[kbuild-all] [android-common:android12-5.4 1/1] drivers/iommu/iommu.c:1885:5: warning: no previous prototype for function '__iommu_map'

tree: https://android.googlesource.com/kernel/common android12-5.4 head: 62ec51519fa16401c33a867135ad9489af22ff3a commit: 62ec51519fa16401c33a867135ad9489af22ff3a [1/1] UPSTREAM: iommu: Add gfp parameter to iommu_ops::map config: x86_64-randconfig-r002-20210112 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 68ff52ffead2ba25cca442778ab19286000daad7) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android12-5.4 git checkout 62ec51519fa16401c33a867135ad9489af22ff3a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): drivers/iommu/iommu.c:309:5: warning: no previous prototype for function 'iommu_insert_resv_region' [-Wmissing-prototypes] int iommu_insert_resv_region(struct iommu_resv_region *new, ^ drivers/iommu/iommu.c:309:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int iommu_insert_resv_region(struct iommu_resv_region *new, ^ static int __iommu_map(struct iommu_domain *domain, unsigned long iova, ^ drivers/iommu/iommu.c:1885:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __iommu_map(struct iommu_domain *domain, unsigned long iova, ^ static size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, ^ drivers/iommu/iommu.c:2036:1: note: declare 'static' if the function is not intended to be used outside of this translation unit size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, ^ static 3 warnings generated. vim +/__iommu_map +1885 drivers/iommu/iommu.c 1884 1886 phys_addr_t paddr, size_t size, int prot, gfp_t gfp) 1887 { 1888 const struct iommu_ops *ops = domain->ops; 1889 unsigned long orig_iova = iova; 1890 unsigned int min_pagesz; 1891 size_t orig_size = size; 1892 phys_addr_t orig_paddr = paddr; 1893 int ret = 0; 1894 1895 if (unlikely(ops->map == NULL || 1896 domain->pgsize_bitmap == 0UL)) 1897 return -ENODEV; 1898 1899 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) 1900 return -EINVAL; 1901 1902 /* find out the minimum page size supported */ 1903 min_pagesz = 1 << __ffs(domain->pgsize_bitmap); 1904 1905 /* 1906 * both the virtual address and the physical one, as well as 1907 * the size of the mapping, must be aligned (at least) to the 1908 * size of the smallest page supported by the hardware 1909 */ 1910 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { 1911 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", 1912 iova, &paddr, size, min_pagesz); 1913 return -EINVAL; 1914 } 1915 1916 pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); 1917 1918 while (size) { 1919 size_t pgsize = iommu_pgsize(domain, iova | paddr, size); 1920 1921 pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", 1922 iova, &paddr, pgsize); 1923 ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); 1924 1925 if (ret) 1926 break; 1927 1928 iova += pgsize; 1929 paddr += pgsize; 1930 size -= pgsize; 1931 } 1932 1933 if (ops->iotlb_sync_map) 1934 ops->iotlb_sync_map(domain); 1935 1936 /* unroll mapping in case something went wrong */ 1937 if (ret) 1938 iommu_unmap(domain, orig_iova, orig_size - size); 1939 else 1940 trace_map(orig_iova, orig_paddr, orig_size); 1941 1942 return ret; 1943 } 1944 1945 int iommu_map(struct iommu_domain *domain, unsigned long iova, 1946 phys_addr_t paddr, size_t size, int prot) 1947 { 1948 might_sleep(); 1949 return __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); 1950 } 1951 EXPORT_SYMBOL_GPL(iommu_map); 1952 1953 int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, 1954 phys_addr_t paddr, size_t size, int prot) 1955 { 1956 return __iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); 1957 } 1958 EXPORT_SYMBOL_GPL(iommu_map_atomic); 1959 1960 static size_t __iommu_unmap(struct iommu_domain *domain, 1961 unsigned long iova, size_t size, 1962 struct iommu_iotlb_gather *iotlb_gather) 1963 { 1964 const struct iommu_ops *ops = domain->ops; 1965 size_t unmapped_page, unmapped = 0; 1966 unsigned long orig_iova = iova; 1967 unsigned int min_pagesz; 1968 1969 if (unlikely(ops->unmap == NULL || 1970 domain->pgsize_bitmap == 0UL)) 1971 return 0; 1972 1973 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) 1974 return 0; 1975 1976 /* find out the minimum page size supported */ 1977 min_pagesz = 1 << __ffs(domain->pgsize_bitmap); 1978 1979 /* 1980 * The virtual address, as well as the size of the mapping, must be 1981 * aligned (at least) to the size of the smallest page supported 1982 * by the hardware 1983 */ 1984 if (!IS_ALIGNED(iova | size, min_pagesz)) { 1985 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", 1986 iova, size, min_pagesz); 1987 return 0; 1988 } 1989 1990 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); 1991 1992 /* 1993 * Keep iterating until we either unmap 'size' bytes (or more) 1994 * or we hit an area that isn't mapped. 1995 */ 1996 while (unmapped < size) { 1997 size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); 1998 1999 unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); 2000 if (!unmapped_page) 2001 break; 2002 2003 pr_debug("unmapped: iova 0x%lx size 0x%zx\n", 2004 iova, unmapped_page); 2005 2006 iova += unmapped_page; 2007 unmapped += unmapped_page; 2008 } 2009 2010 trace_unmap(orig_iova, size, unmapped); 2011 return unmapped; 2012 } 2013 2014 size_t iommu_unmap(struct iommu_domain *domain, 2015 unsigned long iova, size_t size) 2016 { 2017 struct iommu_iotlb_gather iotlb_gather; 2018 size_t ret; 2019 2020 iommu_iotlb_gather_init(&iotlb_gather); 2021 ret = __iommu_unmap(domain, iova, size, &iotlb_gather); 2022 iommu_tlb_sync(domain, &iotlb_gather); 2023 2024 return ret; 2025 } 2026 EXPORT_SYMBOL_GPL(iommu_unmap); 2027 2028 size_t iommu_unmap_fast(struct iommu_domain *domain, 2029 unsigned long iova, size_t size, 2030 struct iommu_iotlb_gather *iotlb_gather) 2031 { 2032 return __iommu_unmap(domain, iova, size, iotlb_gather); 2033 } 2034 EXPORT_SYMBOL_GPL(iommu_unmap_fast); 2035 2037 struct scatterlist *sg, unsigned int nents, int prot, 2038 gfp_t gfp) 2039 { 2040 size_t len = 0, mapped = 0; 2041 phys_addr_t start; 2042 unsigned int i = 0; 2043 int ret; 2044 2045 while (i <= nents) { 2046 phys_addr_t s_phys = sg_phys(sg); 2047 2048 if (len && s_phys != start + len) { 2049 ret = __iommu_map(domain, iova + mapped, start, 2050 len, prot, gfp); 2051 2052 if (ret) 2053 goto out_err; 2054 2055 mapped += len; 2056 len = 0; 2057 } 2058 2059 if (len) { 2060 len += sg->length; 2061 } else { 2062 len = sg->length; 2063 start = s_phys; 2064 } 2065 2066 if (++i < nents) 2067 sg = sg_next(sg); 2068 } 2069 2070 return mapped; 2071 2072 out_err: 2073 /* undo mappings already done */ 2074 iommu_unmap(domain, iova, mapped); 2075 2076 return 0; 2077 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org