Commit 8eaf8833 authored by Wang Wensheng's avatar Wang Wensheng
Browse files

mm/sharepool: Implement mg_sp_walk_page_range() 

ascend inclusion
category: Feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH



---------------------------------------------

This is a simple wrap of walk_page_range() to get all the pages of a
spa. It doesn't support holes.

Signed-off-by: default avatarWang Wensheng <wangwensheng4@huawei.com>
parent eaafc4a2

mm/share_pool.c

+39 −1
Original line number Diff line number Diff line
@@ -1553,7 +1553,36 @@ EXPORT_SYMBOL_GPL(mg_sp_unshare); 
int mg_sp_walk_page_range(unsigned long uva, unsigned long size,

	struct task_struct *tsk, struct sp_walk_data *sp_walk_data)

{

	struct mm_struct *mm;

	int ret = 0;



	if (!sp_is_enabled())

		return -EOPNOTSUPP;



	check_interrupt_context();



	if (unlikely(!sp_walk_data)) {

		pr_err_ratelimited("null pointer when walk page range\n");

		return -EINVAL;

	}

	if (!tsk || (tsk->flags & PF_EXITING))

		return -ESRCH;



	get_task_struct(tsk);

	mm = get_task_mm(tsk);

	if (!mm) {

		put_task_struct(tsk);

		return -ESRCH;

	}



	mmap_write_lock(mm);

	ret = __sp_walk_page_range(uva, size, mm, sp_walk_data);

	mmap_write_unlock(mm);



	mmput(mm);

	put_task_struct(tsk);



	return ret;

}

EXPORT_SYMBOL_GPL(mg_sp_walk_page_range);
@@ -1563,6 +1592,15 @@ EXPORT_SYMBOL_GPL(mg_sp_walk_page_range); 
 */

void mg_sp_walk_page_free(struct sp_walk_data *sp_walk_data)

{

	if (!sp_is_enabled())

		return;



	check_interrupt_context();



	if (!sp_walk_data)

		return;



	__sp_walk_page_free(sp_walk_data);

}

EXPORT_SYMBOL_GPL(mg_sp_walk_page_free);