diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/highmem.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index abc20f9810fd..393bd51e5a1f 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -197,15 +197,35 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size) } #endif -/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ #ifndef clear_user_highpage +#ifndef clear_user_page +/** + * clear_user_page() - clear a page to be mapped to user space + * @addr: the address of the page + * @vaddr: the address of the user mapping + * @page: the page + * + * We condition the definition of clear_user_page() on the architecture + * not having a custom clear_user_highpage(). That's because if there + * is some special flushing needed for clear_user_highpage() then it + * is likely that clear_user_page() also needs some magic. And, since + * our only caller is the generic clear_user_highpage(), not defining + * is not much of a loss. + */ +static inline void clear_user_page(void *addr, unsigned long vaddr, struct page *page) +{ + clear_page(addr); +} +#endif + +/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) { void *addr = kmap_local_page(page); clear_user_page(addr, vaddr, page); kunmap_local(addr); } -#endif +#endif /* clear_user_highpage */ #ifndef vma_alloc_zeroed_movable_folio /** |