diff options
Diffstat (limited to 'kernel/events')
| -rw-r--r--[-rwxr-xr-x] | kernel/events/core.c | 39 |
1 files changed, 19 insertions, 20 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 0a8264878..2d1b8fb46 100755..100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7055,28 +7055,27 @@ SYSCALL_DEFINE5(perf_event_open, if (group_leader->group_leader != group_leader) goto err_context; /* - * Do not allow to attach to a group in a different - * task or CPU context: + * Make sure we're both events for the same CPU; + * grouping events for different CPUs is broken; since + * you can never concurrently schedule them anyhow. */ - if (move_group) { - /* - * Make sure we're both on the same task, or both - * per-cpu events. - */ - if (group_leader->ctx->task != ctx->task) - goto err_context; + if (group_leader->cpu != event->cpu) + goto err_context; - /* - * Make sure we're both events for the same CPU; - * grouping events for different CPUs is broken; since - * you can never concurrently schedule them anyhow. - */ - if (group_leader->cpu != event->cpu) - goto err_context; - } else { - if (group_leader->ctx != ctx) - goto err_context; - } + /* + * Make sure we're both on the same task, or both + * per-CPU events. + */ + if (group_leader->ctx->task != ctx->task) + goto err_context; + + /* + * Do not allow to attach to a group in a different task + * or CPU context. If we're moving SW events, we'll fix + * this up later, so allow that. + */ + if (!move_group && group_leader->ctx != ctx) + goto err_context; /* * Only a group leader can be exclusive or pinned |