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In absence of architectural primitives, we just clear pages sequentially. Signed-off-by: Ankur Arora --- include/linux/mm.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1ae97a0b8ec7..0cde9b01da5e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3768,6 +3768,44 @@ static inline void clear_page_guard(struct zone *zon= e, struct page *page, unsigned int order) {} #endif /* CONFIG_DEBUG_PAGEALLOC */ =20 +#ifndef clear_pages +/** + * clear_pages() - clear a page range using a kernel virtual address. + * @addr: start address + * @npages: number of pages + * + * Assumes that (@addr, +@npages) references a kernel region. + * Does absolutely no exception handling. + */ +static inline void clear_pages(void *addr, unsigned int npages) +{ + do { + clear_page(addr); + addr +=3D PAGE_SIZE; + } while (--npages); +} +#endif + +#ifndef clear_user_pages +/** + * clear_user_pages() - clear a page range mapped by the user. + * @addr: kernel mapped address + * @vaddr: user mapped address + * @pg: start page + * @npages: number of pages + * + * Assumes that the region (@addr, +@npages) has been validated + * already so this does no exception handling. + */ +#define clear_user_pages(addr, vaddr, pg, npages) \ +do { \ + clear_user_page(addr, vaddr, pg); \ + addr +=3D PAGE_SIZE; \ + vaddr +=3D PAGE_SIZE; \ + pg++; \ +} while (--npages) +#endif + #ifdef __HAVE_ARCH_GATE_AREA extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); extern int in_gate_area_no_mm(unsigned long addr); --=20 2.43.5