slab allocators: Remove SLAB_DEBUG_INITIAL flag

I have never seen a use of SLAB_DEBUG_INITIAL.  It is only supported by
SLAB.

I think its purpose was to have a callback after an object has been freed
to verify that the state is the constructor state again?  The callback is
performed before each freeing of an object.

I would think that it is much easier to check the object state manually
before the free.  That also places the check near the code object
manipulation of the object.

Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was
compiled with SLAB debugging on.  If there would be code in a constructor
handling SLAB_DEBUG_INITIAL then it would have to be conditional on
SLAB_DEBUG otherwise it would just be dead code.  But there is no such code
in the kernel.  I think SLUB_DEBUG_INITIAL is too problematic to make real
use of, difficult to understand and there are easier ways to accomplish the
same effect (i.e.  add debug code before kfree).

There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be
clear in fs inode caches.  Remove the pointless checks (they would even be
pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.

This is the last slab flag that SLUB did not support.  Remove the check for
unimplemented flags from SLUB.

Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

arch/powerpc/platforms/cell/spufs/inode.c

@@ -71,8 +71,7 @@ spufs_init_once(void *p, struct kmem_cache * cachep, unsigned long flags)
 {
 	struct spufs_inode_info *ei = p;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		inode_init_once(&ei->vfs_inode);
 	}
 }

drivers/mtd/ubi/eba.c

@@ -940,8 +940,7 @@ static void ltree_entry_ctor(void *obj, struct kmem_cache *cache,
 {
 	struct ltree_entry *le = obj;
 
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) !=
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		return;
 
 	le->users = 0;

fs/adfs/super.c

@@ -232,8 +232,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/affs/super.c

@@ -87,8 +87,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct affs_inode_info *ei = (struct affs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		init_MUTEX(&ei->i_link_lock);
 		init_MUTEX(&ei->i_ext_lock);
 		inode_init_once(&ei->vfs_inode);

fs/afs/super.c

@@ -453,8 +453,7 @@ static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
 {
 	struct afs_vnode *vnode = _vnode;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		memset(vnode, 0, sizeof(*vnode));
 		inode_init_once(&vnode->vfs_inode);
 		init_waitqueue_head(&vnode->update_waitq);

fs/befs/linuxvfs.c

@@ -293,8 +293,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
         struct befs_inode_info *bi = (struct befs_inode_info *) foo;
 
-	        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-		            SLAB_CTOR_CONSTRUCTOR) {
+	        if (flags & SLAB_CTOR_CONSTRUCTOR) {
 			inode_init_once(&bi->vfs_inode);
 		}
 }

fs/bfs/inode.c

@@ -248,8 +248,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct bfs_inode_info *bi = foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&bi->vfs_inode);
 }
 

fs/block_dev.c

@@ -457,9 +457,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 	struct bdev_inode *ei = (struct bdev_inode *) foo;
 	struct block_device *bdev = &ei->bdev;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
-	{
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		memset(bdev, 0, sizeof(*bdev));
 		mutex_init(&bdev->bd_mutex);
 		sema_init(&bdev->bd_mount_sem, 1);

fs/buffer.c

@@ -2953,8 +2953,7 @@ EXPORT_SYMBOL(free_buffer_head);
 static void
 init_buffer_head(void *data, struct kmem_cache *cachep, unsigned long flags)
 {
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-			    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		struct buffer_head * bh = (struct buffer_head *)data;
 
 		memset(bh, 0, sizeof(*bh));

fs/cifs/cifsfs.c

@@ -701,8 +701,7 @@ cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
 {
 	struct cifsInodeInfo *cifsi = inode;
 
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		inode_init_once(&cifsi->vfs_inode);
 		INIT_LIST_HEAD(&cifsi->lockList);
 	}

fs/coda/inode.c

@@ -62,8 +62,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct coda_inode_info *ei = (struct coda_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/ecryptfs/main.c

@@ -583,8 +583,7 @@ inode_info_init_once(void *vptr, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
 
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/efs/super.c

@@ -72,8 +72,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct efs_inode_info *ei = (struct efs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/ext2/super.c

@@ -160,8 +160,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		rwlock_init(&ei->i_meta_lock);
 #ifdef CONFIG_EXT2_FS_XATTR
 		init_rwsem(&ei->xattr_sem);

fs/ext3/super.c

@@ -466,8 +466,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		INIT_LIST_HEAD(&ei->i_orphan);
 #ifdef CONFIG_EXT3_FS_XATTR
 		init_rwsem(&ei->xattr_sem);

fs/ext4/super.c

@@ -517,8 +517,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		INIT_LIST_HEAD(&ei->i_orphan);
 #ifdef CONFIG_EXT4DEV_FS_XATTR
 		init_rwsem(&ei->xattr_sem);

fs/fat/cache.c

@@ -40,8 +40,7 @@ static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct fat_cache *cache = (struct fat_cache *)foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		INIT_LIST_HEAD(&cache->cache_list);
 }
 

fs/fat/inode.c

@@ -499,8 +499,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		spin_lock_init(&ei->cache_lru_lock);
 		ei->nr_caches = 0;
 		ei->cache_valid_id = FAT_CACHE_VALID + 1;

fs/fuse/inode.c

@@ -685,8 +685,7 @@ static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep,
 {
 	struct inode * inode = foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(inode);
 }
 

fs/gfs2/main.c

@@ -27,8 +27,7 @@
 static void gfs2_init_inode_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct gfs2_inode *ip = foo;
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		inode_init_once(&ip->i_inode);
 		spin_lock_init(&ip->i_spin);
 		init_rwsem(&ip->i_rw_mutex);
@@ -39,8 +38,7 @@ static void gfs2_init_inode_once(void *foo, struct kmem_cache *cachep, unsigned
 static void gfs2_init_glock_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct gfs2_glock *gl = foo;
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		INIT_HLIST_NODE(&gl->gl_list);
 		spin_lock_init(&gl->gl_spin);
 		INIT_LIST_HEAD(&gl->gl_holders);

fs/hfs/super.c

@@ -434,7 +434,7 @@ static void hfs_init_once(void *p, struct kmem_cache *cachep, unsigned long flag
 {
 	struct hfs_inode_info *i = p;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&i->vfs_inode);
 }
 

fs/hfsplus/super.c

@@ -470,7 +470,7 @@ static void hfsplus_init_once(void *p, struct kmem_cache *cachep, unsigned long
 {
 	struct hfsplus_inode_info *i = p;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&i->vfs_inode);
 }
 

fs/hpfs/super.c

@@ -176,8 +176,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		mutex_init(&ei->i_mutex);
 		mutex_init(&ei->i_parent_mutex);
 		inode_init_once(&ei->vfs_inode);

fs/hugetlbfs/inode.c

@@ -556,8 +556,7 @@ static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/inode.c

@@ -213,8 +213,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct inode * inode = (struct inode *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(inode);
 }
 

fs/isofs/inode.c

@@ -77,8 +77,7 @@ static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags
 {
 	struct iso_inode_info *ei = foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/jffs2/super.c

@@ -47,8 +47,7 @@ static void jffs2_i_init_once(void * foo, struct kmem_cache * cachep, unsigned l
 {
 	struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		init_MUTEX(&ei->sem);
 		inode_init_once(&ei->vfs_inode);
 	}

fs/jfs/jfs_metapage.c

@@ -184,8 +184,7 @@ static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
 {
 	struct metapage *mp = (struct metapage *)foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		mp->lid = 0;
 		mp->lsn = 0;
 		mp->flag = 0;

fs/jfs/super.c

@@ -752,8 +752,7 @@ static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags
 {
 	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 		INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 		init_rwsem(&jfs_ip->rdwrlock);

fs/locks.c

@@ -203,8 +203,7 @@ static void init_once(void *foo, struct kmem_cache *cache, unsigned long flags)
 {
 	struct file_lock *lock = (struct file_lock *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) !=
-					SLAB_CTOR_CONSTRUCTOR)
+	if (!(flags & SLAB_CTOR_CONSTRUCTOR))
 		return;
 
 	locks_init_lock(lock);

fs/minix/inode.c

@@ -73,8 +73,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct minix_inode_info *ei = (struct minix_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/ncpfs/inode.c

@@ -60,8 +60,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct ncp_inode_info *ei = (struct ncp_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		mutex_init(&ei->open_mutex);
 		inode_init_once(&ei->vfs_inode);
 	}

fs/nfs/inode.c

@@ -1167,8 +1167,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct nfs_inode *nfsi = (struct nfs_inode *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		inode_init_once(&nfsi->vfs_inode);
 		spin_lock_init(&nfsi->req_lock);
 		INIT_LIST_HEAD(&nfsi->dirty);

fs/ntfs/super.c

@@ -3085,8 +3085,7 @@ static void ntfs_big_inode_init_once(void *foo, struct kmem_cache *cachep,
 {
 	ntfs_inode *ni = (ntfs_inode *)foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-			SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(VFS_I(ni));
 }
 

fs/ocfs2/dlm/dlmfs.c

@@ -263,8 +263,7 @@ static void dlmfs_init_once(void *foo,
 	struct dlmfs_inode_private *ip =
 		(struct dlmfs_inode_private *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		ip->ip_dlm = NULL;
 		ip->ip_parent = NULL;
 

fs/ocfs2/super.c

@@ -937,8 +937,7 @@ static void ocfs2_inode_init_once(void *data,
 {
 	struct ocfs2_inode_info *oi = data;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR) {
+	if (flags & SLAB_CTOR_CONSTRUCTOR) {
 		oi->ip_flags = 0;
 		oi->ip_open_count = 0;
 		spin_lock_init(&oi->ip_lock);

fs/openpromfs/inode.c

@@ -419,8 +419,7 @@ static void op_inode_init_once(void *data, struct kmem_cache * cachep, unsigned
 {
 	struct op_inode_info *oi = (struct op_inode_info *) data;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&oi->vfs_inode);
 }
 

fs/proc/inode.c

@@ -109,8 +109,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 {
 	struct proc_inode *ei = (struct proc_inode *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }
 

fs/qnx4/inode.c

@@ -536,8 +536,7 @@ static void init_once(void *foo, struct kmem_cache * cachep,
 {
 	struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
-	    SLAB_CTOR_CONSTRUCTOR)
+	if (flags & SLAB_CTOR_CONSTRUCTOR)
 		inode_init_once(&ei->vfs_inode);
 }