[PATCH] threading fix, tid-2.5.47-A3

This introduces the sys_set_thread_address() syscall.  It sets the tid
address (which gets cleared at VM release time) and returns the PID so
that the newly initialized 'initial thread' does not have to do an
additional sys_gettid() call.

It is used to bootstrap a thread group where the original thread user
hasn't had a tid address assigned to it by any parent.

1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index a9f8eb192f9a..accc05f2fef5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -679,6 +679,13 @@ static inline void copy_flags(unsigned long clone_flags, struct task_struct *p)
 	p->flags = new_flags;
 }
 
+asmlinkage int sys_set_tid_address(int *user_tid)
+{
+	current->user_tid = user_tid;
+
+	return current->pid;
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.