Commit 7cba630b authored Nov 05, 2021 by Miaohe Lin Committed by Linus Torvalds Nov 06, 2021

mm/page_alloc.c: fix obsolete comment in free_pcppages_bulk()

The second two paragraphs about "all pages pinned" and pages_scanned is
obsolete.  And There are PAGE_ALLOC_COSTLY_ORDER + 1 + NR_PCP_THP orders
in pcp.  So the same order assumption is not held now.

Link: https://lkml.kernel.org/r/20210902121242.41607-4-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent ff7ed9e4

mm/page_alloc.c

+1 −7

Original line number	Diff line number	Diff line
		@@ -1428,14 +1428,8 @@ static inline void prefetch_buddy(struct page *page)

		/*
		* Frees a number of pages from the PCP lists
		* Assumes all pages on list are in same zone, and of same order.
		* Assumes all pages on list are in same zone.
		* count is the number of pages to free.
		*
		* If the zone was previously in an "all pages pinned" state then look to
		* see if this freeing clears that state.
		*
		* And clear the zone's pages_scanned counter, to hold off the "all pages are
		* pinned" detection logic.
		*/
		static void free_pcppages_bulk(struct zone *zone, int count,
		struct per_cpu_pages *pcp)