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4240c8bf87
Neither the mmap_layout nor the mm_update_next_owner() methods need to be in <linux/sched.h> - move them to the more appropriate <linux/sched/mm.h> header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
#ifndef _LINUX_SCHED_MM_H
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#define _LINUX_SCHED_MM_H
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#include <linux/sched.h>
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#include <linux/mm_types.h>
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#include <linux/gfp.h>
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/*
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* Routines for handling mm_structs
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*/
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extern struct mm_struct * mm_alloc(void);
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/**
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* mmgrab() - Pin a &struct mm_struct.
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* @mm: The &struct mm_struct to pin.
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*
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* Make sure that @mm will not get freed even after the owning task
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* exits. This doesn't guarantee that the associated address space
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* will still exist later on and mmget_not_zero() has to be used before
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* accessing it.
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*
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* This is a preferred way to to pin @mm for a longer/unbounded amount
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* of time.
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*
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* Use mmdrop() to release the reference acquired by mmgrab().
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*
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* See also <Documentation/vm/active_mm.txt> for an in-depth explanation
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* of &mm_struct.mm_count vs &mm_struct.mm_users.
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*/
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static inline void mmgrab(struct mm_struct *mm)
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{
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atomic_inc(&mm->mm_count);
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}
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/* mmdrop drops the mm and the page tables */
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extern void __mmdrop(struct mm_struct *);
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static inline void mmdrop(struct mm_struct *mm)
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{
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if (unlikely(atomic_dec_and_test(&mm->mm_count)))
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__mmdrop(mm);
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}
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static inline void mmdrop_async_fn(struct work_struct *work)
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{
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struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
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__mmdrop(mm);
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}
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static inline void mmdrop_async(struct mm_struct *mm)
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{
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if (unlikely(atomic_dec_and_test(&mm->mm_count))) {
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INIT_WORK(&mm->async_put_work, mmdrop_async_fn);
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schedule_work(&mm->async_put_work);
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}
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}
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/**
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* mmget() - Pin the address space associated with a &struct mm_struct.
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* @mm: The address space to pin.
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*
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* Make sure that the address space of the given &struct mm_struct doesn't
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* go away. This does not protect against parts of the address space being
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* modified or freed, however.
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*
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* Never use this function to pin this address space for an
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* unbounded/indefinite amount of time.
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*
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* Use mmput() to release the reference acquired by mmget().
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*
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* See also <Documentation/vm/active_mm.txt> for an in-depth explanation
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* of &mm_struct.mm_count vs &mm_struct.mm_users.
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*/
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static inline void mmget(struct mm_struct *mm)
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{
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atomic_inc(&mm->mm_users);
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}
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static inline bool mmget_not_zero(struct mm_struct *mm)
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{
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return atomic_inc_not_zero(&mm->mm_users);
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}
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/* mmput gets rid of the mappings and all user-space */
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extern void mmput(struct mm_struct *);
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#ifdef CONFIG_MMU
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/* same as above but performs the slow path from the async context. Can
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* be called from the atomic context as well
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*/
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extern void mmput_async(struct mm_struct *);
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#endif
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/* Grab a reference to a task's mm, if it is not already going away */
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extern struct mm_struct *get_task_mm(struct task_struct *task);
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/*
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* Grab a reference to a task's mm, if it is not already going away
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* and ptrace_may_access with the mode parameter passed to it
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* succeeds.
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*/
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extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
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/* Remove the current tasks stale references to the old mm_struct */
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extern void mm_release(struct task_struct *, struct mm_struct *);
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#ifdef CONFIG_MEMCG
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extern void mm_update_next_owner(struct mm_struct *mm);
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#else
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static inline void mm_update_next_owner(struct mm_struct *mm)
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{
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}
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#endif /* CONFIG_MEMCG */
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#ifdef CONFIG_MMU
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extern void arch_pick_mmap_layout(struct mm_struct *mm);
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extern unsigned long
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arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
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unsigned long, unsigned long);
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extern unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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#else
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static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
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#endif
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#endif /* _LINUX_SCHED_MM_H */
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