2c922c51e6
kill_off_processes() might miss a valid process, this is because checking for process->mm is not enough. Process' main thread may exit or detach its mm via use_mm(), but other threads may still have a valid mm. To catch this we use find_lock_task_mm(), which walks up all threads and returns an appropriate task (with task lock held). Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
64 lines
1 KiB
C
64 lines
1 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/sched.h"
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#include "linux/spinlock.h"
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#include "linux/slab.h"
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#include "linux/oom.h"
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#include "kern_util.h"
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#include "os.h"
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#include "skas.h"
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void (*pm_power_off)(void);
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static void kill_off_processes(void)
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{
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if (proc_mm)
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/*
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* FIXME: need to loop over userspace_pids
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*/
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os_kill_ptraced_process(userspace_pid[0], 1);
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else {
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struct task_struct *p;
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int pid;
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read_lock(&tasklist_lock);
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for_each_process(p) {
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struct task_struct *t;
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t = find_lock_task_mm(p);
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if (!t)
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continue;
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pid = t->mm->context.id.u.pid;
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task_unlock(t);
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os_kill_ptraced_process(pid, 1);
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}
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read_unlock(&tasklist_lock);
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}
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}
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void uml_cleanup(void)
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{
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kmalloc_ok = 0;
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do_uml_exitcalls();
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kill_off_processes();
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}
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void machine_restart(char * __unused)
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{
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uml_cleanup();
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reboot_skas();
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}
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void machine_power_off(void)
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{
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uml_cleanup();
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halt_skas();
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}
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void machine_halt(void)
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{
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machine_power_off();
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}
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