linux-kernel - [PATCH] selftests/vm: update hugetlb madvise

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Date:   Thu,  3 Nov 2022 18:16:32 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        oe-lkp@...ts.linux.dev, lkp@...el.com
Cc:     Rik van Riel <riel@...riel.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        kernel test robot <oliver.sang@...el.com>
Subject: [PATCH] selftests/vm: update hugetlb madvise

Commit 8ebe0a5eaaeb ("mm,madvise,hugetlb: fix unexpected data loss
with MADV_DONTNEED on hugetlbfs") changed how the passed length was
interpreted for hugetlb mappings.  It was changed from align up to
align down.  The hugetlb-madvise test explicitly tests this behavior.
Change test to expect new behavior.

Reported-by: kernel test robot <oliver.sang@...el.com>
Link: https://lore.kernel.org/oe-lkp/202211040619.2ec447d7-oliver.sang@intel.com
Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 tools/testing/selftests/vm/hugetlb-madvise.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/vm/hugetlb-madvise.c b/tools/testing/selftests/vm/hugetlb-madvise.c
index f96435b70986..a634f47d1e56 100644
--- a/tools/testing/selftests/vm/hugetlb-madvise.c
+++ b/tools/testing/selftests/vm/hugetlb-madvise.c
@@ -195,7 +195,7 @@ int main(int argc, char **argv)
 			exit(1);
 	}
 
-	/* addr + length should be aligned up to huge page size */
+	/* addr + length should be aligned down to huge page size */
 	if (madvise(addr,
 			((NR_HUGE_PAGES - 1) * huge_page_size) + base_page_size,
 			MADV_DONTNEED)) {
@@ -203,10 +203,11 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
-	/* should free all pages in mapping */
-	validate_free_pages(free_hugepages);
+	/* should free all but last page in mapping */
+	validate_free_pages(free_hugepages - 1);
 
 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
+	validate_free_pages(free_hugepages);
 
 	/*
 	 * Test MADV_DONTNEED on anonymous private mapping
-- 
2.37.3