73b9ebfe12
fork_idle() does unhash_process() just after copy_process(). Contrary, boot_cpu's idle thread explicitely registers itself for each pid_type with nr = 0. copy_process() already checks p->pid != 0 before process_counts++, I think we can just skip attach_pid() calls and job control inits for idle threads and kill unhash_process(). We don't need to cleanup ->proc_dentry in fork_idle() because with this patch idle threads are never hashed in kernel/pid.c:pid_hash[]. We don't need to hash pid == 0 in pidmap_init(). free_pidmap() is never called with pid == 0 arg, so it will never be reused. So it is still possible to use pid == 0 in any PIDTYPE_xxx namespace from kernel/pid.c's POV. However with this patch we don't hash pid == 0 for PIDTYPE_PID case. We still have have PIDTYPE_PGID/PIDTYPE_SID entries with pid == 0: /sbin/init and kernel threads which don't call daemonize(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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.. | ||
skas | ||
tt | ||
Makefile | ||
asm-offsets.c | ||
config.c.in | ||
dyn.lds.S | ||
exec_kern.c | ||
exitcode.c | ||
gmon_syms.c | ||
gprof_syms.c | ||
init_task.c | ||
initrd.c | ||
irq.c | ||
ksyms.c | ||
mem.c | ||
physmem.c | ||
process_kern.c | ||
ptrace.c | ||
reboot.c | ||
resource.c | ||
sigio_kern.c | ||
signal_kern.c | ||
smp.c | ||
syscall.c | ||
syscall_kern.c | ||
sysrq.c | ||
time.c | ||
time_kern.c | ||
tlb.c | ||
trap_kern.c | ||
uaccess.c | ||
um_arch.c | ||
umid.c | ||
uml.lds.S | ||
vmlinux.lds.S |