tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git zero-initialize-pmem head: 61c7fc9c24078b799a75566e4102bfe967b05664 commit: 61c7fc9c24078b799a75566e4102bfe967b05664 [453/453] ext4: implement FALLOC_FL_ZEROINIT_RANGE config: powerpc64-randconfig-r016-20210904 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6fe2beba7d2a41964af658c8c59dd172683ef739) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=61c7fc9c24078b799a75566e4102bfe967b05664 git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git git fetch --no-tags djwong-xfs zero-initialize-pmem git checkout 61c7fc9c24078b799a75566e4102bfe967b05664 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ :36:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/ext4/extents.c:22: In file included from include/linux/jbd2.h:23: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ :38:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/ext4/extents.c:22: In file included from include/linux/jbd2.h:23: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ :40:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/ext4/extents.c:22: In file included from include/linux/jbd2.h:23: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ :42:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/ext4/extents.c:22: In file included from include/linux/jbd2.h:23: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ :44:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ >> fs/ext4/extents.c:4519:34: warning: variable 'start' is uninitialized when used here [-Wuninitialized] truncate_pagecache_range(inode, start, end - 1); ^~~~~ fs/ext4/extents.c:4478:14: note: initialize the variable 'start' to silence this warning loff_t start, end; ^ = 0 >> fs/ext4/extents.c:4519:41: warning: variable 'end' is uninitialized when used here [-Wuninitialized] truncate_pagecache_range(inode, start, end - 1); ^~~ fs/ext4/extents.c:4478:19: note: initialize the variable 'end' to silence this warning loff_t start, end; ^ = 0 14 warnings generated. vim +/start +4519 fs/ext4/extents.c 4473 4474 static long ext4_zeroinit_range(struct file *file, loff_t offset, loff_t len) 4475 { 4476 struct inode *inode = file_inode(file); 4477 handle_t *handle = NULL; 4478 loff_t start, end; 4479 long ret; 4480 4481 trace_ext4_zeroinit_range(inode, offset, len, 4482 FALLOC_FL_ZEROINIT_RANGE | FALLOC_FL_KEEP_SIZE); 4483 4484 /* We don't support data=journal mode */ 4485 if (ext4_should_journal_data(inode)) 4486 return -EOPNOTSUPP; 4487 4488 inode_lock(inode); 4489 4490 /* 4491 * Indirect files do not support unwritten extents 4492 */ 4493 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { 4494 ret = -EOPNOTSUPP; 4495 goto out_mutex; 4496 } 4497 4498 /* Wait all existing dio workers, newcomers will block on i_mutex */ 4499 inode_dio_wait(inode); 4500 4501 /* 4502 * Prevent page faults from reinstantiating pages we have released from 4503 * page cache. 4504 */ 4505 down_write(&EXT4_I(inode)->i_mmap_sem); 4506 4507 ret = ext4_break_layouts(inode); 4508 if (ret) { 4509 up_write(&EXT4_I(inode)->i_mmap_sem); 4510 goto out_mutex; 4511 } 4512 4513 ret = ext4_update_disksize_before_punch(inode, offset, len); 4514 if (ret) { 4515 up_write(&EXT4_I(inode)->i_mmap_sem); 4516 goto out_mutex; 4517 } 4518 /* Now release the pages and zero block aligned part of pages */ > 4519 truncate_pagecache_range(inode, start, end - 1); 4520 inode->i_mtime = inode->i_ctime = current_time(inode); 4521 4522 if (IS_DAX(inode)) 4523 ret = dax_zeroinit_range(inode, offset, len, 4524 &ext4_iomap_report_ops); 4525 else 4526 ret = iomap_zeroout_range(inode, offset, len, 4527 &ext4_iomap_report_ops); 4528 if (ret == -ECANCELED) 4529 ret = -EOPNOTSUPP; 4530 up_write(&EXT4_I(inode)->i_mmap_sem); 4531 if (ret) 4532 goto out_mutex; 4533 4534 /* 4535 * In worst case we have to writeout two nonadjacent unwritten 4536 * blocks and update the inode 4537 */ 4538 handle = ext4_journal_start(inode, EXT4_HT_MISC, 1); 4539 if (IS_ERR(handle)) { 4540 ret = PTR_ERR(handle); 4541 ext4_std_error(inode->i_sb, ret); 4542 goto out_mutex; 4543 } 4544 4545 inode->i_mtime = inode->i_ctime = current_time(inode); 4546 ret = ext4_mark_inode_dirty(handle, inode); 4547 if (unlikely(ret)) 4548 goto out_handle; 4549 ext4_fc_track_range(handle, inode, offset >> inode->i_sb->s_blocksize_bits, 4550 (offset + len - 1) >> inode->i_sb->s_blocksize_bits); 4551 ext4_update_inode_fsync_trans(handle, inode, 1); 4552 4553 if (file->f_flags & O_SYNC) 4554 ext4_handle_sync(handle); 4555 4556 out_handle: 4557 ext4_journal_stop(handle); 4558 out_mutex: 4559 inode_unlock(inode); 4560 return ret; 4561 } 4562 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org