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SubjectRe: [patch] O(1) sys_exit(), threading, scalable-exit-2.5.31-A6

the attached patch ontop of BK-curr fixes the ptrace wait4() anomaly that
can be observed in any previous Linux kernel i could get my hands at. So
in fact ->ptrace_children, besides being a speedup, also fixed a bug that
couldnt be fixed in any satisfactory way before.

Ingo

--- linux/kernel/exit.c.orig Tue Aug 20 16:28:57 2002
+++ linux/kernel/exit.c Tue Aug 20 16:30:13 2002
@@ -731,7 +731,7 @@
tsk = next_thread(tsk);
} while (tsk != current);
read_unlock(&tasklist_lock);
- if (flag) {
+ if (flag || !list_empty(&current->ptrace_children)) {
retval = 0;
if (options & WNOHANG)
goto end_wait4;
-
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