[PATCH 1/2] clone: Declare do_fork() only when available

[Petr Mladek <pmladek@suse.com>]

The commit 3033f14ab78c32687 ("clone: support passing tls argument via C
rather than pt_regs magic") introduced _do_fork() that allowed to pass
@tls parameter.

The old do_fork() is defined only for architectures that are not ready
to use this way and do not define HAVE_COPY_THREAD_TLS. But the function
is always declared in linux/sched.h.

This patch hides the declaration when the function is not defined.

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
 include/linux/sched.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index b7b9501b41af..f71f1f505923 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2618,7 +2618,9 @@ extern int do_execveat(int, struct filename *,
 		       const char __user * const __user *,
 		       int);
 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
+#ifndef CONFIG_HAVE_COPY_THREAD_TLS
 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
+#endif
 struct task_struct *fork_idle(int);
 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 
-- 
1.8.5.6