-ID: 47f661eca0700928012e11c57ea0328f5ccfc3b9
Gitweb: https://git.kernel.org/tip/47f661eca0700928012e11c57ea0328f5ccfc3b9
Author: Marco Elver <elver@...gle.com>
AuthorDate: Thu, 08 Apr 2021 12:35:57 +02:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 16 Apr 2021 16:32:40 +02:00
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@...gle.com>
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
Link: https://lkml.kernel.org/r/20210408103605.1676875-3-elver@google.com
---
kernel/events/core.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 318ff7b..10ed2cd 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3200,16 +3200,36 @@ static int perf_event_modify_breakpoint(struct perf_event *bp,
static int perf_event_modify_attr(struct perf_event *event,
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)
return -EINVAL;
switch (event->attr.type) {
case PERF_TYPE_BREAKPOINT:
- return perf_event_modify_breakpoint(event, attr);
+ func = perf_event_modify_breakpoint;
+ break;
default:
/* Place holder for future additions. */
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,
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