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Date: Wed, 17 Feb 2021 21:56:08 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: kernel test robot <lkp@...el.com>,
Russell King <rmk+kernel@...linux.org.uk>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@....de>
Subject: Re: arch/arm/kernel/sys_oabi-compat.c:257:6: error: implicit
declaration of function 'ep_op_has_event'
On 2/17/21 9:26 PM, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: f40ddce88593482919761f74910f42f4b84c004b
> commit: c281634c865202e2776b0250678ff93c771947ff ARM: compat: remove KERNEL_DS usage in sys_oabi_epoll_ctl()
> date: 10 months ago
> config: arm-randconfig-m031-20210218 (attached as .config)
> compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
> 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
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c281634c865202e2776b0250678ff93c771947ff
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout c281634c865202e2776b0250678ff93c771947ff
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> arch/arm/kernel/sys_oabi-compat.c:142:17: warning: no previous prototype for 'sys_oabi_stat64' [-Wmissing-prototypes]
> 142 | asmlinkage long sys_oabi_stat64(const char __user * filename,
> | ^~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:152:17: warning: no previous prototype for 'sys_oabi_lstat64' [-Wmissing-prototypes]
> 152 | asmlinkage long sys_oabi_lstat64(const char __user * filename,
> | ^~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:162:17: warning: no previous prototype for 'sys_oabi_fstat64' [-Wmissing-prototypes]
> 162 | asmlinkage long sys_oabi_fstat64(unsigned long fd,
> | ^~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:172:17: warning: no previous prototype for 'sys_oabi_fstatat64' [-Wmissing-prototypes]
> 172 | asmlinkage long sys_oabi_fstatat64(int dfd,
> | ^~~~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:229:17: warning: no previous prototype for 'sys_oabi_fcntl64' [-Wmissing-prototypes]
> 229 | asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
> | ^~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:251:17: warning: no previous prototype for 'sys_oabi_epoll_ctl' [-Wmissing-prototypes]
> 251 | asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
> | ^~~~~~~~~~~~~~~~~~
> In file included from include/linux/kernel.h:11,
> from include/linux/list.h:9,
> from include/linux/wait.h:7,
> from include/linux/wait_bit.h:8,
> from include/linux/fs.h:6,
> from include/uapi/linux/aio_abi.h:31,
> from include/linux/syscalls.h:74,
> from arch/arm/kernel/sys_oabi-compat.c:73:
> arch/arm/kernel/sys_oabi-compat.c: In function 'sys_oabi_epoll_ctl':
>>> arch/arm/kernel/sys_oabi-compat.c:257:6: error: implicit declaration of function 'ep_op_has_event' [-Werror=implicit-function-declaration]
> 257 | if (ep_op_has_event(op) &&
> | ^~~~~~~~~~~~~~~
> include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
> 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> | ^~~~
> arch/arm/kernel/sys_oabi-compat.c:257:2: note: in expansion of macro 'if'
> 257 | if (ep_op_has_event(op) &&
> | ^~
>>> arch/arm/kernel/sys_oabi-compat.c:264:9: error: implicit declaration of function 'do_epoll_ctl'; did you mean 'sys_epoll_ctl'? [-Werror=implicit-function-declaration]
> 264 | return do_epoll_ctl(epfd, op, fd, &kernel, false);
> | ^~~~~~~~~~~~
> | sys_epoll_ctl
> arch/arm/kernel/sys_oabi-compat.c: At top level:
> arch/arm/kernel/sys_oabi-compat.c:267:17: warning: no previous prototype for 'sys_oabi_epoll_wait' [-Wmissing-prototypes]
> 267 | asmlinkage long sys_oabi_epoll_wait(int epfd,
> | ^~~~~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:309:17: warning: no previous prototype for 'sys_oabi_semtimedop' [-Wmissing-prototypes]
> 309 | asmlinkage long sys_oabi_semtimedop(int semid,
> | ^~~~~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:352:17: warning: no previous prototype for 'sys_oabi_semop' [-Wmissing-prototypes]
> 352 | asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
> | ^~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:358:16: warning: no previous prototype for 'sys_oabi_ipc' [-Wmissing-prototypes]
> 358 | asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
> | ^~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:376:17: warning: no previous prototype for 'sys_oabi_bind' [-Wmissing-prototypes]
> 376 | asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
> | ^~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:386:17: warning: no previous prototype for 'sys_oabi_connect' [-Wmissing-prototypes]
> 386 | asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
> | ^~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:396:17: warning: no previous prototype for 'sys_oabi_sendto' [-Wmissing-prototypes]
> 396 | asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
> | ^~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:409:17: warning: no previous prototype for 'sys_oabi_sendmsg' [-Wmissing-prototypes]
> 409 | asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
> | ^~~~~~~~~~~~~~~~
> arch/arm/kernel/sys_oabi-compat.c:435:17: warning: no previous prototype for 'sys_oabi_socketcall' [-Wmissing-prototypes]
> 435 | asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
> | ^~~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
>
>
> vim +/ep_op_has_event +257 arch/arm/kernel/sys_oabi-compat.c
>
> > 73 #include <linux/syscalls.h>
> 74 #include <linux/errno.h>
> 75 #include <linux/fs.h>
> 76 #include <linux/cred.h>
> 77 #include <linux/fcntl.h>
> 78 #include <linux/eventpoll.h>
> 79 #include <linux/sem.h>
> 80 #include <linux/socket.h>
> 81 #include <linux/net.h>
> 82 #include <linux/ipc.h>
> 83 #include <linux/uaccess.h>
> 84 #include <linux/slab.h>
> 85
> 86 struct oldabi_stat64 {
> 87 unsigned long long st_dev;
> 88 unsigned int __pad1;
> 89 unsigned long __st_ino;
> 90 unsigned int st_mode;
> 91 unsigned int st_nlink;
> 92
> 93 unsigned long st_uid;
> 94 unsigned long st_gid;
> 95
> 96 unsigned long long st_rdev;
> 97 unsigned int __pad2;
> 98
> 99 long long st_size;
> 100 unsigned long st_blksize;
> 101 unsigned long long st_blocks;
> 102
> 103 unsigned long st_atime;
> 104 unsigned long st_atime_nsec;
> 105
> 106 unsigned long st_mtime;
> 107 unsigned long st_mtime_nsec;
> 108
> 109 unsigned long st_ctime;
> 110 unsigned long st_ctime_nsec;
> 111
> 112 unsigned long long st_ino;
> 113 } __attribute__ ((packed,aligned(4)));
> 114
> 115 static long cp_oldabi_stat64(struct kstat *stat,
> 116 struct oldabi_stat64 __user *statbuf)
> 117 {
> 118 struct oldabi_stat64 tmp;
> 119
> 120 tmp.st_dev = huge_encode_dev(stat->dev);
> 121 tmp.__pad1 = 0;
> 122 tmp.__st_ino = stat->ino;
> 123 tmp.st_mode = stat->mode;
> 124 tmp.st_nlink = stat->nlink;
> 125 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
> 126 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
> 127 tmp.st_rdev = huge_encode_dev(stat->rdev);
> 128 tmp.st_size = stat->size;
> 129 tmp.st_blocks = stat->blocks;
> 130 tmp.__pad2 = 0;
> 131 tmp.st_blksize = stat->blksize;
> 132 tmp.st_atime = stat->atime.tv_sec;
> 133 tmp.st_atime_nsec = stat->atime.tv_nsec;
> 134 tmp.st_mtime = stat->mtime.tv_sec;
> 135 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
> 136 tmp.st_ctime = stat->ctime.tv_sec;
> 137 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
> 138 tmp.st_ino = stat->ino;
> 139 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
> 140 }
> 141
> 142 asmlinkage long sys_oabi_stat64(const char __user * filename,
> 143 struct oldabi_stat64 __user * statbuf)
> 144 {
> 145 struct kstat stat;
> 146 int error = vfs_stat(filename, &stat);
> 147 if (!error)
> 148 error = cp_oldabi_stat64(&stat, statbuf);
> 149 return error;
> 150 }
> 151
> 152 asmlinkage long sys_oabi_lstat64(const char __user * filename,
> 153 struct oldabi_stat64 __user * statbuf)
> 154 {
> 155 struct kstat stat;
> 156 int error = vfs_lstat(filename, &stat);
> 157 if (!error)
> 158 error = cp_oldabi_stat64(&stat, statbuf);
> 159 return error;
> 160 }
> 161
> 162 asmlinkage long sys_oabi_fstat64(unsigned long fd,
> 163 struct oldabi_stat64 __user * statbuf)
> 164 {
> 165 struct kstat stat;
> 166 int error = vfs_fstat(fd, &stat);
> 167 if (!error)
> 168 error = cp_oldabi_stat64(&stat, statbuf);
> 169 return error;
> 170 }
> 171
> 172 asmlinkage long sys_oabi_fstatat64(int dfd,
> 173 const char __user *filename,
> 174 struct oldabi_stat64 __user *statbuf,
> 175 int flag)
> 176 {
> 177 struct kstat stat;
> 178 int error;
> 179
> 180 error = vfs_fstatat(dfd, filename, &stat, flag);
> 181 if (error)
> 182 return error;
> 183 return cp_oldabi_stat64(&stat, statbuf);
> 184 }
> 185
> 186 struct oabi_flock64 {
> 187 short l_type;
> 188 short l_whence;
> 189 loff_t l_start;
> 190 loff_t l_len;
> 191 pid_t l_pid;
> 192 } __attribute__ ((packed,aligned(4)));
> 193
> 194 static long do_locks(unsigned int fd, unsigned int cmd,
> 195 unsigned long arg)
> 196 {
> 197 struct flock64 kernel;
> 198 struct oabi_flock64 user;
> 199 mm_segment_t fs;
> 200 long ret;
> 201
> 202 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
> 203 sizeof(user)))
> 204 return -EFAULT;
> 205 kernel.l_type = user.l_type;
> 206 kernel.l_whence = user.l_whence;
> 207 kernel.l_start = user.l_start;
> 208 kernel.l_len = user.l_len;
> 209 kernel.l_pid = user.l_pid;
> 210
> 211 fs = get_fs();
> 212 set_fs(KERNEL_DS);
> 213 ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel);
> 214 set_fs(fs);
> 215
> 216 if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) {
> 217 user.l_type = kernel.l_type;
> 218 user.l_whence = kernel.l_whence;
> 219 user.l_start = kernel.l_start;
> 220 user.l_len = kernel.l_len;
> 221 user.l_pid = kernel.l_pid;
> 222 if (copy_to_user((struct oabi_flock64 __user *)arg,
> 223 &user, sizeof(user)))
> 224 ret = -EFAULT;
> 225 }
> 226 return ret;
> 227 }
> 228
> 229 asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
> 230 unsigned long arg)
> 231 {
> 232 switch (cmd) {
> 233 case F_OFD_GETLK:
> 234 case F_OFD_SETLK:
> 235 case F_OFD_SETLKW:
> 236 case F_GETLK64:
> 237 case F_SETLK64:
> 238 case F_SETLKW64:
> 239 return do_locks(fd, cmd, arg);
> 240
> 241 default:
> 242 return sys_fcntl64(fd, cmd, arg);
> 243 }
> 244 }
> 245
> 246 struct oabi_epoll_event {
> 247 __u32 events;
> 248 __u64 data;
> 249 } __attribute__ ((packed,aligned(4)));
> 250
> 251 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
> 252 struct oabi_epoll_event __user *event)
> 253 {
> 254 struct oabi_epoll_event user;
> 255 struct epoll_event kernel;
> 256
> > 257 if (ep_op_has_event(op) &&
> 258 copy_from_user(&user, event, sizeof(user)))
> 259 return -EFAULT;
> 260
> 261 kernel.events = user.events;
> 262 kernel.data = user.data;
> 263
> > 264 return do_epoll_ctl(epfd, op, fd, &kernel, false);
> 265 }
> 266
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
I sent a patch for this on 2021-JAN-14.
Russell?
--
~Randy
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