mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-10 03:20:30 +01:00
Suresh Siddha
55ccf3fe3f
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of the architectures and the rest following the x86 model of flushing the extended register state like fpu there. Remove it and use the arch_dup_task_struct() instead. Suggested-by: Oleg Nesterov <[email protected]> Suggested-by: Linus Torvalds <[email protected]> Signed-off-by: Suresh Siddha <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Acked-by: Benjamin Herrenschmidt <[email protected]> Cc: David Howells <[email protected]> Cc: Koichi Yasutake <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Paul Mundt <[email protected]> Cc: Chris Zankel <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Russell King <[email protected]> Cc: Haavard Skinnemoen <[email protected]> Cc: Mike Frysinger <[email protected]> Cc: Mark Salter <[email protected]> Cc: Aurelien Jacquiot <[email protected]> Cc: Mikael Starvik <[email protected]> Cc: Yoshinori Sato <[email protected]> Cc: Richard Kuo <[email protected]> Cc: Tony Luck <[email protected]> Cc: Michal Simek <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Jonas Bonn <[email protected]> Cc: James E.J. Bottomley <[email protected]> Cc: Helge Deller <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Chen Liqin <[email protected]> Cc: Lennox Wu <[email protected]> Cc: David S. Miller <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Guan Xuetao <[email protected]> Signed-off-by: H. Peter Anvin <[email protected]>
180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <[email protected]>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_PROCESSOR_H
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#define _ASM_MICROBLAZE_PROCESSOR_H
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#include <asm/ptrace.h>
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#include <asm/setup.h>
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#include <asm/registers.h>
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#include <asm/entry.h>
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#include <asm/current.h>
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# ifndef __ASSEMBLY__
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/* from kernel/cpu/mb.c */
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extern const struct seq_operations cpuinfo_op;
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# define cpu_relax() barrier()
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# define cpu_sleep() do {} while (0)
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#define task_pt_regs(tsk) \
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(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
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/* Do necessary setup to start up a newly executed thread. */
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void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
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extern void ret_from_fork(void);
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# endif /* __ASSEMBLY__ */
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# ifndef CONFIG_MMU
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/*
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* User space process size: memory size
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*
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* TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
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* user processes and the kernel is on the same memory region. They
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* both share the memory space and that is limited by the amount of
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* physical memory. thus, we set TASK_SIZE == amount of total memory.
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*/
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# define TASK_SIZE (0x81000000 - 0x80000000)
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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# define current_text_addr() ({ __label__ _l; _l: &&_l; })
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's. We won't be using it
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*/
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# define TASK_UNMAPPED_BASE 0
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/* definition in include/linux/sched.h */
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struct task_struct;
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/* thread_struct is gone. use thread_info instead. */
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struct thread_struct { };
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# define INIT_THREAD { }
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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/* Free all resources held by a thread. */
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static inline void exit_thread(void)
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{
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}
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extern unsigned long thread_saved_pc(struct task_struct *t);
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extern unsigned long get_wchan(struct task_struct *p);
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/*
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* create a kernel thread without removing it from tasklists
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*/
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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# define KSTK_EIP(tsk) (0)
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# define KSTK_ESP(tsk) (0)
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# else /* CONFIG_MMU */
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/*
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* This is used to define STACK_TOP, and with MMU it must be below
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* kernel base to select the correct PGD when handling MMU exceptions.
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*/
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# define TASK_SIZE (CONFIG_KERNEL_START)
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
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# define THREAD_KSP 0
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# ifndef __ASSEMBLY__
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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# define current_text_addr() ({ __label__ _l; _l: &&_l; })
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/* If you change this, you must change the associated assembly-languages
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* constants defined below, THREAD_*.
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*/
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struct thread_struct {
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/* kernel stack pointer (must be first field in structure) */
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unsigned long ksp;
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unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
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void *pgdir; /* root of page-table tree */
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struct pt_regs *regs; /* Pointer to saved register state */
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};
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# define INIT_THREAD { \
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.ksp = sizeof init_stack + (unsigned long)init_stack, \
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.pgdir = swapper_pg_dir, \
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}
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/* Free all resources held by a thread. */
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extern inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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/* Free current thread data structures etc. */
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static inline void exit_thread(void)
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{
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}
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/* Return saved (kernel) PC of a blocked thread. */
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# define thread_saved_pc(tsk) \
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((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
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unsigned long get_wchan(struct task_struct *p);
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/* The size allocated for kernel stacks. This _must_ be a power of two! */
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# define KERNEL_STACK_SIZE 0x2000
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/* Return some info about the user process TASK. */
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# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
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# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
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# define task_pt_regs_plus_args(tsk) \
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((void *)task_pt_regs(tsk))
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# define task_sp(task) (task_regs(task)->r1)
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# define task_pc(task) (task_regs(task)->pc)
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/* Grotty old names for some. */
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# define KSTK_EIP(task) (task_pc(task))
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# define KSTK_ESP(task) (task_sp(task))
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/* FIXME */
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# define deactivate_mm(tsk, mm) do { } while (0)
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# define STACK_TOP TASK_SIZE
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# define STACK_TOP_MAX STACK_TOP
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void disable_hlt(void);
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void enable_hlt(void);
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void default_idle(void);
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#ifdef CONFIG_DEBUG_FS
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extern struct dentry *of_debugfs_root;
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#endif
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# endif /* __ASSEMBLY__ */
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# endif /* CONFIG_MMU */
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#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
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