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We can safely use this when CONFIG_HIGHMEM is disabled and if the architecture does not have clear_user_highpage. The first is needed to ensure that contiguous page ranges stay contiguous which precludes intermediate maps via HIGMEM. The second, because if the architecture has clear_user_highpage(), it likely needs flushing magic when clearing the page, magic that we aren't privy to. For both of those cases, just fallback to a loop around clear_user_highpage(). Signed-off-by: Ankur Arora --- include/linux/highmem.h | 45 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 019ab7d8c841..af03db851a1d 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -251,7 +251,14 @@ static inline void clear_user_pages(void *addr, unsigned long vaddr, #endif } -/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ +/** + * clear_user_highpage() - clear a page to be mapped to user space + * @page: start page + * @vaddr: start address of the user mapping + * + * With !CONFIG_HIGHMEM this (and the copy_user_highpage() below) will + * be plain clear_user_page() (and copy_user_page()). + */ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) { void *addr = kmap_local_page(page); @@ -260,6 +267,42 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) } #endif /* clear_user_highpage */ +/** + * 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 defined(clear_user_highpage) || defined(CONFIG_HIGHMEM) + /* + * An architecture defined clear_user_highpage() implies special + * handling is needed. + * + * So we use that or, the generic variant if CONFIG_HIGHMEM is + * enabled. + */ + do { + clear_user_highpage(page, vaddr); + vaddr += PAGE_SIZE; + page++; + } while (--npages); +#else + + /* + * Prefer clear_user_pages() to allow for architectural optimizations + * when operating on contiguous page ranges. + */ + clear_user_pages(page_address(page), vaddr, page, npages); +#endif +} + #ifndef vma_alloc_zeroed_movable_folio /** * vma_alloc_zeroed_movable_folio - Allocate a zeroed page for a VMA. -- 2.31.1