diff options
| -rw-r--r-- | arch/sparc/mm/gup.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c index a986b5d0571..afcebac144f 100644 --- a/arch/sparc/mm/gup.c +++ b/arch/sparc/mm/gup.c @@ -12,6 +12,17 @@ #include <linux/rwsem.h> #include <asm/pgtable.h> +static inline void get_huge_page_tail(struct page *page) +{ + /* + * __split_huge_page_refcount() cannot run + * from under us. + */ + VM_BUG_ON(page_mapcount(page) < 0); + VM_BUG_ON(atomic_read(&page->_count) != 0); + atomic_inc(&page->_mapcount); +} + /* * The performance critical leaf functions are made noinline otherwise gcc * inlines everything into a single function which results in too much @@ -56,6 +67,8 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, put_page(head); return 0; } + if (head != page) + get_huge_page_tail(page); pages[*nr] = page; (*nr)++; |