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authorDavid Hildenbrand <david@redhat.com>2020-04-07 06:06:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 20:43:40 +0300
commita11b9419243b9c5c7c5778d623926d9a12f68d15 (patch)
tree2af23e6685ae6368dab99a419a7272df3ee59299 /mm
parentf3cd4c865b8ad61ff6dc61feba759a98ca06f039 (diff)
downloadlinux-a11b9419243b9c5c7c5778d623926d9a12f68d15.tar.xz
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 from the current pfn. We'll clean up __remove_pages() in a follow-up patch and directly make use of this computation. Suggested-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Baoquan He <bhe@redhat.com> Reviewed-by: Wei Yang <richard.weiyang@gmail.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: Dan Williams <dan.j.williams@intel.com> Link: http://lkml.kernel.org/r/20200228095819.10750-2-david@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index d6f813cc12c1..df748b783418 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -534,7 +534,8 @@ void __remove_pages(unsigned long pfn, unsigned long nr_pages,
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;
}