[PATCH] Hotplug CPU prep

This changes do_fork() to return the task struct, rather than the PID.

Also changes CLONE_PID ("if my pid is 0, copy it") to CLONE_IDLETASK
("set child's pid to zero"), and disallows access to the flag from user
mode.

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index fdf83faccdde..392d2174d84a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -39,7 +39,7 @@ struct exec_domain;
 #define CLONE_FS	0x00000200	/* set if fs info shared between processes */
 #define CLONE_FILES	0x00000400	/* set if open files shared between processes */
 #define CLONE_SIGHAND	0x00000800	/* set if signal handlers and blocked signals shared */
-#define CLONE_PID	0x00001000	/* set if pid shared */
+#define CLONE_IDLETASK	0x00001000	/* set if new pid should be 0 (kernel only)*/
 #define CLONE_PTRACE	0x00002000	/* set if we want to let tracing continue on the child too */
 #define CLONE_VFORK	0x00004000	/* set if the parent wants the child to wake it up on mm_release */
 #define CLONE_PARENT	0x00008000	/* set if we want to have the same parent as the cloner */
@@ -663,7 +663,7 @@ extern void daemonize(void);
 extern task_t *child_reaper;
 
 extern int do_execve(char *, char **, char **, struct pt_regs *);
-extern int do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long);
+extern struct task_struct *do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long);
 
 extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));