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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 *zone, struct page *page, >> unsigned int order) {} >> #endif /* CONFIG_DEBUG_PAGEALLOC */ >> +#ifndef ARCH_PAGE_CONTIG_NR >> +#define PAGE_CONTIG_NR 1 >> +#else >> +#define PAGE_CONTIG_NR ARCH_PAGE_CONTIG_NR >> +#endif >> + > > These likely don't belong into this aptch :) Yeah :). >> +#ifndef clear_pages >> +/* > > /** > > for proper kernel doc > >> + * 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 = 0; i < npages; i++) >> + clear_page(addr + i * PAGE_SIZE); > > If we know that we will clear at least one page (which we can document) > > do { > clear_page(addr); > addr += PAGE_SIZE; > } while (--npages); > > Similarly for the case below. Ack. Though how about the following instead? Slightly less clear but probably better suited for caching the likely access pattern. addr += (npages - 1) * PAGE_SIZE; do { clear_page(addr); addr -= PAGE_SIZE; } while (--npages); >> +} >> +#endif >> + >> +#ifndef clear_user_pages > > Can we add kernel doc here as well? Will do. Thanks for the quick reviews. -- ankur