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X-CSE-ConnectionGUID: Z0L+I1ZDTD2kpUYYioierw== X-CSE-MsgGUID: Shr+jtAxR0e1Af/ftBmfWA== X-IronPort-AV: E=McAfee;i="6800,10657,11713"; a="72299781" X-IronPort-AV: E=Sophos;i="6.21,314,1763452800"; d="scan'208";a="72299781" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2026 02:42:50 -0800 X-CSE-ConnectionGUID: OF+I6fLlQXuu4/3R2netzw== X-CSE-MsgGUID: /ckh7Z2gScKSHmVmlA2Jaw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,314,1763452800"; d="scan'208";a="221864814" Received: from lkp-server02.sh.intel.com (HELO a3936d6a266d) ([10.239.97.151]) by orviesa005.jf.intel.com with ESMTP; 27 Feb 2026 02:42:48 -0800 Received: from kbuild by a3936d6a266d with local (Exim 4.98.2) (envelope-from ) id 1vvvIM-00000000ATR-2xjo; Fri, 27 Feb 2026 10:42:17 +0000 Date: Fri, 27 Feb 2026 18:37:46 +0800 From: kernel test robot To: Ming Lei Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Jens Axboe , Christoph Hellwig , Hannes Reinecke , Nilay Shroff Subject: arch/um/drivers/ubd_kern.c:780:13: warning: stack frame size (2152) exceeds limit (2048) in 'ubd_device_release' Message-ID: <202602271836.PmiiaxiO-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Hi Ming, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a75cb869a8ccc88b0bc7a44e1597d9c7995c56e5 commit: 98e68f67020ce30e1a4d8e2d05d85a453738dfb8 block: prevent adding/deleting disk during updating nr_hw_queues date: 10 months ago config: um-allmodconfig (https://download.01.org/0day-ci/archive/20260227/202602271836.PmiiaxiO-lkp@intel.com/config) compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260227/202602271836.PmiiaxiO-lkp@intel.com/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 | Closes: https://lore.kernel.org/oe-kbuild-all/202602271836.PmiiaxiO-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from arch/um/drivers/ubd_kern.c:26: In file included from include/linux/blkdev.h:9: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:12: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:549:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 549 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:567:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 567 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ In file included from arch/um/drivers/ubd_kern.c:26: In file included from include/linux/blkdev.h:9: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:12: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:585:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 585 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ In file included from arch/um/drivers/ubd_kern.c:26: In file included from include/linux/blkdev.h:9: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:12: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:601:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 601 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:616:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 616 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:631:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 631 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:724:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 724 | readsb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:737:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 737 | readsw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:750:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 750 | readsl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:764:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 764 | writesb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:778:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 778 | writesw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:792:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 792 | writesl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ >> arch/um/drivers/ubd_kern.c:780:13: warning: stack frame size (2152) exceeds limit (2048) in 'ubd_device_release' [-Wframe-larger-than] 780 | static void ubd_device_release(struct device *dev) | ^ 13 warnings generated. vim +/ubd_device_release +780 arch/um/drivers/ubd_kern.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 779 2e3f5251ac7168 Jeff Dike 2007-05-06 @780 static void ubd_device_release(struct device *dev) 2e3f5251ac7168 Jeff Dike 2007-05-06 781 { 5bee35e5389f45 Tiwei Bie 2024-11-05 782 struct ubd *ubd_dev = container_of(dev, struct ubd, pdev.dev); 2e3f5251ac7168 Jeff Dike 2007-05-06 783 4e6da0fe8058df Richard Weinberger 2017-11-26 784 blk_mq_free_tag_set(&ubd_dev->tag_set); 2e3f5251ac7168 Jeff Dike 2007-05-06 785 *ubd_dev = ((struct ubd) DEFAULT_UBD); 2e3f5251ac7168 Jeff Dike 2007-05-06 786 } 2e3f5251ac7168 Jeff Dike 2007-05-06 787 :::::: The code at line 780 was first introduced by commit :::::: 2e3f5251ac716879df6b6271f243f657c6e02e9a uml: drivers get release methods :::::: TO: Jeff Dike :::::: CC: Linus Torvalds -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki