tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y head: d3e70b39d31a36dd7611410e535bd0762f3824f9 commit: 2f7ed3b41f24ea9a083e73b715e1e0277d8d14bb [1042/1178] vt: keyboard, simplify vt_kdgkbsent config: m68k-randconfig-s032-20201118 (attached as .config) compiler: m68k-linux-gcc (GCC) 7.5.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-123-g626c4742-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.9.y git checkout 2f7ed3b41f24ea9a083e73b715e1e0277d8d14bb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/tty/vt/keyboard.c:1653:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1653:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1653:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1653:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got unsigned int [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1653:21: sparse: expected void * drivers/tty/vt/keyboard.c:1653:21: sparse: got unsigned int [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1655:27: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got struct kbdiacr [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1655:27: sparse: expected void * drivers/tty/vt/keyboard.c:1655:27: sparse: got struct kbdiacr [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1680:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1680:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1680:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1680:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got unsigned int [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1680:21: sparse: expected void * drivers/tty/vt/keyboard.c:1680:21: sparse: got unsigned int [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1682:26: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got struct kbdiacruc [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1682:26: sparse: expected void * drivers/tty/vt/keyboard.c:1682:26: sparse: got struct kbdiacruc [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1698:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1698:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1698:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1698:21: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const * @@ got unsigned int [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1698:21: sparse: expected void const * drivers/tty/vt/keyboard.c:1698:21: sparse: got unsigned int [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1736:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1736:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1736:21: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1736:21: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const * @@ got unsigned int [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1736:21: sparse: expected void const * drivers/tty/vt/keyboard.c:1736:21: sparse: got unsigned int [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1836:13: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const * @@ got struct kbkeycode [noderef] <asn:1> *user_kbkc @@ drivers/tty/vt/keyboard.c:1836:13: sparse: expected void const * drivers/tty/vt/keyboard.c:1836:13: sparse: got struct kbkeycode [noderef] <asn:1> *user_kbkc drivers/tty/vt/keyboard.c:1842:30: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1842:30: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1842:30: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1842:30: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got unsigned int [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1842:30: sparse: expected void * drivers/tty/vt/keyboard.c:1842:30: sparse: got unsigned int [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1865:13: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const * @@ got struct kbentry [noderef] <asn:1> *user_kbe @@ drivers/tty/vt/keyboard.c:1865:13: sparse: expected void const * drivers/tty/vt/keyboard.c:1865:13: sparse: got struct kbentry [noderef] <asn:1> *user_kbe drivers/tty/vt/keyboard.c:1883:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1883:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1883:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:1883:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got unsigned short [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:1883:24: sparse: expected void * drivers/tty/vt/keyboard.c:1883:24: sparse: got unsigned short [noderef] <asn:1> * drivers/tty/vt/keyboard.c:1984:13: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const * @@ got struct kbsentry [noderef] <asn:1> *user_kdgkb @@ drivers/tty/vt/keyboard.c:1984:13: sparse: expected void const * drivers/tty/vt/keyboard.c:1984:13: sparse: got struct kbsentry [noderef] <asn:1> *user_kdgkb drivers/tty/vt/keyboard.c:1996:23: sparse: expected void * drivers/tty/vt/keyboard.c:1996:23: sparse: got unsigned char [noderef] <asn:1> * drivers/tty/vt/keyboard.c:2098:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2098:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2098:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2098:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got char [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:2098:24: sparse: expected void * drivers/tty/vt/keyboard.c:2098:24: sparse: got char [noderef] <asn:1> * drivers/tty/vt/keyboard.c:2116:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2116:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2116:24: sparse: sparse: cast removes address space '<asn:1>' of expression drivers/tty/vt/keyboard.c:2116:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got char [noderef] <asn:1> * @@ drivers/tty/vt/keyboard.c:2116:24: sparse: expected void * drivers/tty/vt/keyboard.c:2116:24: sparse: got char [noderef] <asn:1> * drivers/tty/vt/keyboard.c: In function 'k_fn': drivers/tty/vt/keyboard.c:714:22: warning: comparison is always true due to limited range of data type [-Wtype-limits] if ((unsigned)value < ARRAY_SIZE(func_table)) { ^ vim +1996 drivers/tty/vt/keyboard.c 1961 1962 /* FIXME: This one needs untangling and locking */ 1963 int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) 1964 { 1965 struct kbsentry *kbs; 1966 u_char *q; 1967 int sz, fnw_sz; 1968 int delta; 1969 char *first_free, *fj, *fnw; 1970 int i, j, k; 1971 int ret; 1972 unsigned long flags; 1973 1974 if (!capable(CAP_SYS_TTY_CONFIG)) 1975 perm = 0; 1976 1977 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); 1978 if (!kbs) { 1979 ret = -ENOMEM; 1980 goto reterr; 1981 } 1982 1983 /* we mostly copy too much here (512bytes), but who cares ;) */ 1984 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { 1985 ret = -EFAULT; 1986 goto reterr; 1987 } 1988 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; 1989 i = kbs->kb_func; 1990 1991 switch (cmd) { 1992 case KDGKBSENT: { 1993 /* size should have been a struct member */ 1994 unsigned char *from = func_table[i] ? : ""; 1995 1997 strlen(from) + 1) ? -EFAULT : 0; 1998 1999 goto reterr; 2000 } 2001 case KDSKBSENT: 2002 if (!perm) { 2003 ret = -EPERM; 2004 goto reterr; 2005 } 2006 2007 fnw = NULL; 2008 fnw_sz = 0; 2009 /* race aginst other writers */ 2010 again: 2011 spin_lock_irqsave(&func_buf_lock, flags); 2012 q = func_table[i]; 2013 2014 /* fj pointer to next entry after 'q' */ 2015 first_free = funcbufptr + (funcbufsize - funcbufleft); 2016 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) 2017 ; 2018 if (j < MAX_NR_FUNC) 2019 fj = func_table[j]; 2020 else 2021 fj = first_free; 2022 /* buffer usage increase by new entry */ 2023 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); 2024 2025 if (delta <= funcbufleft) { /* it fits in current buf */ 2026 if (j < MAX_NR_FUNC) { 2027 /* make enough space for new entry at 'fj' */ 2028 memmove(fj + delta, fj, first_free - fj); 2029 for (k = j; k < MAX_NR_FUNC; k++) 2030 if (func_table[k]) 2031 func_table[k] += delta; 2032 } 2033 if (!q) 2034 func_table[i] = fj; 2035 funcbufleft -= delta; 2036 } else { /* allocate a larger buffer */ 2037 sz = 256; 2038 while (sz < funcbufsize - funcbufleft + delta) 2039 sz <<= 1; 2040 if (fnw_sz != sz) { 2041 spin_unlock_irqrestore(&func_buf_lock, flags); 2042 kfree(fnw); 2043 fnw = kmalloc(sz, GFP_KERNEL); 2044 fnw_sz = sz; 2045 if (!fnw) { 2046 ret = -ENOMEM; 2047 goto reterr; 2048 } 2049 goto again; 2050 } 2051 2052 if (!q) 2053 func_table[i] = fj; 2054 /* copy data before insertion point to new location */ 2055 if (fj > funcbufptr) 2056 memmove(fnw, funcbufptr, fj - funcbufptr); 2057 for (k = 0; k < j; k++) 2058 if (func_table[k]) 2059 func_table[k] = fnw + (func_table[k] - funcbufptr); 2060 2061 /* copy data after insertion point to new location */ 2062 if (first_free > fj) { 2063 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); 2064 for (k = j; k < MAX_NR_FUNC; k++) 2065 if (func_table[k]) 2066 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; 2067 } 2068 if (funcbufptr != func_buf) 2069 kfree(funcbufptr); 2070 funcbufptr = fnw; 2071 funcbufleft = funcbufleft - delta + sz - funcbufsize; 2072 funcbufsize = sz; 2073 } 2074 /* finally insert item itself */ 2075 strcpy(func_table[i], kbs->kb_string); 2076 spin_unlock_irqrestore(&func_buf_lock, flags); 2077 break; 2078 } 2079 ret = 0; 2080 reterr: 2081 kfree(kbs); 2082 return ret; 2083 } 2084 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org