arch: Remove Itanium (IA-64) architecture

[linux-block.git] / arch / ia64 / include / asm / switch_to.h

diff --git a/arch/ia64/include/asm/switch_to.h b/arch/ia64/include/asm/switch_to.h
deleted file mode 100644 (file)
index a5a4e09..0000000
--- a/arch/ia64/include/asm/switch_to.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Low-level task switching. This is based on information published in
- * the Processor Abstraction Layer and the System Abstraction Layer
- * manual.
- *
- * Copyright (C) 1998-2003 Hewlett-Packard Co
- *     David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
- * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
- */
-#ifndef _ASM_IA64_SWITCH_TO_H
-#define _ASM_IA64_SWITCH_TO_H
-
-#include <linux/percpu.h>
-
-struct task_struct;
-
-/*
- * Context switch from one thread to another.  If the two threads have
- * different address spaces, schedule() has already taken care of
- * switching to the new address space by calling switch_mm().
- *
- * Disabling access to the fph partition and the debug-register
- * context switch MUST be done before calling ia64_switch_to() since a
- * newly created thread returns directly to
- * ia64_ret_from_syscall_clear_r8.
- */
-extern struct task_struct *ia64_switch_to (void *next_task);
-
-extern void ia64_save_extra (struct task_struct *task);
-extern void ia64_load_extra (struct task_struct *task);
-
-#define IA64_HAS_EXTRA_STATE(t)                                                        \
-       ((t)->thread.flags & (IA64_THREAD_DBG_VALID|IA64_THREAD_PM_VALID))
-
-#define __switch_to(prev,next,last) do {                                                        \
-       if (IA64_HAS_EXTRA_STATE(prev))                                                          \
-               ia64_save_extra(prev);                                                           \
-       if (IA64_HAS_EXTRA_STATE(next))                                                          \
-               ia64_load_extra(next);                                                           \
-       ia64_psr(task_pt_regs(next))->dfh = !ia64_is_local_fpu_owner(next);                      \
-       (last) = ia64_switch_to((next));                                                         \
-} while (0)
-
-#ifdef CONFIG_SMP
-/*
- * In the SMP case, we save the fph state when context-switching away from a thread that
- * modified fph.  This way, when the thread gets scheduled on another CPU, the CPU can
- * pick up the state from task->thread.fph, avoiding the complication of having to fetch
- * the latest fph state from another CPU.  In other words: eager save, lazy restore.
- */
-# define switch_to(prev,next,last) do {                                                \
-       if (ia64_psr(task_pt_regs(prev))->mfh && ia64_is_local_fpu_owner(prev)) {                               \
-               ia64_psr(task_pt_regs(prev))->mfh = 0;                  \
-               (prev)->thread.flags |= IA64_THREAD_FPH_VALID;                  \
-               __ia64_save_fpu((prev)->thread.fph);                            \
-       }                                                                       \
-       __switch_to(prev, next, last);                                          \
-       /* "next" in old context is "current" in new context */                 \
-       if (unlikely((current->thread.flags & IA64_THREAD_MIGRATION) &&        \
-                    (task_cpu(current) !=                                     \
-                                     task_thread_info(current)->last_cpu))) { \
-               task_thread_info(current)->last_cpu = task_cpu(current);       \
-       }                                                                      \
-} while (0)
-#else
-# define switch_to(prev,next,last)     __switch_to(prev, next, last)
-#endif
-
-#endif /* _ASM_IA64_SWITCH_TO_H */