From: Miaohe Lin <linmiaohe@xxxxxxxxxx> Subject: 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fix obsolete comment in free_pcppages_bulk() The second two paragraphs about "all pages pinned" and pages_scanned is obsolete.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@xxxxxxxxxx Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) --- a/mm/page_alloc.c~mm-page_allocc-fix-obsolete-comment-in-free_pcppages_bulk +++ a/mm/page_alloc.c @@ -1428,14 +1428,8 @@ static inline void prefetch_buddy(struct /* * 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) _
