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OpenCloudOS-Kernel
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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull perf fixes from Ingo Molnar:
 "Misc fixes: a handful of AUX event handling related fixes, a Sparse
  fix and two ABI fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix missing static inline on perf_cgroup_switch()
  perf/core: Consistently fail fork on allocation failures
  perf/aux: Disallow aux_output for kernel events
  perf/core: Reattach a misplaced comment
  perf/aux: Fix the aux_output group inheritance fix
  perf/core: Disallow uncore-cgroup events
This commit is contained in:
Linus Torvalds 2019-11-16 15:56:01 -08:00
parent 8be636dd8a d00dbd2981
commit 5ffaf037e7
1 changed files with 19 additions and 4 deletions
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23
kernel/events/core.c
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@ -1031,7 +1031,7 @@ perf_cgroup_set_timestamp(struct task_struct *task,
{
}
void
static inline void
perf_cgroup_switch(struct task_struct *task, struct task_struct *next)
{
}
@ -10535,6 +10535,15 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
goto err_ns;
}
/*
* Disallow uncore-cgroup events, they don't make sense as the cgroup will
* be different on other CPUs in the uncore mask.
*/
if (pmu->task_ctx_nr == perf_invalid_context && cgroup_fd != -1) {
err = -EINVAL;
goto err_pmu;
}
if (event->attr.aux_output &&
!(pmu->capabilities & PERF_PMU_CAP_AUX_OUTPUT)) {
err = -EOPNOTSUPP;
@ -11323,8 +11332,11 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
int err;
/*
* Get the target context (task or percpu):
* Grouping is not supported for kernel events, neither is 'AUX',
* make sure the caller's intentions are adjusted.
*/
if (attr->aux_output)
return ERR_PTR(-EINVAL);
event = perf_event_alloc(attr, cpu, task, NULL, NULL,
overflow_handler, context, -1);
@ -11336,6 +11348,9 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
/* Mark owner so we could distinguish it from user events. */
event->owner = TASK_TOMBSTONE;
/*
* Get the target context (task or percpu):
*/
ctx = find_get_context(event->pmu, task, event);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
@ -11787,7 +11802,7 @@ inherit_event(struct perf_event *parent_event,
GFP_KERNEL);
if (!child_ctx->task_ctx_data) {
free_event(child_event);
return NULL;
return ERR_PTR(-ENOMEM);
}
}
@ -11890,7 +11905,7 @@ static int inherit_group(struct perf_event *parent_event,
if (IS_ERR(child_ctr))
return PTR_ERR(child_ctr);
if (sub->aux_event == parent_event &&
if (sub->aux_event == parent_event && child_ctr &&
!perf_get_aux_event(child_ctr, leader))
return -EINVAL;
}