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authorAndrew Morton <akpm@linux-foundation.org>2008-02-04 22:27:22 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:07 -0800
commitbdff746a3915f109bd13730b6847e33e17e91ed3 (patch)
treebacc8edf83f06c4366cbb43fa21213e0a346a6f2
parent59714d65dfbc86d5cb93adc5bac57a921cc2fa84 (diff)
clone: prepare to recycle CLONE_STOPPED
Ulrich says that we never used this clone flags and that nothing should be using it. 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 it. Hopefully we will be able to recycle it. 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. [akpm@linux-foundation.org: it looks like CLONE_DETACHED is being used] Cc: Ulrich Drepper <drepper@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/fork.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 05e0b6f4365..6caf4f23206 100644
--- a/kernel/fork.c
+++ b/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_STOPPED)) {
+ static int __read_mostly count = 100;
+
+ if (count > 0 && 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_STOPPED);
+ }
+ }
+
if (unlikely(current->ptrace)) {
trace = fork_traceflag (clone_flags);
if (trace)