[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20210408103605.1676875-3-elver@google.com>
Date: Thu, 8 Apr 2021 12:35:57 +0200
From: Marco Elver <elver@...gle.com>
To: elver@...gle.com, peterz@...radead.org,
alexander.shishkin@...ux.intel.com, acme@...nel.org,
mingo@...hat.com, jolsa@...hat.com, mark.rutland@....com,
namhyung@...nel.org, tglx@...utronix.de
Cc: glider@...gle.com, viro@...iv.linux.org.uk, arnd@...db.de,
christian@...uner.io, dvyukov@...gle.com, jannh@...gle.com,
axboe@...nel.dk, mascasa@...gle.com, pcc@...gle.com,
irogers@...gle.com, oleg@...hat.com, kasan-dev@...glegroups.com,
linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, x86@...nel.org,
linux-kselftest@...r.kernel.org
Subject: [PATCH v4 02/10] 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>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Marco Elver <elver@...gle.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 e77294c7e654..a9a0a46909af 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3199,16 +3199,36 @@ 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,
--
2.31.0.208.g409f899ff0-goog
Powered by blists - more mailing lists