mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-10 19:39:54 +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]>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* OpenRISC Linux
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* OpenRISC implementation:
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* Copyright (C) 2003 Matjaz Breskvar <[email protected]>
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* Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
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* et al.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __ASM_OPENRISC_PROCESSOR_H
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#define __ASM_OPENRISC_PROCESSOR_H
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#include <asm/spr_defs.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/* Kernel and user SR register setting */
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#define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
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| SPR_SR_DCE | SPR_SR_SM)
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#define USER_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
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| SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
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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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* User space process size. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing.
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*/
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#define TASK_SIZE (0x80000000UL)
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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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#ifndef __ASSEMBLY__
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struct task_struct;
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struct thread_struct {
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};
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/*
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* At user->kernel entry, the pt_regs struct is stacked on the top of the
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* kernel-stack. This macro allows us to find those regs for a task.
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* Notice that subsequent pt_regs stackings, like recursive interrupts
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* occurring while we're in the kernel, won't affect this - only the first
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* user->kernel transition registers are reached by this (i.e. not regs
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* for running signal handler)
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*/
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#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
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/*
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* Dito but for the currently running task
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*/
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#define task_pt_regs(task) user_regs(task_thread_info(task))
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#define current_regs() user_regs(current_thread_info())
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#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
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#define INIT_THREAD { }
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
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void release_thread(struct task_struct *);
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unsigned long get_wchan(struct task_struct *p);
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/*
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* Free current thread data structures etc..
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*/
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extern inline void exit_thread(void)
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{
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/* Nothing needs to be done. */
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}
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/*
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* Return saved PC of a blocked thread. For now, this is the "user" PC
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*/
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extern unsigned long thread_saved_pc(struct task_struct *t);
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#define init_stack (init_thread_union.stack)
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#define cpu_relax() do { } while (0)
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_OPENRISC_PROCESSOR_H */
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