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mm/memory_hotplug.c: cleanup __add_pages() 

Let's drop the basically unused section stuff and simplify.  The logic now
matches the logic in __remove_pages().

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: Segher Boessenkool <segher@kernel.crashing.org>
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/20200228095819.10750-3-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2020-04-06 20:06:56 -07:00 committed by Linus Torvalds
parent a11b941924
commit 6cdd0b30a9
1 changed files with 7 additions and 11 deletions
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18
mm/memory_hotplug.c
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@ -307,8 +307,9 @@ static int check_hotplug_memory_addressable(unsigned long pfn,
int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
struct mhp_restrictions *restrictions)
{
const unsigned long end_pfn = pfn + nr_pages;
unsigned long cur_nr_pages;
int err;
unsigned long nr, start_sec, end_sec;
struct vmem_altmap *altmap = restrictions->altmap;
err = check_hotplug_memory_addressable(pfn, nr_pages);
@ -331,18 +332,13 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
if (err)
return err;
start_sec = pfn_to_section_nr(pfn);
end_sec = pfn_to_section_nr(pfn + nr_pages - 1);
for (nr = start_sec; nr <= end_sec; nr++) {
unsigned long pfns;
pfns = min(nr_pages, PAGES_PER_SECTION
- (pfn & ~PAGE_SECTION_MASK));
err = sparse_add_section(nid, pfn, pfns, altmap);
for (; pfn < end_pfn; pfn += cur_nr_pages) {
/* Select all remaining pages up to the next section boundary */
cur_nr_pages = min(end_pfn - pfn,
SECTION_ALIGN_UP(pfn + 1) - pfn);
err = sparse_add_section(nid, pfn, cur_nr_pages, altmap);
if (err)
break;
pfn += pfns;
nr_pages -= pfns;
cond_resched();
}
vmemmap_populate_print_last();