diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kexec.c | 6 | ||||
| -rw-r--r-- | kernel/pid_namespace.c | 33 | ||||
| -rw-r--r-- | kernel/smp.c | 90 | ||||
| -rw-r--r-- | kernel/sys.c | 9 | ||||
| -rw-r--r-- | kernel/sysctl.c | 8 |
5 files changed, 141 insertions, 5 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 2a0deffa5dbe..4e2e472f6aeb 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1358,6 +1358,10 @@ static int __init parse_crashkernel_simple(char *cmdline, if (*cur == '@') *crash_base = memparse(cur+1, &cur); + else if (*cur != ' ' && *cur != '\0') { + pr_warning("crashkernel: unrecognized char\n"); + return -EINVAL; + } return 0; } @@ -1461,7 +1465,9 @@ static int __init crash_save_vmcoreinfo_init(void) VMCOREINFO_SYMBOL(init_uts_ns); VMCOREINFO_SYMBOL(node_online_map); +#ifdef CONFIG_MMU VMCOREINFO_SYMBOL(swapper_pg_dir); +#endif VMCOREINFO_SYMBOL(_stext); VMCOREINFO_SYMBOL(vmlist); diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 17b232869a04..57bc1fd35b3c 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -15,6 +15,7 @@ #include <linux/acct.h> #include <linux/slab.h> #include <linux/proc_fs.h> +#include <linux/reboot.h> #define BITS_PER_PAGE (PAGE_SIZE*8) @@ -183,6 +184,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) rc = sys_wait4(-1, NULL, __WALL, NULL); } while (rc != -ECHILD); + if (pid_ns->reboot) + current->signal->group_exit_code = pid_ns->reboot; + acct_exit_ns(pid_ns); return; } @@ -217,6 +221,35 @@ static struct ctl_table pid_ns_ctl_table[] = { static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } }; +int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) +{ + if (pid_ns == &init_pid_ns) + return 0; + + switch (cmd) { + case LINUX_REBOOT_CMD_RESTART2: + case LINUX_REBOOT_CMD_RESTART: + pid_ns->reboot = SIGHUP; + break; + + case LINUX_REBOOT_CMD_POWER_OFF: + case LINUX_REBOOT_CMD_HALT: + pid_ns->reboot = SIGINT; + break; + default: + return -EINVAL; + } + + read_lock(&tasklist_lock); + force_sig(SIGKILL, pid_ns->child_reaper); + read_unlock(&tasklist_lock); + + do_exit(0); + + /* Not reached */ + return 0; +} + static __init int pid_namespaces_init(void) { pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC); diff --git a/kernel/smp.c b/kernel/smp.c index db197d60489b..2f8b10ecf759 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -701,3 +701,93 @@ int on_each_cpu(void (*func) (void *info), void *info, int wait) return ret; } EXPORT_SYMBOL(on_each_cpu); + +/** + * on_each_cpu_mask(): Run a function on processors specified by + * cpumask, which may include the local processor. + * @mask: The set of cpus to run on (only runs on online subset). + * @func: The function to run. This must be fast and non-blocking. + * @info: An arbitrary pointer to pass to the function. + * @wait: If true, wait (atomically) until function has completed + * on other CPUs. + * + * If @wait is true, then returns once @func has returned. + * + * You must not call this function with disabled interrupts or + * from a hardware interrupt handler or from a bottom half handler. + */ +void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, + void *info, bool wait) +{ + int cpu = get_cpu(); + + smp_call_function_many(mask, func, info, wait); + if (cpumask_test_cpu(cpu, mask)) { + local_irq_disable(); + func(info); + local_irq_enable(); + } + put_cpu(); +} +EXPORT_SYMBOL(on_each_cpu_mask); + +/* + * on_each_cpu_cond(): Call a function on each processor for which + * the supplied function cond_func returns true, optionally waiting + * for all the required CPUs to finish. This may include the local + * processor. + * @cond_func: A callback function that is passed a cpu id and + * the the info parameter. The function is called + * with preemption disabled. The function should + * return a blooean value indicating whether to IPI + * the specified CPU. + * @func: The function to run on all applicable CPUs. + * This must be fast and non-blocking. + * @info: An arbitrary pointer to pass to both functions. + * @wait: If true, wait (atomically) until function has + * completed on other CPUs. + * @gfp_flags: GFP flags to use when allocating the cpumask + * used internally by the function. + * + * The function might sleep if the GFP flags indicates a non + * atomic allocation is allowed. + * + * Preemption is disabled to protect against CPUs going offline but not online. + * CPUs going online during the call will not be seen or sent an IPI. + * + * You must not call this function with disabled interrupts or + * from a hardware interrupt handler or from a bottom half handler. + */ +void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), + smp_call_func_t func, void *info, bool wait, + gfp_t gfp_flags) +{ + cpumask_var_t cpus; + int cpu, ret; + + might_sleep_if(gfp_flags & __GFP_WAIT); + + if (likely(zalloc_cpumask_var(&cpus, (gfp_flags|__GFP_NOWARN)))) { + preempt_disable(); + for_each_online_cpu(cpu) + if (cond_func(cpu, info)) + cpumask_set_cpu(cpu, cpus); + on_each_cpu_mask(cpus, func, info, wait); + preempt_enable(); + free_cpumask_var(cpus); + } else { + /* + * No free cpumask, bother. No matter, we'll + * just have to IPI them one by one. + */ + preempt_disable(); + for_each_online_cpu(cpu) + if (cond_func(cpu, info)) { + ret = smp_call_function_single(cpu, func, + info, wait); + WARN_ON_ONCE(!ret); + } + preempt_enable(); + } +} +EXPORT_SYMBOL(on_each_cpu_cond); diff --git a/kernel/sys.c b/kernel/sys.c index 9eb7fcab8df6..e7006eb6c1e4 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -444,6 +444,15 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, magic2 != LINUX_REBOOT_MAGIC2C)) return -EINVAL; + /* + * If pid namespaces are enabled and the current task is in a child + * pid_namespace, the command is handled by reboot_pid_ns() which will + * call do_exit(). + */ + ret = reboot_pid_ns(task_active_pid_ns(current), cmd); + if (ret) + return ret; + /* Instead of trying to make the power_off code look like * halt when pm_power_off is not set do it the easy way. */ diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 803a374f6766..52b3a06a02f8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -23,6 +23,7 @@ #include <linux/swap.h> #include <linux/slab.h> #include <linux/sysctl.h> +#include <linux/bitmap.h> #include <linux/signal.h> #include <linux/printk.h> #include <linux/proc_fs.h> @@ -2395,9 +2396,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, } } - while (val_a <= val_b) - set_bit(val_a++, tmp_bitmap); - + bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); first = 0; proc_skip_char(&kbuf, &left, '\n'); } @@ -2440,8 +2439,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, if (*ppos) bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); else - memcpy(bitmap, tmp_bitmap, - BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); + bitmap_copy(bitmap, tmp_bitmap, bitmap_len); } kfree(tmp_bitmap); *lenp -= left; |