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Message-ID: <202512141455.Q3mvffdN-lkp@intel.com>
Date: Sun, 14 Dec 2025 15:04:33 +0800
From: kernel test robot <lkp@...el.com>
To: Ming Lei <ming.lei@...hat.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
Nilay Shroff <nilay@...ux.ibm.com>
Subject: arch/um/drivers/ubd_kern.c:780:13: warning: stack frame size (2152)
exceeds limit (2048) in 'ubd_device_release'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
commit: 98e68f67020ce30e1a4d8e2d05d85a453738dfb8 block: prevent adding/deleting disk during updating nr_hw_queues
date: 7 months ago
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20251214/202512141455.Q3mvffdN-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/20251214/202512141455.Q3mvffdN-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 <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512141455.Q3mvffdN-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 <jdike@...toit.com>
:::::: CC: Linus Torvalds <torvalds@...dy.linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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