tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 9cdbf6467424045617cd6e79dcaad06bb8efa31c commit: de881df97768d07b342cbd1f8359b832afccace9 f2fs: support zone capacity less than zone size date: 7 months ago config: powerpc-randconfig-r011-20210417 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project f549176ad976caa3e19edd036df9a7e12770af7c) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout de881df97768d07b342cbd1f8359b832afccace9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from arch/powerpc/include/asm/io.h:604: 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:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:193:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:542:56: 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/f2fs/super.c:12: 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:10: 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:604: 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:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:195:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:543:56: 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/f2fs/super.c:12: 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:10: 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:604: 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:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:197:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:544:58: 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/f2fs/super.c:12: 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:10: 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:604: 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:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:199:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:545:58: 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/f2fs/super.c:12: 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:10: 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:604: 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:601:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:201:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ fs/f2fs/super.c:3419:12: warning: stack frame size of 2704 bytes in function 'f2fs_fill_super' [-Wframe-larger-than=] static int f2fs_fill_super(struct super_block *sb, void *data, int silent) ^ static int f2fs_scan_devices(struct f2fs_sb_info *sbi) ^ 14 warnings generated. vim +/f2fs_scan_devices +3266 fs/f2fs/super.c 26d815ad75156a Jaegeuk Kim 2015-04-20 3265 3c62be17d4f562 Jaegeuk Kim 2016-10-06 @3266 static int f2fs_scan_devices(struct f2fs_sb_info *sbi) 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3267 { 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3268 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); 7bb3a371d19915 Masato Suzuki 2017-02-27 3269 unsigned int max_devices = MAX_DEVICES; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3270 int i; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3271 7bb3a371d19915 Masato Suzuki 2017-02-27 3272 /* Initialize single device information */ 7bb3a371d19915 Masato Suzuki 2017-02-27 3273 if (!RDEV(0).path[0]) { 7bb3a371d19915 Masato Suzuki 2017-02-27 3274 if (!bdev_is_zoned(sbi->sb->s_bdev)) 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3275 return 0; 7bb3a371d19915 Masato Suzuki 2017-02-27 3276 max_devices = 1; 7bb3a371d19915 Masato Suzuki 2017-02-27 3277 } 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3278 7bb3a371d19915 Masato Suzuki 2017-02-27 3279 /* 7bb3a371d19915 Masato Suzuki 2017-02-27 3280 * Initialize multiple devices information, or single 7bb3a371d19915 Masato Suzuki 2017-02-27 3281 * zoned block device information. 7bb3a371d19915 Masato Suzuki 2017-02-27 3282 */ 026f05079b00a5 Kees Cook 2018-06-12 3283 sbi->devs = f2fs_kzalloc(sbi, 026f05079b00a5 Kees Cook 2018-06-12 3284 array_size(max_devices, 026f05079b00a5 Kees Cook 2018-06-12 3285 sizeof(struct f2fs_dev_info)), 026f05079b00a5 Kees Cook 2018-06-12 3286 GFP_KERNEL); 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3287 if (!sbi->devs) 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3288 return -ENOMEM; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3289 7bb3a371d19915 Masato Suzuki 2017-02-27 3290 for (i = 0; i < max_devices; i++) { 7bb3a371d19915 Masato Suzuki 2017-02-27 3291 7bb3a371d19915 Masato Suzuki 2017-02-27 3292 if (i > 0 && !RDEV(i).path[0]) 7bb3a371d19915 Masato Suzuki 2017-02-27 3293 break; 7bb3a371d19915 Masato Suzuki 2017-02-27 3294 7bb3a371d19915 Masato Suzuki 2017-02-27 3295 if (max_devices == 1) { 7bb3a371d19915 Masato Suzuki 2017-02-27 3296 /* Single zoned block device mount */ 7bb3a371d19915 Masato Suzuki 2017-02-27 3297 FDEV(0).bdev = 7bb3a371d19915 Masato Suzuki 2017-02-27 3298 blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev, 7bb3a371d19915 Masato Suzuki 2017-02-27 3299 sbi->sb->s_mode, sbi->sb->s_type); 7bb3a371d19915 Masato Suzuki 2017-02-27 3300 } else { 7bb3a371d19915 Masato Suzuki 2017-02-27 3301 /* Multi-device mount */ 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3302 memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN); 7bb3a371d19915 Masato Suzuki 2017-02-27 3303 FDEV(i).total_segments = 7bb3a371d19915 Masato Suzuki 2017-02-27 3304 le32_to_cpu(RDEV(i).total_segments); 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3305 if (i == 0) { 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3306 FDEV(i).start_blk = 0; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3307 FDEV(i).end_blk = FDEV(i).start_blk + 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3308 (FDEV(i).total_segments << 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3309 sbi->log_blocks_per_seg) - 1 + 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3310 le32_to_cpu(raw_super->segment0_blkaddr); 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3311 } else { 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3312 FDEV(i).start_blk = FDEV(i - 1).end_blk + 1; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3313 FDEV(i).end_blk = FDEV(i).start_blk + 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3314 (FDEV(i).total_segments << 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3315 sbi->log_blocks_per_seg) - 1; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3316 } 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3317 FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path, 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3318 sbi->sb->s_mode, sbi->sb->s_type); 7bb3a371d19915 Masato Suzuki 2017-02-27 3319 } 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3320 if (IS_ERR(FDEV(i).bdev)) 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3321 return PTR_ERR(FDEV(i).bdev); 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3322 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3323 /* to release errored devices */ 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3324 sbi->s_ndevs = i + 1; 3c62be17d4f562 Jaegeuk Kim 2016-10-06 3325 :::::: The code at line 3266 was first introduced by commit :::::: 3c62be17d4f562f43fe1d03b48194399caa35aa5 f2fs: support multiple devices :::::: TO: Jaegeuk Kim <jaegeuk(a)kernel.org&gt; :::::: CC: Jaegeuk Kim <jaegeuk(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org