linux-kernel - [PATCH 2/4] mm/page_alloc: correct return value when failing at preparing

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Date:   Tue, 13 Jul 2021 14:56:23 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        Zhang Qiang <Qiang.Zhang@...driver.com>,
        Yanfei Xu <yanfei.xu@...driver.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Matteo Croce <mcroce@...rosoft.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 2/4] mm/page_alloc: correct return value when failing at preparing

From: Yanfei Xu <yanfei.xu@...driver.com>

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

Signed-off-by: Yanfei Xu <yanfei.xu@...driver.com>
Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
Link: https://lore.kernel.org/r/20210709102855.55058-1-yanfei.xu@windriver.com
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6ef86f338151..803414ce9264 100644
--- 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. */
-- 
2.26.2