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

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Message-ID: <4761A6CF.10307@redhat.com>
Date:	Thu, 13 Dec 2007 19:40:31 -0200
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	Tom Spink <tspink@...il.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	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

Tom Spink wrote:
> 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?
> 
That's it. I made this mistake once, and fixed it. But I may have sent 
an older, and obviously wrong version of the patch. My fault.
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