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9fc658763b
Patchset annotates arch/* uses of ->thread_info. Ones that really are about access of thread_info of given process are simply switched to task_thread_info(task); ones that deal with access to objects on stack are switched to new helper - task_stack_page(). A _lot_ of the latter are actually open-coded instances of "find where pt_regs are"; those are consolidated into task_pt_regs(task) (many architectures actually have such helper already). Note that these annotations are not mandatory - any code not converted to these helpers still works. However, they clean up a lot of places and have actually caught a number of bugs, so converting out of tree ports would be a good idea... As an example of breakage caught by that stuff, see i386 pt_regs mess - we used to have it open-coded in a bunch of places and when back in April Stas had fixed a bug in copy_thread(), the rest had been left out of sync. That required two followup patches (the latest - just before 2.6.15) _and_ still had left /proc/*/stat eip field broken. Try ps -eo eip on i386 and watch the junk... This patch: new helper - task_stack_page(task). Returns pointer to the memory object containing task stack; usually thread_info of task sits in the beginning of that object. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
63 lines
2.0 KiB
C
63 lines
2.0 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/page.h>
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struct thread_info {
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struct task_struct *task; /* main task structure */
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unsigned long flags;
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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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};
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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 task_thread_info(tsk) (&(tsk)->thread.info)
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#define task_stack_page(tsk) ((void *)(tsk)->thread_info)
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#define current_thread_info() task_thread_info(current)
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#define __HAVE_THREAD_FUNCTIONS
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#define setup_thread_stack(p, org) ({ \
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*(struct task_struct **)(p)->thread_info = (p); \
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task_thread_info(p)->task = (p); \
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})
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#define end_of_stack(p) ((unsigned long *)(p)->thread_info + 1)
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/* entry.S relies on these definitions!
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* bits 0-7 are tested at every exception exit
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* bits 8-15 are also tested at syscall exit
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*/
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#define TIF_SIGPENDING 6 /* signal pending */
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#define TIF_NEED_RESCHED 7 /* rescheduling necessary */
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#define TIF_DELAYED_TRACE 14 /* single step a syscall */
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#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
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#define TIF_MEMDIE 16
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#endif /* _ASM_M68K_THREAD_INFO_H */
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