[RFC] Race condition?

[Kasper Dupont <kasperd@daimi.au.dk>]

Is there a race condition in this piece of code from do_fork in
linux/kernel/fork.c? I cannot see what prevents two processes
from calling this at the same time and both successfully fork
even though the user had only one process left.

        if (atomic_read(&p->user->processes) >= p->rlim[RLIMIT_NPROC].rlim_cur
                      && !capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE))
                goto bad_fork_free;

        atomic_inc(&p->user->__count);
        atomic_inc(&p->user->processes);

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