[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <202505092119.UALKhnIX-lkp@intel.com>
Date: Fri, 9 May 2025 22:13:04 +0800
From: kernel test robot <lkp@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, jgg@...dia.com,
kevin.tian@...el.com, corbet@....net, will@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
yi.l.liu@...el.com, mshavit@...gle.com, praan@...gle.com,
zhangzekun11@...wei.com, iommu@...ts.linux.dev,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com
Subject: Re: [PATCH v4 14/23] iommufd: Add mmap interface
Hi Nicolin,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 92a09c47464d040866cf2b4cd052bc60555185fb]
url: https://github.com/intel-lab-lkp/linux/commits/Nicolin-Chen/iommufd-viommu-Add-driver-allocated-vDEVICE-support/20250509-110521
base: 92a09c47464d040866cf2b4cd052bc60555185fb
patch link: https://lore.kernel.org/r/ee9ee287264fd75eb4fc64a63f20d03e9ba18161.1746757630.git.nicolinc%40nvidia.com
patch subject: [PATCH v4 14/23] iommufd: Add mmap interface
config: i386-buildonly-randconfig-003-20250509 (https://download.01.org/0day-ci/archive/20250509/202505092119.UALKhnIX-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250509/202505092119.UALKhnIX-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/202505092119.UALKhnIX-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/iommu/iommufd/driver.c:91:6: warning: variable 'num_pfns' set but not used [-Wunused-but-set-variable]
91 | int num_pfns, rc;
| ^
1 warning generated.
vim +/num_pfns +91 drivers/iommu/iommufd/driver.c
80
81 /*
82 * Allocate an @offset to return to user space to use for an mmap() syscall
83 *
84 * Driver should use a per-structure helper in include/linux/iommufd.h
85 */
86 int _iommufd_alloc_mmap(struct iommufd_ctx *ictx, struct iommufd_object *owner,
87 phys_addr_t base, size_t length, unsigned long *offset)
88 {
89 struct iommufd_mmap *immap;
90 unsigned long startp;
> 91 int num_pfns, rc;
92
93 if (WARN_ON_ONCE(!offset))
94 return -EINVAL;
95 if (!PAGE_ALIGNED(base))
96 return -EINVAL;
97 if (!length || !PAGE_ALIGNED(length))
98 return -EINVAL;
99 num_pfns = length >> PAGE_SHIFT;
100
101 immap = kzalloc(sizeof(*immap), GFP_KERNEL);
102 if (!immap)
103 return -ENOMEM;
104 immap->owner = owner;
105 immap->base_pfn = base >> PAGE_SHIFT;
106 immap->num_pfns = length >> PAGE_SHIFT;
107
108 rc = mtree_alloc_range(&ictx->mt_mmap, &startp, immap, immap->num_pfns,
109 0, U32_MAX >> PAGE_SHIFT, GFP_KERNEL);
110 if (rc < 0) {
111 kfree(immap);
112 return rc;
113 }
114
115 /* mmap() syscall will right-shift the offset in vma->vm_pgoff */
116 *offset = startp << PAGE_SHIFT;
117 return 0;
118 }
119 EXPORT_SYMBOL_NS_GPL(_iommufd_alloc_mmap, "IOMMUFD");
120
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Powered by blists - more mailing lists