[PATCH] do_fork(): Rename 'stack_size' argument to reflect actual use

[Alex Dowad <alexinbeijing@gmail.com>]

The 'stack_size' argument is never used to pass a stack size. It's only used when
forking a kernel thread, in which case it is an argument which should be passed
to the 'main' function which the kernel thread executes. Hence, rename it to
'kthread_arg'.

Signed-off-by: Alex Dowad <alexinbeijing@gmail.com>
---

Hi,

Please have a look at this patch. If this is accepted, I have a series of patches
ready for a similar cleanup to all the arch-specific implementations of copy_thread()
(as suggested by Andrew Morton in a private e-mail).

Thank you,
Alex Dowad

 kernel/fork.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index cf65139..b38a2ae 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1186,10 +1186,12 @@ init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
  * It copies the registers, and all the appropriate
  * parts of the process environment (as per the clone
  * flags). The actual kick-off is left to the caller.
+ *
+ * When copying a kernel thread, 'stack_start' is the function to run.
  */
 static struct task_struct *copy_process(unsigned long clone_flags,
 					unsigned long stack_start,
-					unsigned long stack_size,
+					unsigned long kthread_arg,
 					int __user *child_tidptr,
 					struct pid *pid,
 					int trace)
@@ -1401,7 +1403,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	retval = copy_io(clone_flags, p);
 	if (retval)
 		goto bad_fork_cleanup_namespaces;
-	retval = copy_thread(clone_flags, stack_start, stack_size, p);
+	retval = copy_thread(clone_flags, stack_start, kthread_arg, p);
 	if (retval)
 		goto bad_fork_cleanup_io;
 
@@ -1629,8 +1631,8 @@ struct task_struct *fork_idle(int cpu)
  * it and waits for it to finish using the VM if required.
  */
 long do_fork(unsigned long clone_flags,
-	      unsigned long stack_start,
-	      unsigned long stack_size,
+	      unsigned long stack_start, /* or function for kthread to run */
+	      unsigned long kthread_arg,
 	      int __user *parent_tidptr,
 	      int __user *child_tidptr)
 {
@@ -1656,7 +1658,7 @@ long do_fork(unsigned long clone_flags,
 			trace = 0;
 	}
 
-	p = copy_process(clone_flags, stack_start, stack_size,
+	p = copy_process(clone_flags, stack_start, kthread_arg,
 			 child_tidptr, NULL, trace);
 	/*
 	 * Do this prior waking up the new thread - the thread pointer
@@ -1740,7 +1742,7 @@ SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags,
 		 int, tls_val)
 #elif defined(CONFIG_CLONE_BACKWARDS3)
 SYSCALL_DEFINE6(clone, unsigned long, clone_flags, unsigned long, newsp,
-		int, stack_size,
+		int, ignored,
 		int __user *, parent_tidptr,
 		int __user *, child_tidptr,
 		int, tls_val)
-- 
2.0.0.GIT