[PATCH] devfs patch for 2.5.8-pre2

- Documentation updates
- BKL removal (devfs doesn't need the BKL)
- Changed <devfs_rmdir> to allow later additions if not yet empty
- Added calls to <devfs_register_partitions> in drivers/block/blkpc.c
  <add_partition> and <del_partition>
- Bug fixes in unique number and devnum allocators.

Documentation/filesystems/devfs/ChangeLog

@@ -1885,3 +1885,23 @@ Changes for patch v208
 - Cleaned up declaration of <stat_read>
 
 - Updated README from master HTML file
+===============================================================================
+Changes for patch v209
+
+- Updated README from master HTML file
+
+- Removed silently introduced calls to lock_kernel() and
+  unlock_kernel() due to recent VFS locking changes. BKL isn't
+  required in devfs 
+
+- Changed <devfs_rmdir> to allow later additions if not yet empty
+
+- Added calls to <devfs_register_partitions> in drivers/block/blkpc.c
+  <add_partition> and <del_partition>
+
+- Fixed bug in <devfs_alloc_unique_number>: was clearing beyond
+  bitfield
+
+- Fixed bitfield data type for <devfs_*alloc_devnum>
+
+- Made major bitfield type and initialiser 64 bit safe

Documentation/filesystems/devfs/README

@@ -3,7 +3,7 @@ Devfs (Device File System) FAQ
 
 Linux Devfs (Device File System) FAQ
 Richard Gooch
-24-JAN-2002
+4-APR-2002
 
 
 Document languages:
@@ -803,12 +803,19 @@ devfsd /dev
 
 add the following lines to your /etc/devfsd.conf file:
 
-REGISTER	^pt[sy]/.*	IGNORE
-CHANGE		^pt[sy]/.*	IGNORE
+REGISTER	^pt[sy]		IGNORE
+CREATE		^pt[sy]		IGNORE
+CHANGE		^pt[sy]		IGNORE
+DELETE		^pt[sy]		IGNORE
 REGISTER	.*		COPY	/dev-state/$devname $devpath
-CHANGE		.*		COPY	$devpath /dev-state/$devname
 CREATE		.*		COPY	$devpath /dev-state/$devname
+CHANGE		.*		COPY	$devpath /dev-state/$devname
+DELETE		.*		CFUNCTION GLOBAL unlink /dev-state/$devname
+RESTORE		/dev-state
 
+Note that the sample devfsd.conf file contains these lines,
+as well as other sample configurations you may find useful. See the
+devfsd distribution
 
 
 reboot.
@@ -872,7 +879,8 @@ You can then slowly migrate your system to using the new device names
 (for example, by starting with /etc/fstab), and then limiting the
 compatibility entries that devfsd creates.
 
-MAKE SURE YOU INSTALL DEVFSD BEFORE YOU BOOT A DEVFS-ENABLED KERNEL!
+IF YOU CONFIGURE TO MOUNT DEVFS AT BOOT, MAKE SURE YOU INSTALL DEVFSD
+BEFORE YOU BOOT A DEVFS-ENABLED KERNEL!
 
 Now that devfs has gone into the 2.3.46 kernel, I'm getting a lot of
 reports back. Many of these are because people are trying to run
@@ -1565,6 +1573,24 @@ character device, named pipe, etc.) may change without notice. Only
 the existence of the entry should be relied upon.
 
 
+When I start devfsd, I see the error:
+Error opening file: ".devfsd"   No such file or directory?
+
+This means that devfs is not mounted. Make sure you have devfs mounted.
+
+
+How do I mount devfs?
+
+First make sure you have devfs compiled into your kernel (see
+above). Then you will either need to:
+
+set CONFIG_DEVFS_MOUNT=y in your kernel config
+pass devfs=mount to your boot loader
+mount devfs manually in your boot scripts with:
+mount -t none devfs /dev
+
+
+
 
 
 
@@ -1760,6 +1786,15 @@ steps below:
 
 
 
+make sure you have enabled debugging output when configuring your
+kernel. You will need to set (at least) the following config options:
+
+CONFIG_DEVFS_DEBUG=y
+CONFIG_DEBUG_KERNEL=y
+CONFIG_DEBUG_SLAB=y
+
+
+
 please make sure you have the latest devfs patches applied. The
 latest kernel version might not have the latest devfs patches applied
 yet (Linus is very busy)
@@ -1768,7 +1803,10 @@ yet (Linus is very busy)
 save a copy of your complete kernel logs (preferably by
 using the dmesg programme) for later inclusion in your bug
 report. You may need to use the -s switch to increase the
-internal buffer size so you can capture all the boot messages
+internal buffer size so you can capture all the boot messages.
+Don't edit or trim the dmesg output
+
+
 
 
 try booting with devfs=dall passed to the kernel boot
@@ -1925,7 +1963,7 @@ http://www.atnf.csiro.au/~rgooch/linux/docs/devfs.html
 
 A Korean translation by viatoris@nownuri.net is available at
 
-http://viatoris.new21.org/devfs/devfs.html
+http://your.destiny.pe.kr/devfs/devfs.html
 
 
 

drivers/block/blkpg.c

@@ -113,6 +113,7 @@ int add_partition(struct block_device *bdev, struct blkpg_partition *p)
 	g->part[minor].nr_sects = plength;
 	if (g->sizes)
 		g->sizes[minor] = (plength >> (BLOCK_SIZE_BITS - 9));
+	devfs_register_partitions (g, first_minor, 0);
 	return 0;
 }
 
@@ -172,6 +173,7 @@ int del_partition(struct block_device *bdev, struct blkpg_partition *p)
 	g->part[minor].nr_sects = 0;
 	if (g->sizes)
 		g->sizes[minor] = 0;
+	devfs_register_partitions (g, first_minor, 0);
 	bd_release(bdevp);
 	bdput(bdevp);
 

fs/devfs/base.c

@@ -612,6 +612,14 @@
 	       Added KERN_* to remaining messages.
 	       Cleaned up declaration of <stat_read>.
   v1.11
+    20020219   Richard Gooch <rgooch@atnf.csiro.au>
+	       Changed <devfs_rmdir> to allow later additions if not yet empty.
+  v1.12
+    20020406   Richard Gooch <rgooch@atnf.csiro.au>
+	       Removed silently introduced calls to lock_kernel() and
+	       unlock_kernel() due to recent VFS locking changes. BKL isn't
+	       required in devfs.
+  v1.13
 */
 #include <linux/types.h>
 #include <linux/errno.h>
@@ -644,7 +652,7 @@
 #include <asm/bitops.h>
 #include <asm/atomic.h>
 
-#define DEVFS_VERSION            "1.11 (20020129)"
+#define DEVFS_VERSION            "1.13 (20020406)"
 
 #define DEVFS_NAME "devfs"
 
@@ -2667,7 +2675,7 @@ static int devfs_readdir (struct file *file, void *dirent, filldir_t filldir)
       case 0:
 	scan_dir_for_removable (parent);
 	err = (*filldir) (dirent, "..", 2, file->f_pos,
-			  parent_ino(file->f_dentry), DT_DIR);
+			  parent_ino (file->f_dentry), DT_DIR);
 	if (err == -EINVAL) break;
 	if (err < 0) return err;
 	file->f_pos++;
@@ -2933,14 +2941,10 @@ static struct dentry *devfs_lookup (struct inode *dir, struct dentry *dentry)
 	up on any error  */
     dentry->d_op = &devfs_dops;
     /*  First try to get the devfs entry for this directory  */
-    lock_kernel();
     parent = get_devfs_entry_from_vfs_inode (dir);
     DPRINTK (DEBUG_I_LOOKUP, "(%s): dentry: %p parent: %p by: \"%s\"\n",
 	     dentry->d_name.name, dentry, parent, current->comm);
-    if (parent == NULL) {
-	unlock_kernel();
-	return ERR_PTR (-ENOENT);
-    }
+    if (parent == NULL) return ERR_PTR (-ENOENT);
     read_lock (&parent->u.dir.lock);
     de = _devfs_search_dir (parent, dentry->d_name.name, dentry->d_name.len);
     read_unlock (&parent->u.dir.lock);
@@ -2965,7 +2969,6 @@ static struct dentry *devfs_lookup (struct inode *dir, struct dentry *dentry)
 	if (try_modload (parent, fs_info,
 			 dentry->d_name.name, dentry->d_name.len, &tmp) < 0)
 	{   /*  Lookup event was not queued to devfsd  */
-	    unlock_kernel();
 	    d_add (dentry, NULL);
 	    return NULL;
 	}
@@ -3008,7 +3011,6 @@ static struct dentry *devfs_lookup (struct inode *dir, struct dentry *dentry)
     wake_up (&lookup_info.wait_queue);
     write_unlock (&parent->u.dir.lock);
     devfs_put (de);
-    unlock_kernel();
     return retval;
 }   /*  End Function devfs_lookup  */
 
@@ -3019,30 +3021,19 @@ static int devfs_unlink (struct inode *dir, struct dentry *dentry)
     struct inode *inode = dentry->d_inode;
     struct fs_info *fs_info = dir->i_sb->u.generic_sbp;
 
-    lock_kernel();
     de = get_devfs_entry_from_vfs_inode (inode);
     DPRINTK (DEBUG_I_UNLINK, "(%s): de: %p\n", dentry->d_name.name, de);
-    if (de == NULL) {
-	unlock_kernel();
-	return -ENOENT;
-    }
-    if (!de->vfs_deletable) {
-	unlock_kernel();
-	return -EPERM;
-    }
+    if (de == NULL) return -ENOENT;
+    if (!de->vfs_deletable) return -EPERM;
     write_lock (&de->parent->u.dir.lock);
     unhooked = _devfs_unhook (de);
     write_unlock (&de->parent->u.dir.lock);
-    if (!unhooked) {
-	unlock_kernel();
-	return -ENOENT;
-    }
+    if (!unhooked) return -ENOENT;
     if ( !is_devfsd_or_child (fs_info) )
 	devfsd_notify_de (de, DEVFSD_NOTIFY_DELETE, inode->i_mode,
 			  inode->i_uid, inode->i_gid, fs_info, 0);
     free_dentry (de);
     devfs_put (de);
-    unlock_kernel();
     return 0;
 }   /*  End Function devfs_unlink  */
 
@@ -3055,37 +3046,27 @@ static int devfs_symlink (struct inode *dir, struct dentry *dentry,
     struct inode *inode;
 
     /*  First try to get the devfs entry for this directory  */
-    lock_kernel();
     parent = get_devfs_entry_from_vfs_inode (dir);
-    if (parent == NULL) {
-	unlock_kernel();
-	return -ENOENT;
-    }
+    if (parent == NULL) return -ENOENT;
     err = devfs_do_symlink (parent, dentry->d_name.name, DEVFS_FL_NONE,
 			    symname, &de, NULL);
     DPRINTK (DEBUG_DISABLED, "(%s): errcode from <devfs_do_symlink>: %d\n",
 	     dentry->d_name.name, err);
-    if (err < 0) {
-	unlock_kernel();
-	return err;
-    }
+    if (err < 0) return err;
     de->vfs_deletable = TRUE;
     de->inode.uid = current->euid;
     de->inode.gid = current->egid;
     de->inode.atime = CURRENT_TIME;
     de->inode.mtime = CURRENT_TIME;
     de->inode.ctime = CURRENT_TIME;
-    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL ) {
-	unlock_kernel();
+    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL )
 	return -ENOMEM;
-    }
     DPRINTK (DEBUG_DISABLED, "(%s): new VFS inode(%u): %p  dentry: %p\n",
 	     dentry->d_name.name, de->inode.ino, inode, dentry);
     d_instantiate (dentry, inode);
     if ( !is_devfsd_or_child (fs_info) )
 	devfsd_notify_de (de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
 			  inode->i_uid, inode->i_gid, fs_info, 0);
-    unlock_kernel();
     return 0;
 }   /*  End Function devfs_symlink  */
 
@@ -3097,38 +3078,26 @@ static int devfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
     struct inode *inode;
 
     mode = (mode & ~S_IFMT) | S_IFDIR;  /*  VFS doesn't pass S_IFMT part  */
-    lock_kernel();
     parent = get_devfs_entry_from_vfs_inode (dir);
-    if (parent == NULL) {
-	unlock_kernel();
-	return -ENOENT;
-    }
+    if (parent == NULL) return -ENOENT;
     de = _devfs_alloc_entry (dentry->d_name.name, dentry->d_name.len, mode);
-    if (!de) {
-	unlock_kernel();
-	return -ENOMEM;
-    }
+    if (!de) return -ENOMEM;
     de->vfs_deletable = TRUE;
-    if ( ( err = _devfs_append_entry (parent, de, FALSE, NULL) ) != 0 ) {
-	unlock_kernel();
+    if ( ( err = _devfs_append_entry (parent, de, FALSE, NULL) ) != 0 )
 	return err;
-    }
     de->inode.uid = current->euid;
     de->inode.gid = current->egid;
     de->inode.atime = CURRENT_TIME;
     de->inode.mtime = CURRENT_TIME;
     de->inode.ctime = CURRENT_TIME;
-    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL ) {
-	unlock_kernel();
+    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL )
 	return -ENOMEM;
-    }
     DPRINTK (DEBUG_DISABLED, "(%s): new VFS inode(%u): %p  dentry: %p\n",
 	     dentry->d_name.name, de->inode.ino, inode, dentry);
     d_instantiate (dentry, inode);
     if ( !is_devfsd_or_child (fs_info) )
 	devfsd_notify_de (de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
 			  inode->i_uid, inode->i_gid, fs_info, 0);
-    unlock_kernel();
     return 0;
 }   /*  End Function devfs_mkdir  */
 
@@ -3139,45 +3108,27 @@ static int devfs_rmdir (struct inode *dir, struct dentry *dentry)
     struct fs_info *fs_info = dir->i_sb->u.generic_sbp;
     struct inode *inode = dentry->d_inode;
 
-    /* WTF??? */
     if (dir->i_sb->u.generic_sbp != inode->i_sb->u.generic_sbp) return -EINVAL;
-    lock_kernel();
     de = get_devfs_entry_from_vfs_inode (inode);
-    if (de == NULL) {
-	unlock_kernel();
-	return -ENOENT;
-    }
-    if ( !S_ISDIR (de->mode) ) {
-	unlock_kernel();
-	return -ENOTDIR;
-    }
-    if (!de->vfs_deletable) {
-	unlock_kernel();
-	return -EPERM;
-    }
-    /*  First ensure the directory is empty and will stay thay way  */
+    if (de == NULL) return -ENOENT;
+    if ( !S_ISDIR (de->mode) ) return -ENOTDIR;
+    if (!de->vfs_deletable) return -EPERM;
+    /*  First ensure the directory is empty and will stay that way  */
     write_lock (&de->u.dir.lock);
-    de->u.dir.no_more_additions = TRUE;
     if (de->u.dir.first) err = -ENOTEMPTY;
+    else de->u.dir.no_more_additions = TRUE;
     write_unlock (&de->u.dir.lock);
-    if (err) {
-	unlock_kernel();
-	return err;
-    }
+    if (err) return err;
     /*  Now unhook the directory from it's parent  */
     write_lock (&de->parent->u.dir.lock);
     if ( !_devfs_unhook (de) ) err = -ENOENT;
     write_unlock (&de->parent->u.dir.lock);
-    if (err) {
-	unlock_kernel();
-	return err;
-    }
+    if (err) return err;
     if ( !is_devfsd_or_child (fs_info) )
 	devfsd_notify_de (de, DEVFSD_NOTIFY_DELETE, inode->i_mode,
 			  inode->i_uid, inode->i_gid, fs_info, 0);
     free_dentry (de);
     devfs_put (de);
-    unlock_kernel();
     return 0;
 }   /*  End Function devfs_rmdir  */
 
@@ -3191,43 +3142,31 @@ static int devfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
 
     DPRINTK (DEBUG_I_MKNOD, "(%s): mode: 0%o  dev: %d\n",
 	     dentry->d_name.name, mode, rdev);
-    lock_kernel();
     parent = get_devfs_entry_from_vfs_inode (dir);
-    if (parent == NULL) {
-	unlock_kernel();
-	return -ENOENT;
-    }
+    if (parent == NULL) return -ENOENT;
     de = _devfs_alloc_entry (dentry->d_name.name, dentry->d_name.len, mode);
-    if (!de) {
-	unlock_kernel();
-	return -ENOMEM;
-    }
+    if (!de) return -ENOMEM;
     de->vfs_deletable = TRUE;
     if ( S_ISBLK (mode) || S_ISCHR (mode) )
     {
 	de->u.fcb.u.device.major = MAJOR (rdev);
 	de->u.fcb.u.device.minor = MINOR (rdev);
     }
-    if ( ( err = _devfs_append_entry (parent, de, FALSE, NULL) ) != 0 ) {
-	unlock_kernel();
+    if ( ( err = _devfs_append_entry (parent, de, FALSE, NULL) ) != 0 )
 	return err;
-    }
     de->inode.uid = current->euid;
     de->inode.gid = current->egid;
     de->inode.atime = CURRENT_TIME;
     de->inode.mtime = CURRENT_TIME;
     de->inode.ctime = CURRENT_TIME;
-    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL ) {
-	unlock_kernel();
+    if ( ( inode = _devfs_get_vfs_inode (dir->i_sb, de, dentry) ) == NULL )
 	return -ENOMEM;
-    }
     DPRINTK (DEBUG_I_MKNOD, ":   new VFS inode(%u): %p  dentry: %p\n",
 	     de->inode.ino, inode, dentry);
     d_instantiate (dentry, inode);
     if ( !is_devfsd_or_child (fs_info) )
 	devfsd_notify_de (de, DEVFSD_NOTIFY_CREATE, inode->i_mode,
 			  inode->i_uid, inode->i_gid, fs_info, 0);
-    unlock_kernel();
     return 0;
 }   /*  End Function devfs_mknod  */
 
@@ -3301,15 +3240,16 @@ static int devfs_fill_super (struct super_block *sb, void *data, int silent)
     PRINTK ("(): get root inode failed\n");
     if (root_inode) iput (root_inode);
     return -EINVAL;
-}   /*  End Function devfs_read_super  */
+}   /*  End Function devfs_fill_super  */
 
-static struct super_block *devfs_get_sb(struct file_system_type *fs_type,
+static struct super_block *devfs_get_sb (struct file_system_type *fs_type,
 					 int flags, char *dev_name, void *data)
 {
-	return get_sb_single(fs_type, flags, data, devfs_fill_super);
+    return get_sb_single (fs_type, flags, data, devfs_fill_super);
 }
 
-static struct file_system_type devfs_fs_type = {
+static struct file_system_type devfs_fs_type =
+{
     name:	DEVFS_NAME,
     get_sb:	devfs_get_sb,
     kill_sb:	kill_anon_super,

fs/devfs/util.c

 /*  devfs (Device FileSystem) utilities.
 
-    Copyright (C) 1999-2001  Richard Gooch
+    Copyright (C) 1999-2002  Richard Gooch
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
@@ -48,6 +48,12 @@
     20010818   Richard Gooch <rgooch@atnf.csiro.au>
                Updated major masks up to Linus' "no new majors" proclamation.
 	       Block: were 126 now 122 free, char: were 26 now 19 free.
+    20020324   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixed bug in <devfs_alloc_unique_number>: was clearing beyond
+	       bitfield.
+    20020326   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixed bitfield data type for <devfs_*alloc_devnum>.
+               Made major bitfield type and initialiser 64 bit safe.
 */
 #include <linux/module.h>
 #include <linux/init.h>
@@ -125,8 +131,13 @@ EXPORT_SYMBOL(devfs_register_series);
 struct major_list
 {
     spinlock_t lock;
-    __u32 bits[8];
+    unsigned long bits[256 / BITS_PER_LONG];
 };
+#if BITS_PER_LONG == 32
+#  define INITIALISER64(low,high) (low), (high)
+#else
+#  define INITIALISER64(low,high) ( (high) << 32 | (low) )
+#endif
 
 /*  Block majors already assigned:
     0-3, 7-9, 11-63, 65-99, 101-113, 120-127, 199, 201, 240-255
@@ -134,14 +145,11 @@ struct major_list
 */
 static struct major_list block_major_list =
 {SPIN_LOCK_UNLOCKED,
-    {0xfffffb8f,  /*  Majors 0   to 31   */
-     0xffffffff,  /*  Majors 32  to 63   */
-     0xfffffffe,  /*  Majors 64  to 95   */
-     0xff03ffef,  /*  Majors 96  to 127  */
-     0x00000000,  /*  Majors 128 to 159  */
-     0x00000000,  /*  Majors 160 to 191  */
-     0x00000280,  /*  Majors 192 to 223  */
-     0xffff0000}  /*  Majors 224 to 255  */
+    {INITIALISER64 (0xfffffb8f, 0xffffffff),  /*  Majors 0-31,    32-63    */
+     INITIALISER64 (0xfffffffe, 0xff03ffef),  /*  Majors 64-95,   96-127   */
+     INITIALISER64 (0x00000000, 0x00000000),  /*  Majors 128-159, 160-191  */
+     INITIALISER64 (0x00000280, 0xffff0000),  /*  Majors 192-223, 224-255  */
+    }
 };
 
 /*  Char majors already assigned:
@@ -150,14 +158,11 @@ static struct major_list block_major_list =
 */
 static struct major_list char_major_list =
 {SPIN_LOCK_UNLOCKED,
-    {0xfffffeff,  /*  Majors 0   to 31   */
-     0xffffffff,  /*  Majors 32  to 63   */
-     0xffffffff,  /*  Majors 64  to 95   */
-     0xffffffff,  /*  Majors 96  to 127  */
-     0x7cffffff,  /*  Majors 128 to 159  */
-     0xffffffff,  /*  Majors 160 to 191  */
-     0x3f0fffff,  /*  Majors 192 to 223  */
-     0xffff007f}  /*  Majors 224 to 255  */
+    {INITIALISER64 (0xfffffeff, 0xffffffff),  /*  Majors 0-31,    32-63    */
+     INITIALISER64 (0xffffffff, 0xffffffff),  /*  Majors 64-95,   96-127   */
+     INITIALISER64 (0x7cffffff, 0xffffffff),  /*  Majors 128-159, 160-191  */
+     INITIALISER64 (0x3f0fffff, 0xffff007f),  /*  Majors 192-223, 224-255  */
+    }
 };
 
 
@@ -212,7 +217,7 @@ EXPORT_SYMBOL(devfs_dealloc_major);
 struct minor_list
 {
     int major;
-    __u32 bits[8];
+    unsigned long bits[256 / BITS_PER_LONG];
     struct minor_list *next;
 };
 
@@ -267,7 +272,7 @@ kdev_t devfs_alloc_devnum (char type)
 	if (minor >= 256) continue;
 	__set_bit (minor, entry->bits);
 	up (semaphore);
-	return mk_kdev(entry->major, minor);
+	return mk_kdev (entry->major, minor);
     }
     /*  Need to allocate a new major  */
     if ( ( entry = kmalloc (sizeof *entry, GFP_KERNEL) ) == NULL )
@@ -289,7 +294,7 @@ kdev_t devfs_alloc_devnum (char type)
     else list->last->next = entry;
     list->last = entry;
     up (semaphore);
-    return mk_kdev(entry->major, 0);
+    return mk_kdev (entry->major, 0);
 }   /*  End Function devfs_alloc_devnum  */
 EXPORT_SYMBOL(devfs_alloc_devnum);
 
@@ -309,7 +314,7 @@ void devfs_dealloc_devnum (char type, kdev_t devnum)
     struct device_list *list;
     struct minor_list *entry;
 
-    if (kdev_none(devnum)) return;
+    if ( kdev_none (devnum) ) return;
     if (type == DEVFS_SPECIAL_CHR)
     {
 	semaphore = &char_semaphore;
@@ -355,7 +360,6 @@ int devfs_alloc_unique_number (struct unique_numspace *space)
 {
     int number;
     unsigned int length;
-    __u32 *bits;
 
     /*  Get around stupid lack of semaphore initialiser  */
     spin_lock (&space->init_lock);
@@ -368,6 +372,8 @@ int devfs_alloc_unique_number (struct unique_numspace *space)
     down (&space->semaphore);
     if (space->num_free < 1)
     {
+	void *bits;
+
 	if (space->length < 16) length = 16;
 	else length = space->length << 1;
 	if ( ( bits = vmalloc (length) ) == NULL )

include/linux/devfs_fs_kernel.h

@@ -54,7 +54,7 @@ struct unique_numspace
     unsigned char sem_initialised;
     unsigned int num_free;          /*  Num free in bits       */
     unsigned int length;            /*  Array length in bytes  */
-    __u32 *bits;
+    unsigned long *bits;
     struct semaphore semaphore;
 };