[PATCH] proc: modify proc_pident_lookup to be completely table driven

Currently proc_pident_lookup gets the names and types from a table and then
has a huge switch statement to get the inode and file operations it needs.
That is silly and is becoming increasingly hard to maintain so I just put all
of the information in the table.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/proc/base.c

@@ -194,9 +194,36 @@ struct pid_entry {
 	int len;
 	char *name;
 	mode_t mode;
+	struct inode_operations *iop;
+	struct file_operations *fop;
+	union proc_op op;
 };
 
-#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
+#define NOD(TYPE, NAME, MODE, IOP, FOP, OP) {		\
+	.type = (TYPE),					\
+	.len  = sizeof(NAME) - 1,			\
+	.name = (NAME),					\
+	.mode = MODE,					\
+	.iop  = IOP,					\
+	.fop  = FOP,					\
+	.op   = OP,					\
+}
+
+#define DIR(TYPE, NAME, MODE, OTYPE)						\
+	NOD(TYPE, NAME, (S_IFDIR|(MODE)),					\
+		&proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations,	\
+		{} )
+#define LNK(TYPE, NAME, OTYPE)					\
+	NOD(TYPE, NAME, (S_IFLNK|S_IRWXUGO),			\
+		&proc_pid_link_inode_operations, NULL,		\
+		{ .proc_get_link = &proc_##OTYPE##_link } )
+#define REG(TYPE, NAME, MODE, OTYPE)			\
+	NOD(TYPE, NAME, (S_IFREG|(MODE)), NULL,		\
+		&proc_##OTYPE##_operations, {})
+#define INF(TYPE, NAME, MODE, OTYPE)			\
+	NOD(TYPE, NAME, (S_IFREG|(MODE)), 		\
+		NULL, &proc_info_file_operations,	\
+		{ .proc_read = &proc_##OTYPE } )
 
 static struct fs_struct *get_fs_struct(struct task_struct *task)
 {
@@ -1367,17 +1394,6 @@ static struct inode_operations proc_fd_inode_operations = {
 	.setattr	= proc_setattr,
 };
 
-static struct file_operations proc_task_operations;
-static struct inode_operations proc_task_inode_operations;
-
-#ifdef CONFIG_SECURITY
-static struct file_operations proc_pid_attr_operations;
-static struct file_operations proc_tid_attr_operations;
-static struct inode_operations proc_tid_attr_inode_operations;
-static struct file_operations proc_tgid_attr_operations;
-static struct inode_operations proc_tgid_attr_inode_operations;
-#endif
-
 /* SMP-safe */
 static struct dentry *proc_pident_lookup(struct inode *dir, 
 					 struct dentry *dentry,
@@ -1395,6 +1411,10 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
 	if (!task)
 		goto out_no_task;
 
+	/*
+	 * Yes, it does not scale. And it should not. Don't add
+	 * new entries into /proc/<tgid>/ without very good reasons.
+	 */
 	for (p = ents; p->name; p++) {
 		if (p->len != dentry->d_name.len)
 			continue;
@@ -1411,171 +1431,13 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
 
 	ei = PROC_I(inode);
 	inode->i_mode = p->mode;
-	/*
-	 * Yes, it does not scale. And it should not. Don't add
-	 * new entries into /proc/<tgid>/ without very good reasons.
-	 */
-	switch(p->type) {
-		case PROC_TGID_TASK:
-			inode->i_nlink = 2;
-			inode->i_op = &proc_task_inode_operations;
-			inode->i_fop = &proc_task_operations;
-			break;
-		case PROC_TID_FD:
-		case PROC_TGID_FD:
-			inode->i_nlink = 2;
-			inode->i_op = &proc_fd_inode_operations;
-			inode->i_fop = &proc_fd_operations;
-			break;
-		case PROC_TID_EXE:
-		case PROC_TGID_EXE:
-			inode->i_op = &proc_pid_link_inode_operations;
-			ei->op.proc_get_link = proc_exe_link;
-			break;
-		case PROC_TID_CWD:
-		case PROC_TGID_CWD:
-			inode->i_op = &proc_pid_link_inode_operations;
-			ei->op.proc_get_link = proc_cwd_link;
-			break;
-		case PROC_TID_ROOT:
-		case PROC_TGID_ROOT:
-			inode->i_op = &proc_pid_link_inode_operations;
-			ei->op.proc_get_link = proc_root_link;
-			break;
-		case PROC_TID_ENVIRON:
-		case PROC_TGID_ENVIRON:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_environ;
-			break;
-		case PROC_TID_AUXV:
-		case PROC_TGID_AUXV:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_auxv;
-			break;
-		case PROC_TID_STATUS:
-		case PROC_TGID_STATUS:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_status;
-			break;
-		case PROC_TID_STAT:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_tid_stat;
-			break;
-		case PROC_TGID_STAT:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_tgid_stat;
-			break;
-		case PROC_TID_CMDLINE:
-		case PROC_TGID_CMDLINE:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_cmdline;
-			break;
-		case PROC_TID_STATM:
-		case PROC_TGID_STATM:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_statm;
-			break;
-		case PROC_TID_MAPS:
-		case PROC_TGID_MAPS:
-			inode->i_fop = &proc_maps_operations;
-			break;
-#ifdef CONFIG_NUMA
-		case PROC_TID_NUMA_MAPS:
-		case PROC_TGID_NUMA_MAPS:
-			inode->i_fop = &proc_numa_maps_operations;
-			break;
-#endif
-		case PROC_TID_MEM:
-		case PROC_TGID_MEM:
-			inode->i_fop = &proc_mem_operations;
-			break;
-#ifdef CONFIG_SECCOMP
-		case PROC_TID_SECCOMP:
-		case PROC_TGID_SECCOMP:
-			inode->i_fop = &proc_seccomp_operations;
-			break;
-#endif /* CONFIG_SECCOMP */
-		case PROC_TID_MOUNTS:
-		case PROC_TGID_MOUNTS:
-			inode->i_fop = &proc_mounts_operations;
-			break;
-#ifdef CONFIG_MMU
-		case PROC_TID_SMAPS:
-		case PROC_TGID_SMAPS:
-			inode->i_fop = &proc_smaps_operations;
-			break;
-#endif
-		case PROC_TID_MOUNTSTATS:
-		case PROC_TGID_MOUNTSTATS:
-			inode->i_fop = &proc_mountstats_operations;
-			break;
-#ifdef CONFIG_SECURITY
-		case PROC_TID_ATTR:
-			inode->i_nlink = 2;
-			inode->i_op = &proc_tid_attr_inode_operations;
-			inode->i_fop = &proc_tid_attr_operations;
-			break;
-		case PROC_TGID_ATTR:
-			inode->i_nlink = 2;
-			inode->i_op = &proc_tgid_attr_inode_operations;
-			inode->i_fop = &proc_tgid_attr_operations;
-			break;
-		case PROC_TID_ATTR_CURRENT:
-		case PROC_TGID_ATTR_CURRENT:
-		case PROC_TID_ATTR_PREV:
-		case PROC_TGID_ATTR_PREV:
-		case PROC_TID_ATTR_EXEC:
-		case PROC_TGID_ATTR_EXEC:
-		case PROC_TID_ATTR_FSCREATE:
-		case PROC_TGID_ATTR_FSCREATE:
-		case PROC_TID_ATTR_KEYCREATE:
-		case PROC_TGID_ATTR_KEYCREATE:
-		case PROC_TID_ATTR_SOCKCREATE:
-		case PROC_TGID_ATTR_SOCKCREATE:
-			inode->i_fop = &proc_pid_attr_operations;
-			break;
-#endif
-#ifdef CONFIG_KALLSYMS
-		case PROC_TID_WCHAN:
-		case PROC_TGID_WCHAN:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_wchan;
-			break;
-#endif
-#ifdef CONFIG_SCHEDSTATS
-		case PROC_TID_SCHEDSTAT:
-		case PROC_TGID_SCHEDSTAT:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_pid_schedstat;
-			break;
-#endif
-#ifdef CONFIG_CPUSETS
-		case PROC_TID_CPUSET:
-		case PROC_TGID_CPUSET:
-			inode->i_fop = &proc_cpuset_operations;
-			break;
-#endif
-		case PROC_TID_OOM_SCORE:
-		case PROC_TGID_OOM_SCORE:
-			inode->i_fop = &proc_info_file_operations;
-			ei->op.proc_read = proc_oom_score;
-			break;
-		case PROC_TID_OOM_ADJUST:
-		case PROC_TGID_OOM_ADJUST:
-			inode->i_fop = &proc_oom_adjust_operations;
-			break;
-#ifdef CONFIG_AUDITSYSCALL
-		case PROC_TID_LOGINUID:
-		case PROC_TGID_LOGINUID:
-			inode->i_fop = &proc_loginuid_operations;
-			break;
-#endif
-		default:
-			printk("procfs: impossible type (%d)",p->type);
-			iput(inode);
-			error = ERR_PTR(-EINVAL);
-			goto out;
-	}
+	if (S_ISDIR(inode->i_mode))
+		inode->i_nlink = 2;	/* Use getattr to fix if necessary */
+	if (p->iop)
+		inode->i_op = p->iop;
+	if (p->fop)
+		inode->i_fop = p->fop;
+	ei->op = p->op;
 	dentry->d_op = &pid_dentry_operations;
 	d_add(dentry, inode);
 	/* Close the race of the process dying before we return the dentry */
@@ -1720,22 +1582,22 @@ static struct file_operations proc_pid_attr_operations = {
 };
 
 static struct pid_entry tgid_attr_stuff[] = {
-	E(PROC_TGID_ATTR_CURRENT,  "current",  S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TGID_ATTR_PREV,     "prev",     S_IFREG|S_IRUGO),
-	E(PROC_TGID_ATTR_EXEC,     "exec",     S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO),
-	{0,0,NULL,0}
+	REG(PROC_TGID_ATTR_CURRENT,    "current",    S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TGID_ATTR_PREV,       "prev",       S_IRUGO,	      pid_attr),
+	REG(PROC_TGID_ATTR_EXEC,       "exec",       S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TGID_ATTR_FSCREATE,   "fscreate",   S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TGID_ATTR_KEYCREATE,  "keycreate",  S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IRUGO|S_IWUGO, pid_attr),
+	{}
 };
 static struct pid_entry tid_attr_stuff[] = {
-	E(PROC_TID_ATTR_CURRENT,   "current",  S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TID_ATTR_PREV,      "prev",     S_IFREG|S_IRUGO),
-	E(PROC_TID_ATTR_EXEC,      "exec",     S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TID_ATTR_FSCREATE,  "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO),
-	E(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO),
-	{0,0,NULL,0}
+	REG(PROC_TID_ATTR_CURRENT,    "current",    S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TID_ATTR_PREV,       "prev",       S_IRUGO,	     pid_attr),
+	REG(PROC_TID_ATTR_EXEC,       "exec",       S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TID_ATTR_FSCREATE,   "fscreate",   S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TID_ATTR_KEYCREATE,  "keycreate",  S_IRUGO|S_IWUGO, pid_attr),
+	REG(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IRUGO|S_IWUGO, pid_attr),
+	{}
 };
 
 static int proc_tgid_attr_readdir(struct file * filp,
@@ -1813,49 +1675,52 @@ static struct inode_operations proc_self_inode_operations = {
 /*
  * Thread groups
  */
+static struct file_operations proc_task_operations;
+static struct inode_operations proc_task_inode_operations;
+
 static struct pid_entry tgid_base_stuff[] = {
-	E(PROC_TGID_TASK,      "task",    S_IFDIR|S_IRUGO|S_IXUGO),
-	E(PROC_TGID_FD,        "fd",      S_IFDIR|S_IRUSR|S_IXUSR),
-	E(PROC_TGID_ENVIRON,   "environ", S_IFREG|S_IRUSR),
-	E(PROC_TGID_AUXV,      "auxv",	  S_IFREG|S_IRUSR),
-	E(PROC_TGID_STATUS,    "status",  S_IFREG|S_IRUGO),
-	E(PROC_TGID_CMDLINE,   "cmdline", S_IFREG|S_IRUGO),
-	E(PROC_TGID_STAT,      "stat",    S_IFREG|S_IRUGO),
-	E(PROC_TGID_STATM,     "statm",   S_IFREG|S_IRUGO),
-	E(PROC_TGID_MAPS,      "maps",    S_IFREG|S_IRUGO),
+	DIR(PROC_TGID_TASK,       "task",       S_IRUGO|S_IXUGO, task),
+	DIR(PROC_TGID_FD,         "fd",         S_IRUSR|S_IXUSR, fd),
+	INF(PROC_TGID_ENVIRON,    "environ",    S_IRUSR, pid_environ),
+	INF(PROC_TGID_AUXV,       "auxv",       S_IRUSR, pid_auxv),
+	INF(PROC_TGID_STATUS,     "status",     S_IRUGO, pid_status),
+	INF(PROC_TGID_CMDLINE,    "cmdline",    S_IRUGO, pid_cmdline),
+	INF(PROC_TGID_STAT,       "stat",       S_IRUGO, tgid_stat),
+	INF(PROC_TGID_STATM,      "statm",      S_IRUGO, pid_statm),
+	REG(PROC_TGID_MAPS,       "maps",       S_IRUGO, maps),
 #ifdef CONFIG_NUMA
-	E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
+	REG(PROC_TGID_NUMA_MAPS,  "numa_maps",  S_IRUGO, numa_maps),
 #endif
-	E(PROC_TGID_MEM,       "mem",     S_IFREG|S_IRUSR|S_IWUSR),
+	REG(PROC_TGID_MEM,        "mem",        S_IRUSR|S_IWUSR, mem),
 #ifdef CONFIG_SECCOMP
-	E(PROC_TGID_SECCOMP,   "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
+	REG(PROC_TGID_SECCOMP,    "seccomp",    S_IRUSR|S_IWUSR, seccomp),
 #endif
-	E(PROC_TGID_CWD,       "cwd",     S_IFLNK|S_IRWXUGO),
-	E(PROC_TGID_ROOT,      "root",    S_IFLNK|S_IRWXUGO),
-	E(PROC_TGID_EXE,       "exe",     S_IFLNK|S_IRWXUGO),
-	E(PROC_TGID_MOUNTS,    "mounts",  S_IFREG|S_IRUGO),
-	E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR),
+	LNK(PROC_TGID_CWD,        "cwd",        cwd),
+	LNK(PROC_TGID_ROOT,       "root",       root),
+	LNK(PROC_TGID_EXE,        "exe",        exe),
+	REG(PROC_TGID_MOUNTS,     "mounts",     S_IRUGO, mounts),
+	REG(PROC_TGID_MOUNTSTATS, "mountstats", S_IRUSR, mountstats),
 #ifdef CONFIG_MMU
-	E(PROC_TGID_SMAPS,     "smaps",   S_IFREG|S_IRUGO),
+	REG(PROC_TGID_SMAPS,      "smaps",      S_IRUGO, smaps),
 #endif
 #ifdef CONFIG_SECURITY
-	E(PROC_TGID_ATTR,      "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
+	DIR(PROC_TGID_ATTR,       "attr",       S_IRUGO|S_IXUGO, tgid_attr),
 #endif
 #ifdef CONFIG_KALLSYMS
-	E(PROC_TGID_WCHAN,     "wchan",   S_IFREG|S_IRUGO),
+	INF(PROC_TGID_WCHAN,      "wchan",      S_IRUGO, pid_wchan),
 #endif
 #ifdef CONFIG_SCHEDSTATS
-	E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
+	INF(PROC_TGID_SCHEDSTAT,  "schedstat",  S_IRUGO, pid_schedstat),
 #endif
 #ifdef CONFIG_CPUSETS
-	E(PROC_TGID_CPUSET,    "cpuset",  S_IFREG|S_IRUGO),
+	REG(PROC_TGID_CPUSET,     "cpuset",     S_IRUGO, cpuset),
 #endif
-	E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
-	E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
+	INF(PROC_TGID_OOM_SCORE,  "oom_score",  S_IRUGO, oom_score),
+	REG(PROC_TGID_OOM_ADJUST, "oom_adj",    S_IRUGO|S_IWUSR, oom_adjust),
 #ifdef CONFIG_AUDITSYSCALL
-	E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
+	REG(PROC_TGID_LOGINUID,   "loginuid",   S_IWUSR|S_IRUGO, loginuid),
 #endif
-	{0,0,NULL,0}
+	{}
 };
 
 static int proc_tgid_base_readdir(struct file * filp,
@@ -2088,46 +1953,46 @@ int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
  * Tasks
  */
 static struct pid_entry tid_base_stuff[] = {
-	E(PROC_TID_FD,         "fd",      S_IFDIR|S_IRUSR|S_IXUSR),
-	E(PROC_TID_ENVIRON,    "environ", S_IFREG|S_IRUSR),
-	E(PROC_TID_AUXV,       "auxv",	  S_IFREG|S_IRUSR),
-	E(PROC_TID_STATUS,     "status",  S_IFREG|S_IRUGO),
-	E(PROC_TID_CMDLINE,    "cmdline", S_IFREG|S_IRUGO),
-	E(PROC_TID_STAT,       "stat",    S_IFREG|S_IRUGO),
-	E(PROC_TID_STATM,      "statm",   S_IFREG|S_IRUGO),
-	E(PROC_TID_MAPS,       "maps",    S_IFREG|S_IRUGO),
+	DIR(PROC_TID_FD,         "fd",        S_IRUSR|S_IXUSR, fd),
+	INF(PROC_TID_ENVIRON,    "environ",   S_IRUSR, pid_environ),
+	INF(PROC_TID_AUXV,       "auxv",      S_IRUSR, pid_auxv),
+	INF(PROC_TID_STATUS,     "status",    S_IRUGO, pid_status),
+	INF(PROC_TID_CMDLINE,    "cmdline",   S_IRUGO, pid_cmdline),
+	INF(PROC_TID_STAT,       "stat",      S_IRUGO, tid_stat),
+	INF(PROC_TID_STATM,      "statm",     S_IRUGO, pid_statm),
+	REG(PROC_TID_MAPS,       "maps",      S_IRUGO, maps),
 #ifdef CONFIG_NUMA
-	E(PROC_TID_NUMA_MAPS,  "numa_maps",    S_IFREG|S_IRUGO),
+	REG(PROC_TID_NUMA_MAPS,  "numa_maps", S_IRUGO, numa_maps),
 #endif
-	E(PROC_TID_MEM,        "mem",     S_IFREG|S_IRUSR|S_IWUSR),
+	REG(PROC_TID_MEM,        "mem",       S_IRUSR|S_IWUSR, mem),
 #ifdef CONFIG_SECCOMP
-	E(PROC_TID_SECCOMP,    "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
+	REG(PROC_TID_SECCOMP,    "seccomp",   S_IRUSR|S_IWUSR, seccomp),
 #endif
-	E(PROC_TID_CWD,        "cwd",     S_IFLNK|S_IRWXUGO),
-	E(PROC_TID_ROOT,       "root",    S_IFLNK|S_IRWXUGO),
-	E(PROC_TID_EXE,        "exe",     S_IFLNK|S_IRWXUGO),
-	E(PROC_TID_MOUNTS,     "mounts",  S_IFREG|S_IRUGO),
+	LNK(PROC_TID_CWD,        "cwd",       cwd),
+	LNK(PROC_TID_ROOT,       "root",      root),
+	LNK(PROC_TID_EXE,        "exe",       exe),
+	REG(PROC_TID_MOUNTS,     "mounts",    S_IRUGO, mounts),
 #ifdef CONFIG_MMU
-	E(PROC_TID_SMAPS,      "smaps",   S_IFREG|S_IRUGO),
+	REG(PROC_TID_SMAPS,      "smaps",     S_IRUGO, smaps),
 #endif
 #ifdef CONFIG_SECURITY
-	E(PROC_TID_ATTR,       "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
+	DIR(PROC_TID_ATTR,       "attr",      S_IRUGO|S_IXUGO, tid_attr),
 #endif
 #ifdef CONFIG_KALLSYMS
-	E(PROC_TID_WCHAN,      "wchan",   S_IFREG|S_IRUGO),
+	INF(PROC_TID_WCHAN,      "wchan",     S_IRUGO, pid_wchan),
 #endif
 #ifdef CONFIG_SCHEDSTATS
-	E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
+	INF(PROC_TID_SCHEDSTAT,  "schedstat", S_IRUGO, pid_schedstat),
 #endif
 #ifdef CONFIG_CPUSETS
-	E(PROC_TID_CPUSET,     "cpuset",  S_IFREG|S_IRUGO),
+	REG(PROC_TID_CPUSET,     "cpuset",    S_IRUGO, cpuset),
 #endif
-	E(PROC_TID_OOM_SCORE,  "oom_score",S_IFREG|S_IRUGO),
-	E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
+	INF(PROC_TID_OOM_SCORE,  "oom_score", S_IRUGO, oom_score),
+	REG(PROC_TID_OOM_ADJUST, "oom_adj",   S_IRUGO|S_IWUSR, oom_adjust),
 #ifdef CONFIG_AUDITSYSCALL
-	E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
+	REG(PROC_TID_LOGINUID,   "loginuid",  S_IWUSR|S_IRUGO, loginuid),
 #endif
-	{0,0,NULL,0}
+	{}
 };
 
 static int proc_tid_base_readdir(struct file * filp,

include/linux/proc_fs.h

@@ -244,13 +244,15 @@ static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 extern void kclist_add(struct kcore_list *, void *, size_t);
 #endif
 
+union proc_op {
+	int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
+	int (*proc_read)(struct task_struct *task, char *page);
+};
+
 struct proc_inode {
 	struct pid *pid;
 	int fd;
-	union {
-		int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
-		int (*proc_read)(struct task_struct *task, char *page);
-	} op;
+	union proc_op op;
 	struct proc_dir_entry *pde;
 	struct inode vfs_inode;
 };