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17.09.25 17:24, Ankur Arora wrote: >> For configurations with CONFIG_MMU we do not define clear_user_page(). >> This runs into issues for configurations with !CONFIG_HIGHMEM, because >> clear_user_highpages() expects to clear_user_page() (via a default >> version of clear_user_pages()). > > I'm confused. Can you elaborate once more why we cannot take care of that in > common code? So my definition of clear_user_highpages, +#ifndef clear_user_highpages +static inline void clear_user_highpages(struct page *page, unsigned long vaddr, + unsigned int npages) +{ + if (!IS_ENABLED(CONFIG_HIGHMEM)) { + void *base = page_address(page); + clear_user_pages(base, vaddr, page, npages); + return; + } + + do { + clear_user_highpage(page, vaddr); + vaddr += PAGE_SIZE; + page++; + } while (--npages); +} +#endif assumes one of the following: 1. clear_user_highpages is defined by the architecture or, 2. HIGHMEM => arch defines clear_user_highpage or clear_user_page 3. !HIGHMEM => arch defines clear_user_pages or clear_user_page Case 2 is fine, since ARM has clear_user_highpage(). Case 3 runs into a problem since ARM doesn't have clear_user_pages() or clear_user_page() (it does have the second, but only with !CONFIG_MMU). > If it's about clear_user_pages(), then you can just switch from > !IS_ENABLED(CONFIG_HIGHMEM) to ifdef in patch #11. It's worse than just clear_user_pages(), since we will have clear_user_pages() (due to the defintion in patch-10) but that is broken since the arch doesn't define clear_user_page(). I think the fallback defintions of clear_user_highpages() and clear_user_pages() are reasonably sane so this needs to be addressed in the arch code. I defined clear_user_highpages() since it already has clear_user_highpage(). Another solution might be to define clear_user_page() for ARM which would also address the broken-ness of clear_user_pages() but that is more intrusive since that needs actual knowledge of the ARM mapping model(s). -- ankur