| User: | Jiri Slaby |
| Error type: | Double Lock |
| Error type description: | Some lock is locked twice unintentionally in a sequence |
| File location: | kernel/sched.c |
| Line in file: | 9319 |
| Project: | Linux Kernel |
| Project version: | 2.6.28 |
| Tools: |
Undetermined 1
|
| Entered: | 2012-02-27 21:22:42 UTC |
9289 return ERR_PTR(-ENOMEM); 9290 } 9291 9292 return &ca->css; 9293} 9294 9295/* destroy an existing cpu accounting group */ 9296static void 9297cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp) 9298{ 9299 struct cpuacct *ca = cgroup_ca(cgrp); 9300 9301 free_percpu(ca->cpuusage); 9302 kfree(ca); 9303} 9304 9305/* return total cpu usage (in nanoseconds) of a group */ 9306static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft) 9307{ 9308 struct cpuacct *ca = cgroup_ca(cgrp); 9309 u64 totalcpuusage = 0; 9310 int i; 9311 9312 for_each_possible_cpu(i) { 9313 u64 *cpuusage = percpu_ptr(ca->cpuusage, i); 9314 9315 /* 9316 * Take rq->lock to make 64-bit addition safe on 32-bit 9317 * platforms. 9318 */ 9319 spin_lock_irq(&cpu_rq(i)->lock); 9320 totalcpuusage += *cpuusage; 9321 spin_unlock_irq(&cpu_rq(i)->lock); 9322 } 9323 9324 return totalcpuusage; 9325} 9326 9327static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype, 9328 u64 reset) 9329{