linux-kernel - [PATCH 1/2] clone: Declare do

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Message-Id: <1443009569-1508-2-git-send-email-pmladek@suse.com>
Date:	Wed, 23 Sep 2015 13:59:28 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thiago Macieira <thiago.macieira@...el.com>,
	Jiri Kosina <jkosina@...e.com>, linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>
Subject: [PATCH 1/2] clone: Declare do_fork() only when available

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@...e.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

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