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SubjectRe: [PATCH RESEND v3] perf/core: Fix installing cgroup event into cpu
Hi leilei.lin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.15 next-20180202]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/linxiulei-gmail-com/perf-core-Fix-installing-cgroup-event-into-cpu/20180203-133110
config: i386-randconfig-x071-201804 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

kernel/events/core.c: In function '__perf_install_in_context':
>> kernel/events/core.c:2332:10: error: implicit declaration of function 'perf_cgroup_from_task'; did you mean 'perf_cgroup_match'? [-Werror=implicit-function-declaration]
cgrp = perf_cgroup_from_task(current, ctx);
^~~~~~~~~~~~~~~~~~~~~
perf_cgroup_match
kernel/events/core.c:2332:8: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
cgrp = perf_cgroup_from_task(current, ctx);
^
>> kernel/events/core.c:2333:40: error: dereferencing pointer to incomplete type 'struct perf_cgroup'
reprogram = cgroup_is_descendant(cgrp->css.cgroup,
^~
>> kernel/events/core.c:2334:11: error: 'struct perf_event' has no member named 'cgrp'
event->cgrp->css.cgroup);
^~
cc1: some warnings being treated as errors

vim +2332 kernel/events/core.c

2284
2285 /*
2286 * Cross CPU call to install and enable a performance event
2287 *
2288 * Very similar to remote_function() + event_function() but cannot assume that
2289 * things like ctx->is_active and cpuctx->task_ctx are set.
2290 */
2291 static int __perf_install_in_context(void *info)
2292 {
2293 struct perf_event *event = info;
2294 struct perf_event_context *ctx = event->ctx;
2295 struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
2296 struct perf_event_context *task_ctx = cpuctx->task_ctx;
2297 struct perf_cgroup *cgrp;
2298 bool reprogram = true;
2299 int ret = 0;
2300
2301 raw_spin_lock(&cpuctx->ctx.lock);
2302 if (ctx->task) {
2303 raw_spin_lock(&ctx->lock);
2304 task_ctx = ctx;
2305
2306 reprogram = (ctx->task == current);
2307
2308 /*
2309 * If the task is running, it must be running on this CPU,
2310 * otherwise we cannot reprogram things.
2311 *
2312 * If its not running, we don't care, ctx->lock will
2313 * serialize against it becoming runnable.
2314 */
2315 if (task_curr(ctx->task) && !reprogram) {
2316 ret = -ESRCH;
2317 goto unlock;
2318 }
2319
2320 WARN_ON_ONCE(reprogram && cpuctx->task_ctx && cpuctx->task_ctx != ctx);
2321 } else if (task_ctx) {
2322 raw_spin_lock(&task_ctx->lock);
2323 }
2324
2325 if (is_cgroup_event(event)) {
2326 /*
2327 * Only care about cgroup events.
2328 *
2329 * If only the task belongs to cgroup of this event,
2330 * we will continue the installment
2331 */
> 2332 cgrp = perf_cgroup_from_task(current, ctx);
> 2333 reprogram = cgroup_is_descendant(cgrp->css.cgroup,
> 2334 event->cgrp->css.cgroup);
2335 }
2336
2337 if (reprogram) {
2338 ctx_sched_out(ctx, cpuctx, EVENT_TIME);
2339 add_event_to_ctx(event, ctx);
2340 ctx_resched(cpuctx, task_ctx, get_event_type(event));
2341 } else {
2342 add_event_to_ctx(event, ctx);
2343 }
2344
2345 unlock:
2346 perf_ctx_unlock(cpuctx, task_ctx);
2347
2348 return ret;
2349 }
2350

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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