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 bJR9qtgH vaHyYX5Pu0Y4SEW6eeiYbodeZeam4U9Wwop28SjSha7wb28nFY4w/amcB2VOLxArtePL6omyrZ6fl4eNyxhVYB/hTRqc01Y6qhkyCTzQPZJoa3YfS+v2bGsIPVlH6NlUKL9Ck X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: David Hildenbrand (Red Hat) writes: > On 27.10.25 21:21, Ankur Arora wrote: >> Define clear_user_highpages() which clears pages sequentially using >> the single page variant. >> With !CONFIG_HIGHMEM, pages are contiguous so use the range clearing >> primitive clear_user_pages(). >> Signed-off-by: Ankur Arora >> Note: fixed > > That should be dropped. > >> --- >> include/linux/highmem.h | 29 +++++++++++++++++++++++++++++ >> 1 file changed, 29 insertions(+) >> diff --git a/include/linux/highmem.h b/include/linux/highmem.h >> index 105cc4c00cc3..c5f8b1556fd7 100644 >> --- a/include/linux/highmem.h >> +++ b/include/linux/highmem.h >> @@ -199,6 +199,11 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size) >> /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ >> #ifndef clear_user_highpage >> +/** >> + * clear_user_highpage() - clear a page to be mapped to user space >> + * @page: start page >> + * @vaddr: start address of the user mapping >> + */ >> static inline void clear_user_highpage(struct page *page, unsigned long vaddr) >> { >> void *addr = kmap_local_page(page); >> @@ -207,6 +212,30 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) >> } >> #endif >> +/** >> + * clear_user_highpages() - clear a page range to be mapped to user space >> + * @page: start page >> + * @vaddr: start address of the user mapping >> + * @npages: number of pages >> + * >> + * Assumes that all the pages in the region (@page, +@npages) are valid >> + * so this does no exception handling. >> + */ >> +static inline void clear_user_highpages(struct page *page, unsigned long vaddr, >> + unsigned int npages) >> +{ >> + if (!IS_ENABLED(CONFIG_HIGHMEM)) { >> + clear_user_pages(page_address(page), vaddr, page, npages); >> + return; >> + } >> + >> + do { >> + clear_user_highpage(page, vaddr); >> + vaddr += PAGE_SIZE; >> + page++; >> + } while (--npages); >> +} >> + >> #ifndef vma_alloc_zeroed_movable_folio >> /** >> * vma_alloc_zeroed_movable_folio - Allocate a zeroed page for a VMA. > > Acked-by: David Hildenbrand (Red Hat) Thanks (for this and the others.) -- ankur