Hi David, kernel test robot noticed the following build warnings: [auto build test WARNING on brauner-vfs/vfs.all] [also build test WARNING on linus/master v6.17-rc2 next-20250819] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/David-Disseldorp/gen_init_cpio-write-to-fd-instead-of-stdout-stream/20250819-115406 base: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all patch link: https://lore.kernel.org/r/20250819032607.28727-9-ddiss%40suse.de patch subject: [PATCH v3 8/8] initramfs_test: add filename padding test case config: sparc64-randconfig-r121-20250819 (https://download.01.org/0day-ci/archive/20250820/202508200304.wF1u78il-lkp@xxxxxxxxx/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 93d24b6b7b148c47a2fa228a4ef31524fa1d9f3f) reproduce: (https://download.01.org/0day-ci/archive/20250820/202508200304.wF1u78il-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202508200304.wF1u78il-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> init/initramfs_test.c:415:18: sparse: sparse: Initializer entry defined twice init/initramfs_test.c:425:18: sparse: also defined here vim +415 init/initramfs_test.c 388 389 /* 390 * An initramfs filename is namesize in length, including the zero-terminator. 391 * A filename can be zero-terminated prior to namesize, with the remainder used 392 * as padding. This can be useful for e.g. alignment of file data segments with 393 * a 4KB filesystem block, allowing for extent sharing (reflinks) between cpio 394 * source and destination. This hack works with both GNU cpio and initramfs, as 395 * long as PATH_MAX isn't exceeded. 396 */ 397 static void __init initramfs_test_fname_pad(struct kunit *test) 398 { 399 char *err; 400 size_t len; 401 struct file *file; 402 char fdata[] = "this file data is aligned at 4K in the archive"; 403 struct test_fname_pad { 404 char padded_fname[4096 - CPIO_HDRLEN]; 405 char cpio_srcbuf[CPIO_HDRLEN + PATH_MAX + 3 + sizeof(fdata)]; 406 } *tbufs = kzalloc(sizeof(struct test_fname_pad), GFP_KERNEL); 407 struct initramfs_test_cpio c[] = { { 408 .magic = "070701", 409 .ino = 1, 410 .mode = S_IFREG | 0777, 411 .uid = 0, 412 .gid = 0, 413 .nlink = 1, 414 .mtime = 1, > 415 .filesize = 0, 416 .devmajor = 0, 417 .devminor = 1, 418 .rdevmajor = 0, 419 .rdevminor = 0, 420 /* align file data at 4K archive offset via padded fname */ 421 .namesize = 4096 - CPIO_HDRLEN, 422 .csum = 0, 423 .fname = tbufs->padded_fname, 424 .data = fdata, 425 .filesize = sizeof(fdata), 426 } }; 427 428 memcpy(tbufs->padded_fname, "padded_fname", sizeof("padded_fname")); 429 len = fill_cpio(c, ARRAY_SIZE(c), tbufs->cpio_srcbuf); 430 431 err = unpack_to_rootfs(tbufs->cpio_srcbuf, len); 432 KUNIT_EXPECT_NULL(test, err); 433 434 file = filp_open(c[0].fname, O_RDONLY, 0); 435 if (IS_ERR(file)) { 436 KUNIT_FAIL(test, "open failed"); 437 goto out; 438 } 439 440 /* read back file contents into @cpio_srcbuf and confirm match */ 441 len = kernel_read(file, tbufs->cpio_srcbuf, c[0].filesize, NULL); 442 KUNIT_EXPECT_EQ(test, len, c[0].filesize); 443 KUNIT_EXPECT_MEMEQ(test, tbufs->cpio_srcbuf, c[0].data, len); 444 445 fput(file); 446 KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0); 447 out: 448 kfree(tbufs); 449 } 450 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
