From 50953fe9e00ebbeffa032a565ab2f08312d51a87 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sun, 6 May 2007 14:50:16 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/smbfs/inode.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'fs/smbfs') diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c index 5faba4f1c9a..424a3ddf86d 100644 --- a/fs/smbfs/inode.c +++ b/fs/smbfs/inode.c @@ -69,9 +69,8 @@ static void smb_destroy_inode(struct inode *inode) static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) { struct smb_inode_info *ei = (struct smb_inode_info *) foo; - unsigned long flagmask = SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR; - if ((flags & flagmask) == SLAB_CTOR_CONSTRUCTOR) + if (flags & SLAB_CTOR_CONSTRUCTOR) inode_init_once(&ei->vfs_inode); } -- cgit v1.2.3-70-g09d2