The patch titled
Subject: mm/memory_hotplug.c: cleanup __add_pages()
has been added to the -mm tree. Its filename is
mm-memory_hotplug-cleanup-__add_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-cleanup-__add_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-cleanup-__add_pages.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: 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().
Link: http://lkml.kernel.org/r/20200228095819.10750-3-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Baoquan He <bhe@xxxxxxxxxx>
Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>
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 | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-cleanup-__add_pages
+++ a/mm/memory_hotplug.c
@@ -307,8 +307,9 @@ static int check_hotplug_memory_addressa
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
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();
_
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-cleanup-__add_pages.patch
