diff options
Diffstat (limited to 'mm/gup.c')
| -rw-r--r-- | mm/gup.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/gup.c b/mm/gup.c index 61ee405ec558..e19ff770eb4c 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -989,6 +989,7 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) * -- If nr_pages is >0, but no pages were pinned, returns -errno. * -- If nr_pages is >0, and some pages were pinned, returns the number of * pages pinned. Again, this may be less than nr_pages. + * -- 0 return value is possible when the fault would need to be retried. * * The caller is responsible for releasing returned @pages, via put_page(). * @@ -1265,6 +1266,10 @@ retry: } EXPORT_SYMBOL_GPL(fixup_user_fault); +/* + * Please note that this function, unlike __get_user_pages will not + * return 0 for nr_pages > 0 without FOLL_NOWAIT + */ static __always_inline long __get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, |