tracing: Fix a possible race when disabling buffered events

[platform/kernel/linux-starfive.git] / mm / page_table_check.c

diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 433dbce..4d05065 100644 (file)
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -69,6 +69,8 @@ static void page_table_check_clear(struct mm_struct *mm, unsigned long addr,
 
        page = pfn_to_page(pfn);
        page_ext = page_ext_get(page);
+
+       BUG_ON(PageSlab(page));
        anon = PageAnon(page);
 
        for (i = 0; i < pgcnt; i++) {
@@ -105,6 +107,8 @@ static void page_table_check_set(struct mm_struct *mm, unsigned long addr,
 
        page = pfn_to_page(pfn);
        page_ext = page_ext_get(page);
+
+       BUG_ON(PageSlab(page));
        anon = PageAnon(page);
 
        for (i = 0; i < pgcnt; i++) {
@@ -131,6 +135,8 @@ void __page_table_check_zero(struct page *page, unsigned int order)
        struct page_ext *page_ext;
        unsigned long i;
 
+       BUG_ON(PageSlab(page));
+
        page_ext = page_ext_get(page);
        BUG_ON(!page_ext);
        for (i = 0; i < (1ul << order); i++) {