dcd497f99a
The preempt_count member of struct thread_info is currently either defined as int, unsigned int or __s32 depending on arch. This patch makes the type of preempt_count an int on all archs. Having preempt_count be an unsigned type prevents the catching of preempt_count < 0 bugs, and using int on some archs and __s32 on others is not exactely "neat" - much nicer when it's just int all over. A previous version of this patch was already ACK'ed by Robert Love, and the only change in this version of the patch compared to the one he ACK'ed is that this one also makes sure the preempt_count member is consistently commented. Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
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* linux/include/asm-arm26/thread_info.h
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*
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* Copyright (C) 2002 Russell King.
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* Copyright (C) 2003 Ian Molton.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_THREAD_INFO_H
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#define __ASM_ARM_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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struct task_struct;
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struct exec_domain;
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#include <linux/compiler.h>
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#include <asm/fpstate.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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typedef unsigned long mm_segment_t;
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struct cpu_context_save {
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__u32 r4;
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__u32 r5;
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__u32 r6;
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__u32 r7;
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__u32 r8;
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__u32 r9;
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__u32 sl;
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__u32 fp;
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__u32 sp;
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__u32 pc;
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};
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/*
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* low level task data that entry.S needs immediate access to.
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* We assume cpu_context follows immedately after cpu_domain.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable, <0 => bug */
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mm_segment_t addr_limit; /* address limit */
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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__u32 cpu; /* cpu */
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struct cpu_context_save cpu_context; /* cpu context */
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struct restart_block restart_block;
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union fp_state fpstate;
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};
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task &tsk, \
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.exec_domain &default_exec_domain, \
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.flags 0, \
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.preempt_count 0, \
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.addr_limit KERNEL_DS, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/*
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* how to get the thread information struct from C
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*/
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static inline struct thread_info *current_thread_info(void) __attribute_const__;
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static inline struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm ("sp");
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return (struct thread_info *)(sp & ~0x1fff);
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}
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/* FIXME - PAGE_SIZE < 32K */
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#define THREAD_SIZE (8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768
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#define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1)
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extern struct thread_info *alloc_thread_info(struct task_struct *task);
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extern void free_thread_info(struct thread_info *);
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#define thread_saved_pc(tsk) \
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((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
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#define thread_saved_fp(tsk) \
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((unsigned long)((tsk)->thread_info->cpu_context.fp))
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#else /* !__ASSEMBLY__ */
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#define TI_FLAGS 0
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#define TI_PREEMPT 4
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#define TI_ADDR_LIMIT 8
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#define TI_TASK 12
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#define TI_EXEC_DOMAIN 16
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#define TI_CPU 20
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#define TI_CPU_SAVE 24
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#define TI_RESTART_BLOCK 28
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#define TI_FPSTATE 68
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#endif
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#define PREEMPT_ACTIVE 0x04000000
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/*
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* thread information flags:
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* TIF_SYSCALL_TRACE - syscall trace active
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* TIF_NOTIFY_RESUME - resumption notification requested
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* TIF_SIGPENDING - signal pending
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* TIF_NEED_RESCHED - rescheduling necessary
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* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
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* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
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*/
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#define TIF_NOTIFY_RESUME 0
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#define TIF_SIGPENDING 1
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#define TIF_NEED_RESCHED 2
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#define TIF_SYSCALL_TRACE 8
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#define TIF_USED_FPU 16
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#define TIF_POLLING_NRFLAG 17
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#define TIF_MEMDIE 18
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_USED_FPU (1 << TIF_USED_FPU)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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/*
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* Change these and you break ASM code in entry-common.S
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*/
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#define _TIF_WORK_MASK 0x000000ff
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#endif /* __KERNEL__ */
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#endif /* __ASM_ARM_THREAD_INFO_H */
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