+ selftests-udmabuf-fix-hugepage-size-calculation.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: selftests: udmabuf: fix hugepage size calculation
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     selftests-udmabuf-fix-hugepage-size-calculation.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-udmabuf-fix-hugepage-size-calculation.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: zishun yi <zishun.yi.dev@gmail.com>
Subject: selftests: udmabuf: fix hugepage size calculation
Date: Sun, 18 Jan 2026 21:51:26 +0800

udmabuf's test 6 and 7 is intended to verify the behavior of 2MB huge
pages migration, but the helper function still calculates the size using
standard (4KB) pages.

Link: https://lkml.kernel.org/r/20260118135126.102472-1-zishun.yi.dev@gmail.com
Signed-off-by: zishun yi <zishun.yi.dev@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/drivers/dma-buf/udmabuf.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c~selftests-udmabuf-fix-hugepage-size-calculation
+++ a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
@@ -69,7 +69,7 @@ static int create_udmabuf_list(int devfd
 	for (i = 0; i < NUM_ENTRIES; i++) {
 		list->list[i].memfd  = memfd;
 		list->list[i].offset = i * (memfd_size / NUM_ENTRIES);
-		list->list[i].size   = getpagesize() * NUM_PAGES;
+		list->list[i].size   = page_size * NUM_PAGES;
 	}
 
 	list->count = NUM_ENTRIES;
@@ -115,8 +115,8 @@ static int compare_chunks(void *addr1, v
 	while (i < NUM_ENTRIES) {
 		off = i * (memfd_size / NUM_ENTRIES);
 		for (j = 0; j < NUM_PAGES; j++, k++) {
-			char1 = *((char *)addr1 + off + (j * getpagesize()));
-			char2 = *((char *)addr2 + (k * getpagesize()));
+			char1 = *((char *)addr1 + off + (j * page_size));
+			char2 = *((char *)addr2 + (k * page_size));
 			if (char1 != char2) {
 				ret = -1;
 				goto err;
@@ -126,7 +126,7 @@ static int compare_chunks(void *addr1, v
 	}
 err:
 	munmap(addr1, memfd_size);
-	munmap(addr2, NUM_ENTRIES * NUM_PAGES * getpagesize());
+	munmap(addr2, NUM_ENTRIES * NUM_PAGES * page_size);
 	return ret;
 }
 
@@ -240,7 +240,7 @@ int main(int argc, char *argv[])
 	addr1 = mmap_fd(memfd, size);
 	write_to_memfd(addr1, size, 'a');
 	buf = create_udmabuf_list(devfd, memfd, size);
-	addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
+	addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * page_size);
 	write_to_memfd(addr1, size, 'b');
 	ret = compare_chunks(addr1, addr2, size);
 	if (ret < 0)
@@ -256,7 +256,7 @@ int main(int argc, char *argv[])
 	size = MEMFD_SIZE * page_size;
 	memfd = create_memfd_with_seals(size, true);
 	buf = create_udmabuf_list(devfd, memfd, size);
-	addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
+	addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * page_size);
 	addr1 = mmap_fd(memfd, size);
 	write_to_memfd(addr1, size, 'a');
 	write_to_memfd(addr1, size, 'b');
_

Patches currently in -mm which might be from zishun.yi.dev@gmail.com are

selftests-udmabuf-fix-hugepage-size-calculation.patch