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Commit 50062175 authored by Al Viro's avatar Al Viro
Browse files

vm_area_operations: kill ->migrate() 



the only instance this method has ever grown was one in kernfs -
one that call ->migrate() of another vm_ops if it exists.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 777eda2c

fs/kernfs/file.c

+0 −22
Original line number Diff line number Diff line
@@ -448,27 +448,6 @@ static struct mempolicy *kernfs_vma_get_policy(struct vm_area_struct *vma, 
	return pol;

}



static int kernfs_vma_migrate(struct vm_area_struct *vma,

			      const nodemask_t *from, const nodemask_t *to,

			      unsigned long flags)

{

	struct file *file = vma->vm_file;

	struct kernfs_open_file *of = kernfs_of(file);

	int ret;



	if (!of->vm_ops)

		return 0;



	if (!kernfs_get_active(of->kn))

		return 0;



	ret = 0;

	if (of->vm_ops->migrate)

		ret = of->vm_ops->migrate(vma, from, to, flags);



	kernfs_put_active(of->kn);

	return ret;

}

#endif



static const struct vm_operations_struct kernfs_vm_ops = {
@@ -479,7 +458,6 @@ static const struct vm_operations_struct kernfs_vm_ops = { 
#ifdef CONFIG_NUMA

	.set_policy	= kernfs_vma_set_policy,

	.get_policy	= kernfs_vma_get_policy,

	.migrate	= kernfs_vma_migrate,

#endif

};

include/linux/migrate.h

+0 −10
Original line number Diff line number Diff line
@@ -36,9 +36,6 @@ extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, 


extern int migrate_prep(void);

extern int migrate_prep_local(void);

extern int migrate_vmas(struct mm_struct *mm,

		const nodemask_t *from, const nodemask_t *to,

		unsigned long flags);

extern void migrate_page_copy(struct page *newpage, struct page *page);

extern int migrate_huge_page_move_mapping(struct address_space *mapping,

				  struct page *newpage, struct page *page);
@@ -57,13 +54,6 @@ static inline int migrate_pages(struct list_head *l, new_page_t new, 
static inline int migrate_prep(void) { return -ENOSYS; }

static inline int migrate_prep_local(void) { return -ENOSYS; }



static inline int migrate_vmas(struct mm_struct *mm,

		const nodemask_t *from, const nodemask_t *to,

		unsigned long flags)

{

	return -ENOSYS;

}



static inline void migrate_page_copy(struct page *newpage,

				     struct page *page) {}

include/linux/mm.h

+0 −2
Original line number Diff line number Diff line
@@ -286,8 +286,6 @@ struct vm_operations_struct { 
	 */

	struct mempolicy *(*get_policy)(struct vm_area_struct *vma,

					unsigned long addr);

	int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,

		const nodemask_t *to, unsigned long flags);

#endif

	/* called by sys_remap_file_pages() to populate non-linear mapping */

	int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,

mm/mempolicy.c

+0 −5
Original line number Diff line number Diff line
@@ -1047,10 +1047,6 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, 


	down_read(&mm->mmap_sem);



	err = migrate_vmas(mm, from, to, flags);

	if (err)

		goto out;



	/*

	 * Find a 'source' bit set in 'tmp' whose corresponding 'dest'

	 * bit in 'to' is not also set in 'tmp'.  Clear the found 'source'
@@ -1130,7 +1126,6 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, 
		if (err < 0)

			break;

	}

out:

	up_read(&mm->mmap_sem);

	if (err < 0)

		return err;

mm/migrate.c

+0 −21
Original line number Diff line number Diff line
@@ -1536,27 +1536,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, 
	return err;

}



/*

 * Call migration functions in the vma_ops that may prepare

 * memory in a vm for migration. migration functions may perform

 * the migration for vmas that do not have an underlying page struct.

 */

int migrate_vmas(struct mm_struct *mm, const nodemask_t *to,

	const nodemask_t *from, unsigned long flags)

{

 	struct vm_area_struct *vma;

 	int err = 0;



	for (vma = mm->mmap; vma && !err; vma = vma->vm_next) {

 		if (vma->vm_ops && vma->vm_ops->migrate) {

 			err = vma->vm_ops->migrate(vma, to, from, flags);

 			if (err)

 				break;

 		}

 	}

 	return err;

}



#ifdef CONFIG_NUMA_BALANCING

/*

 * Returns true if this is a safe migration target node for misplaced NUMA