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>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
#ifndef __ASM_SH64_THREAD_INFO_H
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#define __ASM_SH64_THREAD_INFO_H
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/*
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* SuperH 5 version
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* Copyright (C) 2003 Paul Mundt
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*/
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/registers.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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/* Put the 4 32-bit fields together to make asm offsetting easier. */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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__u16 cpu;
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mm_segment_t addr_limit;
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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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/*
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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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.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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/* 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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struct thread_info *ti;
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__asm__ __volatile__ ("getcon " __KCR0 ", %0\n\t" : "=r" (ti));
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return ti;
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}
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/* thread information allocation */
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#define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
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#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
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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 /* __ASSEMBLY__ */
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#define THREAD_SIZE 8192
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#define PREEMPT_ACTIVE 0x10000000
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/* thread information flags */
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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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_MEMDIE 4
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH64_THREAD_INFO_H */
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