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C3AUc4nrnTmJA41yD9bXtBm9X1uczZ2Q6PJ0ZojhZHCNgqT8GWbtdmBn3d5wCidDFE1YHHDVGOTR8Q5QejECJR8By+F/GXtPG2Ks7fTCNzIizOEuwt9eWqZLW8ajSUdHN+zyw X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: David Hildenbrand writes: > On 23.09.25 22:34, Ankur Arora wrote: >> David Hildenbrand writes: >> >>> On 17.09.25 17:24, Ankur Arora wrote: >>>> Define clear_user_highpages() which clears pages sequentially using >>>> the single page variant. >>>> With !CONFIG_HIGHMEM, pages are contiguous so use the range clearing >>>> primitive clear_user_pages(). >>>> Signed-off-by: Ankur Arora >>>> --- >>>> include/linux/highmem.h | 18 ++++++++++++++++++ >>>> 1 file changed, 18 insertions(+) >>>> diff --git a/include/linux/highmem.h b/include/linux/highmem.h >>>> index 6234f316468c..ed609987e24d 100644 >>>> --- a/include/linux/highmem.h >>>> +++ b/include/linux/highmem.h >>>> @@ -207,6 +207,24 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) >>>> } >>>> #endif >>>> +#ifndef clear_user_highpages >>> >>> Maybe we can add a simple kernel doc that points at the doc of clear_user_pages, >>> but makes it clear that this for pages that might reside in highmem. >> Didn't add one because clear_user_highpage() didn't have one. Will add >> for both. >> > > Doesn't have to be excessive. But even I have to keep reminding myself when to > use clear_page(), clear_user_page(), clear_user_highpage() ... And now all the multi-page variants. Really motivates the removal of the HIGHMEM stuff. >>>> +static inline void clear_user_highpages(struct page *page, unsigned long vaddr, >>>> + unsigned int npages) >>>> +{ >>>> + if (!IS_ENABLED(CONFIG_HIGHMEM)) { >>>> + clear_user_pages(base, vaddr, page, npages); >>> >>> Single line should work >>> >>> clear_user_pages(page_address(page), vaddr, page, npages); >> Unfortunately not. The problem is that I'm defining the fallback version >> of clear_user_pages() as a macro in the previous patch. > > Yet another sign that we have to fix that instead. :) Yeah :). Thanks -- ankur