Subject: Re: linux-next: build failure after merge of the akpm tree

From: Andrew Morton <[email-masked]>
Date: Tue, 23 Oct 2012 13:02:34 -0700

On Tue, 23 Oct 2012 12:51:29 -0700
Joe Perches <[email-masked]> wrote:

> > btw, what's up with printk_syslog.h?  It includes two header files which it
> > doesn't need but fails to include the two it *does* need: printk_log.h
> > and types.h.
> > 
> > 
> 
> printk_syslog.c includes kernel.h (it includes types.h)
> and printk_log.h.
> 
> I think printk_syslog.h doesn't need printk_log.h

A general rule is that the header file shouldn't know or care what else
it's includer has included.  Ideally it shouldn't know or care what
else its includees have included, either.

A fun test would be

for i in *.h
	echo $i > foo.c
	make foo.o
done