[PATCH 1/6] writeback: initial tracing support

[Christoph Hellwig]

On Thu, May 27, 2010 at 02:32:33PM -0700, Andrew Morton wrote:
> > +#define inode_to_bdi(inode)	((inode)->i_mapping->backing_dev_info)
> 
> Could/should be implemented in C.
> 
> > +/*
> > + * We don't actually have pdflush, but this one is exported though /proc...
> > + */
> > +int nr_pdflush_threads;
> 
> So this is always zero now?
> 
> We don't want to keep it forever.  Add a
> printk_once("nr_pdflush_threads is deprecated") when someone reads it,
> remove it in 2014.

These two lines are just moved down a bit by the patch, I think any
cleanups should be left to separate patches.