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>
120 lines
3.5 KiB
C
120 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) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
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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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.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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#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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#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_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_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_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_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_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_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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