Commit 2a9df328 authored by Liu Shixin's avatar Liu Shixin
Browse files

mm/dynamic_hugetlb: set PagePool to bad page 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6XOIE


CVE: NA

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

Before discard the bad page, set PagePool flag to distinguish from free
page. And increase used_pages to guarantee used + freed = total.

Signed-off-by: default avatarLiu Shixin <liushixin2@huawei.com>
parent e5d96a31

mm/dynamic_hugetlb.c

+8 −1
Original line number Diff line number Diff line
@@ -529,6 +529,13 @@ static struct page *__alloc_page_from_dhugetlb_pool(void) 
	spin_lock_irqsave(&percpu_pool->lock, flags);



	do {

		/*

		 * Before discard the bad page, set PagePool flag to

		 * distinguish from free page. And increase used_pages

		 * to guarantee used + freed = total.

		 */

		if (page)

			SetPagePool(page);

		page = NULL;

		if (percpu_pool->free_pages == 0) {

			int ret;
@@ -544,8 +551,8 @@ static struct page *__alloc_page_from_dhugetlb_pool(void) 
		page = list_entry(percpu_pool->head_page.next, struct page, lru);

		list_del(&page->lru);

		percpu_pool->free_pages--;

	} while (page && check_new_page(page));

		percpu_pool->used_pages++;

	} while (page && check_new_page(page));

	SetPagePool(page);



unlock: