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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/mn10300/include/asm/switch_to.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/mn10300/include/asm/switch_to.h')
-rw-r--r--kernel/arch/mn10300/include/asm/switch_to.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/arch/mn10300/include/asm/switch_to.h b/kernel/arch/mn10300/include/asm/switch_to.h
new file mode 100644
index 000000000..393d31173
--- /dev/null
+++ b/kernel/arch/mn10300/include/asm/switch_to.h
@@ -0,0 +1,49 @@
+/* MN10300 task switching definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.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_SWITCH_TO_H
+#define _ASM_SWITCH_TO_H
+
+#include <asm/barrier.h>
+
+struct task_struct;
+struct thread_struct;
+
+#if !defined(CONFIG_LAZY_SAVE_FPU)
+struct fpu_state_struct;
+extern asmlinkage void fpu_save(struct fpu_state_struct *);
+#define switch_fpu(prev, next) \
+ do { \
+ if ((prev)->thread.fpu_flags & THREAD_HAS_FPU) { \
+ (prev)->thread.fpu_flags &= ~THREAD_HAS_FPU; \
+ (prev)->thread.uregs->epsw &= ~EPSW_FE; \
+ fpu_save(&(prev)->thread.fpu_state); \
+ } \
+ } while (0)
+#else
+#define switch_fpu(prev, next) do {} while (0)
+#endif
+
+/* context switching is now performed out-of-line in switch_to.S */
+extern asmlinkage
+struct task_struct *__switch_to(struct thread_struct *prev,
+ struct thread_struct *next,
+ struct task_struct *prev_task);
+
+#define switch_to(prev, next, last) \
+do { \
+ switch_fpu(prev, next); \
+ current->thread.wchan = (u_long) __builtin_return_address(0); \
+ (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
+ mb(); \
+ current->thread.wchan = 0; \
+} while (0)
+
+#endif /* _ASM_SWITCH_TO_H */