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mm/memory_hotplug: simplify online_pages_range()

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online_pages always corresponds to nr_pages.  Simplify the code, getting
rid of online_pages_blocks().  Add some comments.

Link: http://lkml.kernel.org/r/20190814154109.3448-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Arun KS <arunks@codeaurora.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Nadav Amit <namit@vmware.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2019-09-23 15:36:02 -07:00 • committed by Linus Torvalds
parent 5ecae6359e
commit b2c2ab208e
1 changed files with 16 additions and 20 deletions
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36
mm/memory_hotplug.c
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@ -632,31 +632,27 @@ static void generic_online_page(struct page *page, unsigned int order)
#endif #endif
} }
static int online_pages_blocks(unsigned long start, unsigned long nr_pages)
{
unsigned long end = start + nr_pages;
int order, onlined_pages = 0;
while (start < end) {
order = min(MAX_ORDER - 1,
get_order(PFN_PHYS(end) - PFN_PHYS(start)));
(*online_page_callback)(pfn_to_page(start), order);
onlined_pages += (1UL << order);
start += (1UL << order);
}
return onlined_pages;
}
static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg) void *arg)
{ {
unsigned long onlined_pages = *(unsigned long *)arg; const unsigned long end_pfn = start_pfn + nr_pages;
unsigned long pfn;
int order;
onlined_pages += online_pages_blocks(start_pfn, nr_pages); /*
online_mem_sections(start_pfn, start_pfn + nr_pages); * Online the pages. The callback might decide to keep some pages
* PG_reserved (to add them to the buddy later), but we still account
* them as being online/belonging to this zone ("present").
*/
for (pfn = start_pfn; pfn < end_pfn; pfn += 1ul << order) {
order = min(MAX_ORDER - 1, get_order(PFN_PHYS(end_pfn - pfn)));
(*online_page_callback)(pfn_to_page(pfn), order);
}
*(unsigned long *)arg = onlined_pages; /* mark all involved sections as online */
online_mem_sections(start_pfn, end_pfn);
*(unsigned long *)arg += nr_pages;
return 0; return 0;
} }