[105/262] mm/page_alloc.c: fix obsolete comment in free_pcppages_bulk()

Commit Message

Andrew Morton Nov. 5, 2021, 8:40 p.m. UTC

From: Miaohe Lin <[e-mail]>
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The second two paragraphs about "all pages pinned" and pages_scanned is
obsolete.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/[e-mail]
Signed-off-by: Miaohe Lin <[e-mail]>
Acked-by: Mel Gorman <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephen Rothwell <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/page_alloc.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

Patch

--- 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)