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mm/memory_hotplug: remove is_mem_section_removable()

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Fortunately, all users of is_mem_section_removable() are gone.  Get rid of
it, including some now unnecessary functions.

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Oscar Salvador <osalvador@suse.de>
Link: http://lkml.kernel.org/r/20200407135416.24093-3-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2020-06-04 16:48:31 -07:00 committed by Linus Torvalds
parent ef1b51f773
commit 04f3465c98
2 changed files with 0 additions and 82 deletions
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7
include/linux/memory_hotplug.h
View File

@ -314,19 +314,12 @@ static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
#ifdef CONFIG_MEMORY_HOTREMOVE
extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
extern void try_offline_node(int nid);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern int remove_memory(int nid, u64 start, u64 size);
extern void __remove_memory(int nid, u64 start, u64 size);
#else
static inline bool is_mem_section_removable(unsigned long pfn,
unsigned long nr_pages)
{
return false;
}
static inline void try_offline_node(int nid) {}
static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)

75
mm/memory_hotplug.c
View File

@ -1113,81 +1113,6 @@ int add_memory(int nid, u64 start, u64 size)
EXPORT_SYMBOL_GPL(add_memory);
#ifdef CONFIG_MEMORY_HOTREMOVE
/*
* A free page on the buddy free lists (not the per-cpu lists) has PageBuddy
* set and the size of the free page is given by page_order(). Using this,
* the function determines if the pageblock contains only free pages.
* Due to buddy contraints, a free page at least the size of a pageblock will
* be located at the start of the pageblock
*/
static inline int pageblock_free(struct page *page)
{
return PageBuddy(page) && page_order(page) >= pageblock_order;
}
/* Return the pfn of the start of the next active pageblock after a given pfn */
static unsigned long next_active_pageblock(unsigned long pfn)
{
struct page *page = pfn_to_page(pfn);
/* Ensure the starting page is pageblock-aligned */
BUG_ON(pfn & (pageblock_nr_pages - 1));
/* If the entire pageblock is free, move to the end of free page */
if (pageblock_free(page)) {
int order;
/* be careful. we don't have locks, page_order can be changed.*/
order = page_order(page);
if ((order < MAX_ORDER) && (order >= pageblock_order))
return pfn + (1 << order);
}
return pfn + pageblock_nr_pages;
}
static bool is_pageblock_removable_nolock(unsigned long pfn)
{
struct page *page = pfn_to_page(pfn);
struct zone *zone;
/*
* We have to be careful here because we are iterating over memory
* sections which are not zone aware so we might end up outside of
* the zone but still within the section.
* We have to take care about the node as well. If the node is offline
* its NODE_DATA will be NULL - see page_zone.
*/
if (!node_online(page_to_nid(page)))
return false;
zone = page_zone(page);
pfn = page_to_pfn(page);
if (!zone_spans_pfn(zone, pfn))
return false;
return !has_unmovable_pages(zone, page, MIGRATE_MOVABLE,
MEMORY_OFFLINE);
}
/* Checks if this range of memory is likely to be hot-removable. */
bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
{
unsigned long end_pfn, pfn;
end_pfn = min(start_pfn + nr_pages,
zone_end_pfn(page_zone(pfn_to_page(start_pfn))));
/* Check the starting page of each pageblock within the range */
for (pfn = start_pfn; pfn < end_pfn; pfn = next_active_pageblock(pfn)) {
if (!is_pageblock_removable_nolock(pfn))
return false;
cond_resched();
}
/* All pageblocks in the memory block are likely to be hot-removable */
return true;
}
/*
* Confirm all pages in a range [start, end) belong to the same zone (skipping
* memory holes). When true, return the zone.