From: Andrew Morton Ulrich says that we never used these clone flags and that nothing should be using them. As we're down to only a single bit left in clone's flags argument, let's add a warning to check that no userspace is actually using these. Hopefully we will be able to recycle them. Roland said: CLONE_STOPPED was previously used by some NTPL versions when under thread_db (i.e. only when being actively debugged by gdb), but not for a long time now, and it never worked reliably when it was used. Removing it seems fine to me. Cc: Ulrich Drepper Cc: Ingo Molnar Cc: Roland McGrath Signed-off-by: Andrew Morton --- kernel/fork.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff -puN kernel/fork.c~clone-prepare-to-recycle-clone_detached-and-clone_stopped kernel/fork.c --- a/kernel/fork.c~clone-prepare-to-recycle-clone_detached-and-clone_stopped +++ a/kernel/fork.c @@ -1450,6 +1450,23 @@ long do_fork(unsigned long clone_flags, int trace = 0; long nr; + /* + * We hope to recycle these flags after 2.6.26 + */ + if (unlikely(clone_flags & (CLONE_DETACHED|CLONE_STOPPED))) { + static int __read_mostly count = 100; + + if (count && printk_ratelimit()) { + char comm[TASK_COMM_LEN]; + + count--; + printk(KERN_INFO "fork(): process `%s' used deprecated " + "clone flags 0x%lx\n", + get_task_comm(comm, current), + clone_flags & (CLONE_DETACHED|CLONE_STOPPED)); + } + } + if (unlikely(current->ptrace)) { trace = fork_traceflag (clone_flags); if (trace) _