linux-kernel - Re: [q] kbuild for private asm-offsets (Re: [PATCH 6/10] lguest code: the little linux hypervisor.)

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Message-ID: <20070212214128.GA11955@uranus.ravnborg.org>
Date:	Mon, 12 Feb 2007 22:41:28 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@....de>,
	virtualization@...ts.osdl.org,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [q] kbuild for private asm-offsets (Re: [PATCH 6/10] lguest code: the little linux hypervisor.)

> 
> If you will have time for newbie, to explain in a few words, what is it need
> for (whole idea, or key detail), and, maybe, why it is generated so ... interestingly:
> 
>             asm-offsets.c -> *.s -> *.h
>  (but this looks like interconnecting C and assembler, obviously)

Correct - asm-offsets is used to transfer constants for .c to assembler,
which us especially convinient for constant that differ when a stuct
is changed.

> 
> I will glad to help providing solution maybe somewhat earlier (well, i'm
> trying to understand whole building process, if that matters).

Basically what is requested is to move the generic parts of asm-offsets
generation from top-level Kbuild file to a generic file somewhere.

Since this is not generic Kbuild functionality but more specific to the
kernel it should not be part of Kbuild generic files.
include/asm-generic/asm-offsets seems to be a fair place for it.

It would contain the sed-y parts as well as cmd_offsets definition.

I would be glad if you could give that a spin.

	Sam
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