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From:   Breno Leitao <leitao@debian.org>
To:     mike.kravetz@oracle.com, muchun.song@linux.dev,
        akpm@linux-foundation.org, Shuah Khan <shuah@kernel.org>
Cc:     linux-mm@kvack.org, riel@surriel.com,
        linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK),
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 1/2] selftests/mm: export get_free_hugepages()
Date:   Wed,  4 Oct 2023 10:11:25 -0700
Message-Id: <20231004171127.106056-1-leitao@debian.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

get_free_hugepages() is helpful for other hugepage tests. Export it to
the common file (vm_util.c) to be reused.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 tools/testing/selftests/mm/hugetlb-madvise.c | 19 -------------------
 tools/testing/selftests/mm/vm_util.c         | 19 +++++++++++++++++++
 tools/testing/selftests/mm/vm_util.h         |  1 +
 3 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/tools/testing/selftests/mm/hugetlb-madvise.c b/tools/testing/selftests/mm/hugetlb-madvise.c
index d55322df4b73..f32d99565c5e 100644
--- a/tools/testing/selftests/mm/hugetlb-madvise.c
+++ b/tools/testing/selftests/mm/hugetlb-madvise.c
@@ -36,25 +36,6 @@
 unsigned long huge_page_size;
 unsigned long base_page_size;
 
-unsigned long get_free_hugepages(void)
-{
-	unsigned long fhp = 0;
-	char *line = NULL;
-	size_t linelen = 0;
-	FILE *f = fopen("/proc/meminfo", "r");
-
-	if (!f)
-		return fhp;
-	while (getline(&line, &linelen, f) > 0) {
-		if (sscanf(line, "HugePages_Free:      %lu", &fhp) == 1)
-			break;
-	}
-
-	free(line);
-	fclose(f);
-	return fhp;
-}
-
 void write_fault_pages(void *addr, unsigned long nr_pages)
 {
 	unsigned long i;
diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c
index 558c9cd8901c..3082b40492dd 100644
--- a/tools/testing/selftests/mm/vm_util.c
+++ b/tools/testing/selftests/mm/vm_util.c
@@ -269,3 +269,22 @@ int uffd_unregister(int uffd, void *addr, uint64_t len)
 
 	return ret;
 }
+
+unsigned long get_free_hugepages(void)
+{
+	unsigned long fhp = 0;
+	char *line = NULL;
+	size_t linelen = 0;
+	FILE *f = fopen("/proc/meminfo", "r");
+
+	if (!f)
+		return fhp;
+	while (getline(&line, &linelen, f) > 0) {
+		if (sscanf(line, "HugePages_Free:      %lu", &fhp) == 1)
+			break;
+	}
+
+	free(line);
+	fclose(f);
+	return fhp;
+}
diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
index c7fa61f0dff8..c02990bbd56f 100644
--- a/tools/testing/selftests/mm/vm_util.h
+++ b/tools/testing/selftests/mm/vm_util.h
@@ -51,6 +51,7 @@ int uffd_register(int uffd, void *addr, uint64_t len,
 int uffd_unregister(int uffd, void *addr, uint64_t len);
 int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
 			      bool miss, bool wp, bool minor, uint64_t *ioctls);
+unsigned long get_free_hugepages(void);
 
 /*
  * On ppc64 this will only work with radix 2M hugepage size
-- 
2.34.1