Re: [PATCH] shrinks dentry struct

[Andrew Morton <akpm@osdl.org>]

Paul Jackson <pj@sgi.com> wrote:
>
>  Would the following accomplish the same thing as your patch, to shrink
>  UP dentry structs back to 128 bytes, with a smaller and less intrusive
>  patch?
> 
> ...
>  -	struct list_head d_child;	/* child of parent list */
>  +	union {				/* Fit 32 bit UP dentry in 128 bytes */
>  +		struct list_head du_child;	/* child of parent list */
>  + 		struct rcu_head du_rcu;
>  +	} d_du;
> ...
>   
>  +#define d_child d_du.du_child
>  +#define d_rcu d_du.du_rcu

Yes, but it's better to just do the big edit, rather than letting these
little namespace crufties accumulate over time.

Even better would be to ditch gcc-2.95.x and use an anonymous union, but
Hugh won't let me ;)