diff options
Diffstat (limited to 'arch/powerpc/mm/gup.c')
| -rw-r--r-- | arch/powerpc/mm/gup.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c index d7efdbf640c7..fec13200868f 100644 --- a/arch/powerpc/mm/gup.c +++ b/arch/powerpc/mm/gup.c @@ -16,6 +16,16 @@ #ifdef __HAVE_ARCH_PTE_SPECIAL +static inline void get_huge_page_tail(struct page *page) +{ + /* + * __split_huge_page_refcount() cannot run + * from under us. + */ + VM_BUG_ON(atomic_read(&page->_count) < 0); + atomic_inc(&page->_count); +} + /* * The performance critical leaf functions are made noinline otherwise gcc * inlines everything into a single function which results in too much @@ -47,6 +57,8 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, put_page(page); return 0; } + if (PageTail(page)) + get_huge_page_tail(page); pages[*nr] = page; (*nr)++; |