linux-kernel - [PATCH v3] selftests/mm: Convert page

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Message-ID: <20250403101345.29226-1-siddarthsgml@gmail.com>
Date: Thu,  3 Apr 2025 15:43:45 +0530
From: Siddarth G <siddarthsgml@...il.com>
To: shuah@...nel.org
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org,
	Siddarth G <siddarthsgml@...il.com>,
	David Binderman <dcb314@...mail.com>
Subject: [PATCH v3] selftests/mm: Convert page_size to unsigned long

Cppcheck warning:
int result is assigned to long long variable. If the variable is long long
to avoid loss of information, then you have loss of information.

This patch changes the type of page_size from 'unsigned int' to
'unsigned long' instead of using ULL suffixes. Changing hpage_size to
'unsigned long' was considered, but since gethugepage() expects an int,
this change was avoided.

Reported-by: David Binderman <dcb314@...mail.com>
Closes: https://lore.kernel.org/all/AS8PR02MB10217315060BBFDB21F19643E9CA62@AS8PR02MB10217.eurprd02.prod.outlook.com/

Signed-off-by: Siddarth G <siddarthsgml@...il.com>
---
Changes since v2:
- v2 had conflict with current mainline, so this is a fresh patch

 tools/testing/selftests/mm/pagemap_ioctl.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c
index 57b4bba2b45f..fe5ae8b25ff6 100644
--- a/tools/testing/selftests/mm/pagemap_ioctl.c
+++ b/tools/testing/selftests/mm/pagemap_ioctl.c
@@ -34,7 +34,7 @@
 #define PAGEMAP "/proc/self/pagemap"
 int pagemap_fd;
 int uffd;
-unsigned int page_size;
+unsigned long page_size;
 unsigned int hpage_size;
 const char *progname;
 
@@ -184,7 +184,7 @@ void *gethugetlb_mem(int size, int *shmid)
 
 int userfaultfd_tests(void)
 {
-	int mem_size, vec_size, written, num_pages = 16;
+	long mem_size, vec_size, written, num_pages = 16;
 	char *mem, *vec;
 
 	mem_size = num_pages * page_size;
@@ -213,7 +213,7 @@ int userfaultfd_tests(void)
 	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
 				vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
 	if (written < 0)
-		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+		ksft_exit_fail_msg("error %ld %d %s\n", written, errno, strerror(errno));
 
 	ksft_test_result(written == 0, "%s all new pages must not be written (dirty)\n", __func__);
 
@@ -995,7 +995,7 @@ int unmapped_region_tests(void)
 {
 	void *start = (void *)0x10000000;
 	int written, len = 0x00040000;
-	int vec_size = len / page_size;
+	long vec_size = len / page_size;
 	struct page_region *vec = malloc(sizeof(struct page_region) * vec_size);
 
 	/* 1. Get written pages */
@@ -1051,7 +1051,7 @@ static void test_simple(void)
 int sanity_tests(void)
 {
 	unsigned long long mem_size, vec_size;
-	int ret, fd, i, buf_size;
+	long ret, fd, i, buf_size;
 	struct page_region *vec;
 	char *mem, *fmem;
 	struct stat sbuf;
@@ -1160,7 +1160,7 @@ int sanity_tests(void)
 
 	ret = stat(progname, &sbuf);
 	if (ret < 0)
-		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+		ksft_exit_fail_msg("error %ld %d %s\n", ret, errno, strerror(errno));
 
 	fmem = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	if (fmem == MAP_FAILED)
-- 
2.43.0