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writes: > David Hildenbrand writes: > >> On 02.09.25 10:08, Ankur Arora wrote: [ ... ] >>> + * 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); Decided against using this reverse access pattern. I would need to replicate it at three places (clear_pages(), clear_user_pages() and clear_highpages()) and this kind of policy should probably be dictated from folio_zero_user() or clear_contig_pages() etc. -- ankur