On 12/19/07, David Chinner <dgc@sgi.com> wrote:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7cd94146cd504016315608e297219f9fb7b1413b
>
> included security.h in mm.h and that is how I'm seeing the namespace
> poisoning coming from key.h when !CONFIG_KEY.
>
> Including security.h in mm.h means much wider includes for pretty
> much the entire kernel, and it opens up namespace issues like this
> that never previously existed.

ACK, removing sched.h from mm.h was quite painful and security.h
added it back unconditionally. As result, standalone mm.h inclusion goes
from ~9K to ~16K of code after preprocessing which is quite unpleasant.

> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -12,7 +12,6 @@
>  #include <linux/prio_tree.h>
>  #include <linux/debug_locks.h>
>  #include <linux/mm_types.h>
> -#include <linux/security.h>