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>
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
#ifndef _ASM_M68K_THREAD_INFO_H
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#define _ASM_M68K_THREAD_INFO_H
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#include <asm/types.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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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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int preempt_count; /* 0 => preemptable, <0 => BUG */
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__u32 cpu; /* should always be 0 on m68k */
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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 PREEMPT_ACTIVE 0x4000000
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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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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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/* THREAD_SIZE should be 8k, so handle differently for 4k and 8k machines */
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#if PAGE_SHIFT == 13 /* 8k machines */
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#define alloc_thread_info(tsk) ((struct thread_info *)__get_free_pages(GFP_KERNEL,0))
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#define free_thread_info(ti) free_pages((unsigned long)(ti),0)
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#else /* otherwise assume 4k pages */
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#define alloc_thread_info(tsk) ((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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#endif /* PAGE_SHIFT == 13 */
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//#define init_thread_info (init_task.thread.info)
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#define init_stack (init_thread_union.stack)
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#define current_thread_info() (current->thread_info)
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#define __HAVE_THREAD_FUNCTIONS
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_DELAYED_TRACE 1 /* single step a syscall */
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#define TIF_NOTIFY_RESUME 2 /* resumption notification requested */
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#define TIF_SIGPENDING 3 /* signal pending */
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#define TIF_NEED_RESCHED 4 /* rescheduling necessary */
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#define TIF_MEMDIE 5
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extern int thread_flag_fixme(void);
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/*
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* flag set/clear/test wrappers
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* - pass TIF_xxxx constants to these functions
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*/
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#define __set_tsk_thread_flag(tsk, flag, val) ({ \
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switch (flag) { \
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case TIF_SIGPENDING: \
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tsk->thread.work.sigpending = val; \
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break; \
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case TIF_NEED_RESCHED: \
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tsk->thread.work.need_resched = val; \
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break; \
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case TIF_SYSCALL_TRACE: \
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tsk->thread.work.syscall_trace = val; \
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break; \
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case TIF_MEMDIE: \
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tsk->thread.work.memdie = val; \
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break; \
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default: \
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thread_flag_fixme(); \
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} \
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})
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#define __get_tsk_thread_flag(tsk, flag) ({ \
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int ___res; \
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switch (flag) { \
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case TIF_SIGPENDING: \
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___res = tsk->thread.work.sigpending; \
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break; \
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case TIF_NEED_RESCHED: \
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___res = tsk->thread.work.need_resched; \
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break; \
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case TIF_SYSCALL_TRACE: \
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___res = tsk->thread.work.syscall_trace;\
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break; \
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case TIF_MEMDIE: \
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___res = tsk->thread.work.memdie;\
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break; \
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default: \
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___res = thread_flag_fixme(); \
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} \
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___res; \
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})
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#define __get_set_tsk_thread_flag(tsk, flag, val) ({ \
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int __res = __get_tsk_thread_flag(tsk, flag); \
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__set_tsk_thread_flag(tsk, flag, val); \
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__res; \
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})
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#define set_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, ~0)
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#define clear_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, 0)
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#define test_and_set_tsk_thread_flag(tsk, flag) __get_set_tsk_thread_flag(tsk, flag, ~0)
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#define test_tsk_thread_flag(tsk, flag) __get_tsk_thread_flag(tsk, flag)
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#define set_thread_flag(flag) set_tsk_thread_flag(current, flag)
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#define clear_thread_flag(flag) clear_tsk_thread_flag(current, flag)
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#define test_thread_flag(flag) test_tsk_thread_flag(current, flag)
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#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
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#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
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#endif /* _ASM_M68K_THREAD_INFO_H */
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