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![Jesper Juhl](/assets/img/avatar_default.png)
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>
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
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* include/asm-v850/thread_info.h -- v850 low-level thread information
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*
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* Copyright (C) 2002 NEC Corporation
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* Copyright (C) 2002 Miles Bader <miles@gnu.org>
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* This file was derived from the PPC version, include/asm-ppc/thread_info.h
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* which was adapted from the i386 version by Paul Mackerras
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*/
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#ifndef __V850_THREAD_INFO_H__
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#define __V850_THREAD_INFO_H__
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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/*
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* low level task data.
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* If you change this, change the TI_* offsets below to match.
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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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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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struct restart_block restart_block;
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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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/*
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* macros/functions for gaining access to the thread information structure
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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, 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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/*
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* Offsets in thread_info structure, used in assembly code
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*/
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#define TI_TASK 0
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#define TI_EXECDOMAIN 4
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#define TI_FLAGS 8
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#define TI_CPU 12
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#define TI_PREEMPT 16
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#define PREEMPT_ACTIVE 0x4000000
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/*
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* thread information flag 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_POLLING_NRFLAG 4 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_MEMDIE 5
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/* as above, but as bit values */
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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_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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/* Size of kernel stack for each process. */
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#define THREAD_SIZE 0x2000
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/* The alignment of kernel threads, with thread_info structures at their
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base. Thus, a pointer for a task's task structure can be derived from
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its kernel stack pointer. */
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#define THREAD_ALIGNMENT THREAD_SIZE
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#define THREAD_MASK (-THREAD_ALIGNMENT)
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#ifdef __ASSEMBLY__
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/* Put a pointer to the current thread_info structure into REG. Note that
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this definition requires THREAD_MASK to be representable as a signed
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16-bit value. */
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#define GET_CURRENT_THREAD(reg) \
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/* Use `addi' and then `and' instead of just `andi', because \
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`addi' sign-extends the immediate value, whereas `andi' \
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zero-extends it. */ \
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addi THREAD_MASK, r0, reg; \
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and sp, reg
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#else
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/* Return a pointer to the current thread_info structure. */
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static inline struct thread_info *current_thread_info (void)
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{
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register unsigned long sp __asm__ ("sp");
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return (struct thread_info *)(sp & THREAD_MASK);
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* __V850_THREAD_INFO_H__ */
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