linux-kernel - [PATCH] tools/vm/page-types.c: fix "kpagecount returned fewer pages than expected" failures

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Date:   Tue,  4 Dec 2018 14:24:29 -0800
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, chansen3@...co.com,
        n-horiguchi@...jp.nec.com, vbabka@...e.cz, willy@...radead.org,
        rientjes@...gle.com
Subject: [PATCH] tools/vm/page-types.c: fix "kpagecount returned fewer pages than expected" failures

Because kpagecount_read() fakes success if map counts are not being
collected, clamp the page count passed to it by walk_pfn() to the pages
value returned by the preceding call to kpageflags_read().

Fixes: 7f1d23e60718 ("tools/vm/page-types.c: include shared map counts")
Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 tools/vm/page-types.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 37908a83ddc2..1ff3a6c0367b 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -701,7 +701,7 @@ static void walk_pfn(unsigned long voffset,
 		if (kpagecgroup_read(cgi, index, pages) != pages)
 			fatal("kpagecgroup returned fewer pages than expected");
 
-		if (kpagecount_read(cnt, index, batch) != pages)
+		if (kpagecount_read(cnt, index, pages) != pages)
 			fatal("kpagecount returned fewer pages than expected");
 
 		for (i = 0; i < pages; i++)
-- 
1.8.3.1