commit 86ed41792d394f804d2c9e695ac8b257220fbdee
Author: Victor Stinner <vstinner@redhat.com>
Date:   Tue Mar 12 17:17:13 2019 +0100

    Fix test_tarfile on ppc64
    
    Fix sparse file tests of test_tarfile on ppc64le with the tmpfs
    filesystem.
    
    * https://bugzilla.redhat.com/show_bug.cgi?id=1639490
    * https://bugs.python.org/issue35772
    * https://github.com/python/cpython/commit/d1dd6be613381b996b9071443ef081de8e5f3aff

diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
index 4cd7d53..bd8b05f 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -973,16 +973,21 @@ class GNUReadTest(LongnameTest, ReadTest, unittest.TestCase):
     def _fs_supports_holes():
         # Return True if the platform knows the st_blocks stat attribute and
         # uses st_blocks units of 512 bytes, and if the filesystem is able to
-        # store holes in files.
+        # store holes of 4 KiB in files.
+        #
+        # The function returns False if page size is larger than 4 KiB.
+        # For example, ppc64 uses pages of 64 KiB.
         if sys.platform.startswith("linux"):
             # Linux evidentially has 512 byte st_blocks units.
             name = os.path.join(TEMPDIR, "sparse-test")
             with open(name, "wb") as fobj:
+                # Seek to "punch a hole" of 4 KiB
                 fobj.seek(4096)
+                fobj.write(b'x' * 4096)
                 fobj.truncate()
             s = os.stat(name)
             support.unlink(name)
-            return s.st_blocks == 0
+            return (s.st_blocks * 512 < s.st_size)
         else:
             return False