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cc43ec1ab0
The preempt_count in the thread_info structure must be initialized to 1. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*
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* include/asm-s390/thread_info.h
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*
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* S390 version
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* Copyright (C) IBM Corp. 2002,2006
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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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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/*
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* Size of kernel stack for each process
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*/
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#ifndef __s390x__
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#ifndef __SMALL_STACK
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#else
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#define THREAD_ORDER 0
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#define ASYNC_ORDER 0
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#endif
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#else /* __s390x__ */
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#ifndef __SMALL_STACK
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#define THREAD_ORDER 2
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#define ASYNC_ORDER 2
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#else
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#endif
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#endif /* __s390x__ */
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#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
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#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/lowcore.h>
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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 must also be changed
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*/
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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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unsigned long flags; /* low level flags */
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unsigned int cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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struct restart_block restart_block;
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};
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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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#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 = 1, \
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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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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
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}
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/* thread information allocation */
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#define alloc_thread_info(tsk) ((struct thread_info *) \
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__get_free_pages(GFP_KERNEL,THREAD_ORDER))
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#define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER)
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#endif
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/*
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* thread information flags bit numbers
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_RESTORE_SIGMASK 1 /* restore signal mask in do_signal() */
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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_RESTART_SVC 4 /* restart svc with new svc number */
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#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
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#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
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#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
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#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
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#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_31BIT 18 /* 32bit process */
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#define TIF_MEMDIE 19
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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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_RESTART_SVC (1<<TIF_RESTART_SVC)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
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#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_31BIT (1<<TIF_31BIT)
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#endif /* __KERNEL__ */
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#define PREEMPT_ACTIVE 0x4000000
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#endif /* _ASM_THREAD_INFO_H */
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