The patch titled Subject: mm/memory_hotplug.c: simplify calculation of number of pages in __remove_pages() has been added to the -mm tree. Its filename is mm-memory_hotplug-simplify-calculation-of-number-of-pages-in-__remove_pages.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-simplify-calculation-of-number-of-pages-in-__remove_pages.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-simplify-calculation-of-number-of-pages-in-__remove_pages.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: David Hildenbrand <david@xxxxxxxxxx> Subject: mm/memory_hotplug.c: simplify calculation of number of pages in __remove_pages() In commit 52fb87c81f11 ("mm/memory_hotplug: cleanup __remove_pages()"), we cleaned up __remove_pages(), and introduced a shorter variant to calculate the number of pages to the next section boundary. Turns out we can make this calculation easier to read. We always want to have the number of pages (> 0) to the next section boundary, starting fro= m the current pfn. We'll clean up __remove_pages() in a follow-up patch and directly make use of this computation. Link: http://lkml.kernel.org/r/20200228095819.10750-2-david@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Suggested-by: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> Reviewed-by: Baoquan He <bhe@xxxxxxxxxx> Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory_hotplug.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/mm/memory_hotplug.c~mm-memory_hotplug-simplify-calculation-of-number-of-pages-in-__remove_pages +++ a/mm/memory_hotplug.c @@ -534,7 +534,8 @@ void __remove_pages(unsigned long pfn, u for (; pfn < end_pfn; pfn += cur_nr_pages) { cond_resched(); /* Select all remaining pages up to the next section boundary */ - cur_nr_pages = min(end_pfn - pfn, -(pfn | PAGE_SECTION_MASK)); + cur_nr_pages = min(end_pfn - pfn, + SECTION_ALIGN_UP(pfn + 1) - pfn); __remove_section(pfn, cur_nr_pages, map_offset, altmap); map_offset = 0; } _ Patches currently in -mm which might be from david@xxxxxxxxxx are drivers-base-memoryc-cache-memory-blocks-in-xarray-to-accelerate-lookup-fix.patch drivers-base-memoryc-indicate-all-memory-blocks-as-removable.patch drivers-base-memoryc-drop-section_count.patch drivers-base-memoryc-drop-pages_correctly_probed.patch mm-page_extc-drop-pfn_present-check-when-onlining.patch mm-memory_hotplug-simplify-calculation-of-number-of-pages-in-__remove_pages.patch mm-memory_hotplug-cleanup-__add_pages.patch