diff options
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 083521327e64..719ba42ff5ee 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -61,13 +61,13 @@ static inline void check_for_tasks(int cpu) * cpu' with certain environment variables set. */ static int cpu_run_sbin_hotplug(unsigned int cpu, const char *action) { - char *argv[3], *envp[5], cpu_str[12], action_str[32]; + char *argv[3], *envp[6], cpu_str[12], action_str[32], devpath_str[40]; int i; sprintf(cpu_str, "CPU=%d", cpu); sprintf(action_str, "ACTION=%s", action); - /* FIXME: Add DEVPATH. --RR */ - + sprintf(devpath_str, "DEVPATH=devices/system/cpu/cpu%d", cpu); + i = 0; argv[i++] = hotplug_path; argv[i++] = "cpu"; @@ -79,6 +79,7 @@ static int cpu_run_sbin_hotplug(unsigned int cpu, const char *action) envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; envp[i++] = cpu_str; envp[i++] = action_str; + envp[i++] = devpath_str; envp[i] = NULL; return call_usermodehelper(argv[0], argv, envp, 0); @@ -123,6 +124,15 @@ int cpu_down(unsigned int cpu) goto out; } + err = notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE, + (void *)(long)cpu); + if (err == NOTIFY_BAD) { + printk("%s: attempt to take down CPU %u failed\n", + __FUNCTION__, cpu); + err = -EINVAL; + goto out; + } + /* Ensure that we are not runnable on dying cpu */ old_allowed = current->cpus_allowed; tmp = CPU_MASK_ALL; @@ -131,6 +141,11 @@ int cpu_down(unsigned int cpu) p = __stop_machine_run(take_cpu_down, NULL, cpu); if (IS_ERR(p)) { + /* CPU didn't die: tell everyone. Can't complain. */ + if (notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED, + (void *)(long)cpu) == NOTIFY_BAD) + BUG(); + err = PTR_ERR(p); goto out_allowed; } |