diff options
Diffstat (limited to 'arch/arm/include/asm/pgalloc.h')
| -rw-r--r-- | arch/arm/include/asm/pgalloc.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h index 943504f53f57..49f054cfaea1 100644 --- a/arch/arm/include/asm/pgalloc.h +++ b/arch/arm/include/asm/pgalloc.h @@ -123,6 +123,15 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) static inline void pte_free(struct mm_struct *mm, pgtable_t pte) { pgtable_page_dtor(pte); + + /* + * Before freeing page, check to see whether or not + * __get_user_pages_fast is still walking pages in the mm. + * If this is the case, wait until gup has finished. + */ + while (atomic_read(&mm->context.gup_readers) != 0) + cpu_relax(); + __free_page(pte); } |