16a8016372
Make default just return 0. The current default (checking TIF_POLLING_NRFLAG) is taken to architectures that need it; ones that don't do polling in their idle threads don't need to defined TIF_POLLING_NRFLAG at all. ia64 defined both TS_POLLING (used by its tsk_is_polling()) and TIF_POLLING_NRFLAG (not used at all). Killed the latter... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
172 lines
4.7 KiB
C
172 lines
4.7 KiB
C
/* MN10300 Low-level thread information
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <asm/page.h>
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#define PREEMPT_ACTIVE 0x10000000
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#ifdef CONFIG_4KSTACKS
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#define THREAD_SIZE (4096)
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#define THREAD_SIZE_ORDER (0)
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#else
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#define THREAD_SIZE (8192)
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#define THREAD_SIZE_ORDER (1)
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#endif
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#define STACK_WARN (THREAD_SIZE / 8)
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants
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* must also be changed
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*/
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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struct thread_info {
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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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struct pt_regs *frame; /* current exception frame */
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unsigned long flags; /* low level flags */
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__u32 cpu; /* current CPU */
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__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* thread address space:
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0-0xBFFFFFFF for user-thead
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0-0xFFFFFFFF for kernel-thread
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*/
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struct restart_block restart_block;
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__u8 supervisor_stack[0];
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};
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#define thread_info_to_uregs(ti) \
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((struct pt_regs *) \
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((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
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#else /* !__ASSEMBLY__ */
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#ifndef __ASM_OFFSETS_H__
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#include <asm/asm-offsets.h>
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#endif
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#endif
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#ifndef __ASSEMBLY__
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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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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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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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#define init_uregs \
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((struct pt_regs *) \
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((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
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extern struct thread_info *__current_ti;
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/* how to get the thread information struct from C */
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static inline __attribute__((const))
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struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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asm("mov sp,%0\n"
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"and %1,%0\n"
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: "=d" (ti)
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: "i" (~(THREAD_SIZE - 1))
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: "cc");
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return ti;
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}
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static inline __attribute__((const))
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struct pt_regs *current_frame(void)
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{
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return current_thread_info()->frame;
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}
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/* how to get the current stack pointer from C */
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static inline unsigned long current_stack_pointer(void)
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{
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unsigned long sp;
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asm("mov sp,%0; ":"=r" (sp));
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return sp;
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}
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#ifndef CONFIG_KGDB
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void arch_release_thread_info(struct thread_info *ti);
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#endif
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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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#else /* !__ASSEMBLY__ */
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#ifndef __VMLINUX_LDS__
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/* how to get the thread information struct from ASM */
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.macro GET_THREAD_INFO reg
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mov sp,\reg
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and -THREAD_SIZE,\reg
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.endm
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#endif
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#endif
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to
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* access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
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#define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE)
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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_SINGLESTEP +(1 << TIF_SINGLESTEP)
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#define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG)
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#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
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#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
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#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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