linux-kernel - Re: [PATCH] get rid of the last symlink in uml build

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Message-ID: <20081217091058.GB28946@ZenIV.linux.org.uk>
Date:	Wed, 17 Dec 2008 09:10:58 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	jdike@...toit.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] get rid of the last symlink in uml build

On Wed, Dec 17, 2008 at 09:55:39AM +0100, Sam Ravnborg wrote:

> > AFAICS, having archprepare depend on user_constants.h and kern_constants.h
> > would do just fine.  Note that we don't care how these two are ordered;
> > it's asm-offsets.h that can't be created without user_constants.h.
> 
> Agreed.
> 
> Previously we had some race issues in the arch Makefile when they used
> the prepare target and they were workaround in various ways.
> This was why we introduced archprepare in the first place IIRC.
> And I also recall that um was starnge but this is all cleaned up now - good.

FWIW, how do you plan to deal with include/asm once everything gets moved
to arch/*/include/asm?

Right now O=... builds create asm-offsets.h in $(objtree)/include/asm; do
you plan to take it to $(objtree)/arch/$(ARCH)/include/asm?

Another bloody annoying thing is dangling include2/asm on such builds, along
with include/asm-x86 created on non-O=.. ones.

If/when we stop doing that and just put asm-offsets.h into arch/*/include/asm
we'll need to update the rule for kern_constants.h to
$(SHARED_HEADERS)/kern_constants.h:
	$(Q)mkdir -p $(dir $@)
	$(Q)echo '#include "../asm/asm-offsets.h"' >$@
Not a big deal, just something that'll need to be taken care of when we
switch...
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