linux-kernel - [PATCH 20/35] Split the switch_to() wrapper out of asm-generic/system.h [ver #2]

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Message-ID: <20120312233926.13888.93973.stgit@warthog.procyon.org.uk>
Date:	Mon, 12 Mar 2012 23:39:27 +0000
From:	David Howells <dhowells@...hat.com>
To:	paul.gortmaker@...driver.com, hpa@...or.com
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, arnd@...db.de,
	David Howells <dhowells@...hat.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 20/35] Split the switch_to() wrapper out of
 asm-generic/system.h [ver #2]

Split the switch_to() wrapper out of asm-generic/system.h into its own
asm-generic/system.h as part of the asm/system.h disintegration.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Arnd Bergmann <arnd@...db.de>
---

 include/asm-generic/switch_to.h |   30 ++++++++++++++++++++++++++++++
 include/asm-generic/system.h    |   17 +----------------
 2 files changed, 31 insertions(+), 16 deletions(-)
 create mode 100644 include/asm-generic/switch_to.h

diff --git a/include/asm-generic/switch_to.h b/include/asm-generic/switch_to.h
new file mode 100644
index 0000000..052c4ac
--- /dev/null
+++ b/include/asm-generic/switch_to.h
@@ -0,0 +1,30 @@
+/* Generic task switch macro wrapper, based on MN10300 definitions.
+ *
+ * It should be possible to use these on really simple architectures,
+ * but it serves more as a starting point for new ports.
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@...hat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef __ASM_GENERIC_SWITCH_TO_H
+#define __ASM_GENERIC_SWITCH_TO_H
+
+#include <linux/thread_info.h>
+
+/*
+ * Context switching is now performed out-of-line in switch_to.S
+ */
+extern struct task_struct *__switch_to(struct task_struct *,
+				       struct task_struct *);
+
+#define switch_to(prev, next, last)					\
+	do {								\
+		((last) = __switch_to((prev), (next)));			\
+	} while (0)
+
+#endif /* __ASM_GENERIC_SWITCH_TO_H */
diff --git a/include/asm-generic/system.h b/include/asm-generic/system.h
index 54cd124..f2b8eb4 100644
--- a/include/asm-generic/system.h
+++ b/include/asm-generic/system.h
@@ -14,25 +14,10 @@
 #ifndef __ASM_GENERIC_SYSTEM_H
 #define __ASM_GENERIC_SYSTEM_H
 
-#ifndef __ASSEMBLY__
-
-#include <linux/types.h>
-
 #include <asm/barrier.h>
 #include <asm/cmpxchg.h>
-
-struct task_struct;
-
-/* context switching is now performed out-of-line in switch_to.S */
-extern struct task_struct *__switch_to(struct task_struct *,
-		struct task_struct *);
-#define switch_to(prev, next, last)					\
-	do {								\
-		((last) = __switch_to((prev), (next)));			\
-	} while (0)
+#include <asm/switch_to.h>
 
 #define arch_align_stack(x) (x)
 
-#endif /* !__ASSEMBLY__ */
-
 #endif /* __ASM_GENERIC_SYSTEM_H */

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