linux-kernel - Re: [PATCH] avoid ifdefs in desc.h, getting rid of pack_ldt and pack

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Date:	Thu, 13 Dec 2007 21:37:02 +0000
From:	"Tom Spink" <tspink@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Glauber de Oliveira Costa" <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, ehabkost@...hat.com,
	jeremy@...p.org, avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
	zach@...are.com, roland@...hat.com
Subject: Re: [PATCH] avoid ifdefs in desc.h, getting rid of pack_ldt and pack_tss

On Dec 13, 2007 9:26 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Ingo Molnar wrote:
> >
> >> could we _please_ use basic tools as vmlinux size comparison and
> >> objcompare when unifying, to make sure it's a 100% identity
> >> conversion?
> >
> > case in point, the patch claims:
> >
> >>> No functional change is made.
> >
> > but vmlinux before/after size comparison shows:
> >
> >     text    data     bss     dec     hex filename
> >  8802894 1224910 3526656 13554460         ced31c vmlinux.before
> >  8803042 1224910 3526656 13554608         ced3b0 vmlinux.after
> >
>
> Well, "no functional changes" is not quite the same thing as "no object
> code changes".
>
>         -hpa
>
> --
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>

I'm by far no expert on the subject, but after a quick eyes-debug,
have you got the size and type parameters reversed here:

+       set_tssldt_descriptor(&tss, (unsigned long)addr,
               IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1,
               DESC_TSS);

Should DESC_TSS be the parameter before that big size equation?

-- 
Regards,
Tom Spink
University of Edinburgh
--
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