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In absence of architectural primitives, these just do straight clearing sequentially. Signed-off-by: Ankur Arora --- include/linux/mm.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1ae97a0b8ec7..b8c3f265b497 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3768,6 +3768,38 @@ static inline void clear_page_guard(struct zone *zon= e, struct page *page, unsigned int order) {} #endif /* CONFIG_DEBUG_PAGEALLOC */ =20 +#ifndef ARCH_PAGE_CONTIG_NR +#define PAGE_CONTIG_NR 1 +#else +#define PAGE_CONTIG_NR ARCH_PAGE_CONTIG_NR +#endif + +#ifndef clear_pages +/* + * clear_pages() - clear kernel page range. + * @addr: start address of page range + * @npages: number of pages + * + * Assumes that (@addr, +@npages) references a kernel region. + * Like clear_page(), this does absolutely no exception handling. + */ +static inline void clear_pages(void *addr, unsigned int npages) +{ + for (int i =3D 0; i < npages; i++) + clear_page(addr + i * PAGE_SIZE); +} +#endif + +#ifndef clear_user_pages +static inline void clear_user_pages(void *addr, unsigned long vaddr, + struct page *pg, unsigned int npages) +{ + for (int i =3D 0; i < npages; i++) + clear_user_page(addr + i * PAGE_SIZE, + vaddr + i * PAGE_SIZE, pg + i); +} +#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 2.31.1