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 <oleg@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* include/asm-cris/processor.h
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*
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* Copyright (C) 2000, 2001 Axis Communications AB
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*
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* Authors: Bjorn Wesen Initial version
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*
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*/
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#ifndef __ASM_CRIS_PROCESSOR_H
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#define __ASM_CRIS_PROCESSOR_H
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <arch/processor.h>
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#include <arch/system.h>
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struct task_struct;
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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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 (PAGE_ALIGN(TASK_SIZE / 3))
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/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
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* normally, the stack is found by doing something like p + THREAD_SIZE
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* in CRIS, a page is 8192 bytes, which seems like a sane size
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*/
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#define THREAD_SIZE PAGE_SIZE
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#define KERNEL_STACK_SIZE PAGE_SIZE
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/*
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* At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
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* This macro allows us to find those regs for a task.
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* Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
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* we're in the kernel, won't affect this - only the first user->kernel transition
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* registers are reached by this.
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*/
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#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 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() task_pt_regs(current)
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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extern unsigned long thread_saved_pc(struct task_struct *tsk);
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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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/* Nothing needs to be done. */
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}
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#define init_stack (init_thread_union.stack)
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#define cpu_relax() barrier()
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/*
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* disable hlt during certain critical i/o operations
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*/
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#define HAVE_DISABLE_HLT
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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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#endif /* __ASM_CRIS_PROCESSOR_H */
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