Re: [PATCH v2 4/7] iommufd: Add IOMMU_OPTION_SW_MSI_START/SIZE ioctls

kernel test robot
2025-10-15T11:58:41Z

Hi Nicolin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on shuah-kselftest/next]
[also build test WARNING on shuah-kselftest/fixes linus/master v6.18-rc1 next-20251014]
[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/Nicolin-Chen/iommufd-device-Move-sw_msi_start-from-igroup-to-idev/20251015-083453
base: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
patch link: https://lore.kernel.org/r/6c36de14b00a3f06df3a602f18baf6b51fde429f.1760487869.git.nicolinc%40nvidia.com
patch subject: [PATCH v2 4/7] iommufd: Add IOMMU_OPTION_SW_MSI_START/SIZE ioctls
config: i386-buildonly-randconfig-002-20251015 (https://download.01.org/0day-ci/archive/20251015/202510151909.E0Zb31Ah-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510151909.E0Zb31Ah-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510151909.E0Zb31Ah-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from include/linux/overflow.h:6,
from include/linux/string.h:13,
from include/linux/scatterlist.h:5,
from include/linux/iommu.h:10,
from drivers/iommu/iommufd/io_pagetable.c:13:
drivers/iommu/iommufd/io_pagetable.c: In function 'iopt_table_enforce_dev_resv_regions':
>> include/linux/limits.h:11:25: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
11 | #define PHYS_ADDR_MAX (~(phys_addr_t)0)
| ^
drivers/iommu/iommufd/io_pagetable.c:1461:39: note: in expansion of macro 'PHYS_ADDR_MAX'
1461 | unsigned long start = PHYS_ADDR_MAX, last = 0;
| ^~~~~~~~~~~~~

vim +11 include/linux/limits.h

54d50897d544c8 Masahiro Yamada 2019-03-07 8
54d50897d544c8 Masahiro Yamada 2019-03-07 9 #define SIZE_MAX (~(size_t)0)
dabba87229411a Pasha Tatashin 2022-05-27 10 #define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 @11 #define PHYS_ADDR_MAX (~(phys_addr_t)0)
54d50897d544c8 Masahiro Yamada 2019-03-07 12

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