mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-18 00:24:39 +00:00
68e21be291
Move the following task->mm helper APIs into a new header file, <linux/sched/mm.h>, to further reduce the size and complexity of <linux/sched.h>. Here are how the APIs are used in various kernel files: # mm_alloc(): arch/arm/mach-rpc/ecard.c fs/exec.c include/linux/sched/mm.h kernel/fork.c # __mmdrop(): arch/arc/include/asm/mmu_context.h include/linux/sched/mm.h kernel/fork.c # mmdrop(): arch/arm/mach-rpc/ecard.c arch/m68k/sun3/mmu_emu.c arch/x86/mm/tlb.c drivers/gpu/drm/amd/amdkfd/kfd_process.c drivers/gpu/drm/i915/i915_gem_userptr.c drivers/infiniband/hw/hfi1/file_ops.c drivers/vfio/vfio_iommu_spapr_tce.c fs/exec.c fs/proc/base.c fs/proc/task_mmu.c fs/proc/task_nommu.c fs/userfaultfd.c include/linux/mmu_notifier.h include/linux/sched/mm.h kernel/fork.c kernel/futex.c kernel/sched/core.c mm/khugepaged.c mm/ksm.c mm/mmu_context.c mm/mmu_notifier.c mm/oom_kill.c virt/kvm/kvm_main.c # mmdrop_async_fn(): include/linux/sched/mm.h # mmdrop_async(): include/linux/sched/mm.h kernel/fork.c # mmget_not_zero(): fs/userfaultfd.c include/linux/sched/mm.h mm/oom_kill.c # mmput(): arch/arc/include/asm/mmu_context.h arch/arc/kernel/troubleshoot.c arch/frv/mm/mmu-context.c arch/powerpc/platforms/cell/spufs/context.c arch/sparc/include/asm/mmu_context_32.h drivers/android/binder.c drivers/gpu/drm/etnaviv/etnaviv_gem.c drivers/gpu/drm/i915/i915_gem_userptr.c drivers/infiniband/core/umem.c drivers/infiniband/core/umem_odp.c drivers/infiniband/core/uverbs_main.c drivers/infiniband/hw/mlx4/main.c drivers/infiniband/hw/mlx5/main.c drivers/infiniband/hw/usnic/usnic_uiom.c drivers/iommu/amd_iommu_v2.c drivers/iommu/intel-svm.c drivers/lguest/lguest_user.c drivers/misc/cxl/fault.c drivers/misc/mic/scif/scif_rma.c drivers/oprofile/buffer_sync.c drivers/vfio/vfio_iommu_type1.c drivers/vhost/vhost.c drivers/xen/gntdev.c fs/exec.c fs/proc/array.c fs/proc/base.c fs/proc/task_mmu.c fs/proc/task_nommu.c fs/userfaultfd.c include/linux/sched/mm.h kernel/cpuset.c kernel/events/core.c kernel/events/uprobes.c kernel/exit.c kernel/fork.c kernel/ptrace.c kernel/sys.c kernel/trace/trace_output.c kernel/tsacct.c mm/memcontrol.c mm/memory.c mm/mempolicy.c mm/migrate.c mm/mmu_notifier.c mm/nommu.c mm/oom_kill.c mm/process_vm_access.c mm/rmap.c mm/swapfile.c mm/util.c virt/kvm/async_pf.c # mmput_async(): include/linux/sched/mm.h kernel/fork.c mm/oom_kill.c # get_task_mm(): arch/arc/kernel/troubleshoot.c arch/powerpc/platforms/cell/spufs/context.c drivers/android/binder.c drivers/gpu/drm/etnaviv/etnaviv_gem.c drivers/infiniband/core/umem.c drivers/infiniband/core/umem_odp.c drivers/infiniband/hw/mlx4/main.c drivers/infiniband/hw/mlx5/main.c drivers/infiniband/hw/usnic/usnic_uiom.c drivers/iommu/amd_iommu_v2.c drivers/iommu/intel-svm.c drivers/lguest/lguest_user.c drivers/misc/cxl/fault.c drivers/misc/mic/scif/scif_rma.c drivers/oprofile/buffer_sync.c drivers/vfio/vfio_iommu_type1.c drivers/vhost/vhost.c drivers/xen/gntdev.c fs/proc/array.c fs/proc/base.c fs/proc/task_mmu.c include/linux/sched/mm.h kernel/cpuset.c kernel/events/core.c kernel/exit.c kernel/fork.c kernel/ptrace.c kernel/sys.c kernel/trace/trace_output.c kernel/tsacct.c mm/memcontrol.c mm/memory.c mm/mempolicy.c mm/migrate.c mm/mmu_notifier.c mm/nommu.c mm/util.c # mm_access(): fs/proc/base.c include/linux/sched/mm.h kernel/fork.c mm/process_vm_access.c # mm_release(): arch/arc/include/asm/mmu_context.h fs/exec.c include/linux/sched/mm.h include/uapi/linux/sched.h kernel/exit.c kernel/fork.c 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>
103 lines
3 KiB
C
103 lines
3 KiB
C
#ifndef _LINUX_SCHED_MM_H
|
|
#define _LINUX_SCHED_MM_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/gfp.h>
|
|
|
|
/*
|
|
* Routines for handling mm_structs
|
|
*/
|
|
extern struct mm_struct * mm_alloc(void);
|
|
|
|
/**
|
|
* mmgrab() - Pin a &struct mm_struct.
|
|
* @mm: The &struct mm_struct to pin.
|
|
*
|
|
* Make sure that @mm will not get freed even after the owning task
|
|
* exits. This doesn't guarantee that the associated address space
|
|
* will still exist later on and mmget_not_zero() has to be used before
|
|
* accessing it.
|
|
*
|
|
* This is a preferred way to to pin @mm for a longer/unbounded amount
|
|
* of time.
|
|
*
|
|
* Use mmdrop() to release the reference acquired by mmgrab().
|
|
*
|
|
* See also <Documentation/vm/active_mm.txt> for an in-depth explanation
|
|
* of &mm_struct.mm_count vs &mm_struct.mm_users.
|
|
*/
|
|
static inline void mmgrab(struct mm_struct *mm)
|
|
{
|
|
atomic_inc(&mm->mm_count);
|
|
}
|
|
|
|
/* mmdrop drops the mm and the page tables */
|
|
extern void __mmdrop(struct mm_struct *);
|
|
static inline void mmdrop(struct mm_struct *mm)
|
|
{
|
|
if (unlikely(atomic_dec_and_test(&mm->mm_count)))
|
|
__mmdrop(mm);
|
|
}
|
|
|
|
static inline void mmdrop_async_fn(struct work_struct *work)
|
|
{
|
|
struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
|
|
__mmdrop(mm);
|
|
}
|
|
|
|
static inline void mmdrop_async(struct mm_struct *mm)
|
|
{
|
|
if (unlikely(atomic_dec_and_test(&mm->mm_count))) {
|
|
INIT_WORK(&mm->async_put_work, mmdrop_async_fn);
|
|
schedule_work(&mm->async_put_work);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mmget() - Pin the address space associated with a &struct mm_struct.
|
|
* @mm: The address space to pin.
|
|
*
|
|
* Make sure that the address space of the given &struct mm_struct doesn't
|
|
* go away. This does not protect against parts of the address space being
|
|
* modified or freed, however.
|
|
*
|
|
* Never use this function to pin this address space for an
|
|
* unbounded/indefinite amount of time.
|
|
*
|
|
* Use mmput() to release the reference acquired by mmget().
|
|
*
|
|
* See also <Documentation/vm/active_mm.txt> for an in-depth explanation
|
|
* of &mm_struct.mm_count vs &mm_struct.mm_users.
|
|
*/
|
|
static inline void mmget(struct mm_struct *mm)
|
|
{
|
|
atomic_inc(&mm->mm_users);
|
|
}
|
|
|
|
static inline bool mmget_not_zero(struct mm_struct *mm)
|
|
{
|
|
return atomic_inc_not_zero(&mm->mm_users);
|
|
}
|
|
|
|
/* mmput gets rid of the mappings and all user-space */
|
|
extern void mmput(struct mm_struct *);
|
|
#ifdef CONFIG_MMU
|
|
/* same as above but performs the slow path from the async context. Can
|
|
* be called from the atomic context as well
|
|
*/
|
|
extern void mmput_async(struct mm_struct *);
|
|
#endif
|
|
|
|
/* Grab a reference to a task's mm, if it is not already going away */
|
|
extern struct mm_struct *get_task_mm(struct task_struct *task);
|
|
/*
|
|
* Grab a reference to a task's mm, if it is not already going away
|
|
* and ptrace_may_access with the mode parameter passed to it
|
|
* succeeds.
|
|
*/
|
|
extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
|
|
/* Remove the current tasks stale references to the old mm_struct */
|
|
extern void mm_release(struct task_struct *, struct mm_struct *);
|
|
|
|
#endif /* _LINUX_SCHED_MM_H */
|