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authorDavid Hildenbrand <david@redhat.com>2020-01-30 22:14:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 10:30:38 -0800
commitfe4c86c916d9151113372369f322e7436167e6f3 (patch)
treea0424bc5bc800fe068fc390fd8f367c178e9bc33 /mm
parent3f9903b9ca5e981b5862d7b10086d0e8caa20298 (diff)
mm: remove "count" parameter from has_unmovable_pages()
Now that the memory isolate notifier is gone, the parameter is always 0. Drop it and cleanup has_unmovable_pages(). Link: http://lkml.kernel.org/r/20191114131911.11783-3-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: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Qian Cai <cai@lca.pw> Cc: Pingfan Liu <kernelfans@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Cc: Alexander Potapenko <glider@google.com> Cc: Arun KS <arunks@codeaurora.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c2
-rw-r--r--mm/page_alloc.c21
-rw-r--r--mm/page_isolation.c2
3 files changed, 9 insertions, 16 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0ddff29079c3..c3dc6b27fd6d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1182,7 +1182,7 @@ static bool is_pageblock_removable_nolock(unsigned long pfn)
if (!zone_spans_pfn(zone, pfn))
return false;
- return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE,
+ return !has_unmovable_pages(zone, page, MIGRATE_MOVABLE,
MEMORY_OFFLINE);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fe8a529f7fd8..3aec60ddd6d6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8180,17 +8180,15 @@ void *__init alloc_large_system_hash(const char *tablename,
/*
* This function checks whether pageblock includes unmovable pages or not.
- * If @count is not zero, it is okay to include less @count unmovable pages
*
* PageLRU check without isolation or lru_lock could race so that
* MIGRATE_MOVABLE block might include unmovable pages. And __PageMovable
* check without lock_page also may miss some movable non-lru pages at
* race condition. So you can't expect this function should be exact.
*/
-bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
- int migratetype, int flags)
+bool has_unmovable_pages(struct zone *zone, struct page *page, int migratetype,
+ int flags)
{
- unsigned long found;
unsigned long iter = 0;
unsigned long pfn = page_to_pfn(page);
const char *reason = "unmovable page";
@@ -8216,13 +8214,11 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
goto unmovable;
}
- for (found = 0; iter < pageblock_nr_pages; iter++) {
- unsigned long check = pfn + iter;
-
- if (!pfn_valid_within(check))
+ for (; iter < pageblock_nr_pages; iter++) {
+ if (!pfn_valid_within(pfn + iter))
continue;
- page = pfn_to_page(check);
+ page = pfn_to_page(pfn + iter);
if (PageReserved(page))
goto unmovable;
@@ -8271,11 +8267,9 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
if ((flags & MEMORY_OFFLINE) && PageHWPoison(page))
continue;
- if (__PageMovable(page))
+ if (__PageMovable(page) || PageLRU(page))
continue;
- if (!PageLRU(page))
- found++;
/*
* If there are RECLAIMABLE pages, we need to check
* it. But now, memory offline itself doesn't call
@@ -8289,8 +8283,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
* is set to both of a memory hole page and a _used_ kernel
* page at boot.
*/
- if (found > count)
- goto unmovable;
+ goto unmovable;
}
return false;
unmovable:
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 21af88b718aa..1f8b9dfecbe8 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -37,7 +37,7 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
* FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
* We just check MOVABLE pages.
*/
- if (!has_unmovable_pages(zone, page, 0, migratetype, isol_flags)) {
+ if (!has_unmovable_pages(zone, page, migratetype, isol_flags)) {
unsigned long nr_pages;
int mt = get_pageblock_migratetype(page);