mm/page_alloc: correct return value when failing at preparing

If the array passed in is already partially populated, we should return
"nr_populated" even failing at preparing arguments stage.

Link: https://lkml.kernel.org/r/20210713152100.10381-3-mgorman@techsingularity.net
Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Link: https://lore.kernel.org/r/20210709102855.55058-1-yanfei.xu@windriver.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8460971..4d79e35 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5255,7 +5255,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
        gfp &= gfp_allowed_mask;
        alloc_gfp = gfp;
        if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &alloc_gfp, &alloc_flags))
-               return 0;
+               return nr_populated;
        gfp = alloc_gfp;
 
        /* Find an allowed local zone that meets the low watermark. */