linux-kernel - Re: [PATCH 2/8] i386: bitops: Rectify bogus "Ir" constraints

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Message-ID: <Pine.LNX.4.64.0707232338260.22796@cselinux1.cse.iitk.ac.in>
Date:	Mon, 23 Jul 2007 23:44:52 +0530 (IST)
From:	Satyam Sharma <ssatyam@....iitk.ac.in>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/8] i386: bitops: Rectify bogus "Ir" constraints

On Mon, 23 Jul 2007, Linus Torvalds wrote:

> On Mon, 23 Jul 2007, Satyam Sharma wrote:
> >
> > * The "I" constraint modifier is applicable only to immediate-value operands,
> >   and combining it with "r" is bogus.
> 
> This is wrong too.
> 
> The whole point of a "Ir" modifier is to say that the instruction takes 
> *either* an "I" or an "r".

Yup, sorry about this one, Andi pointed this out earlier. But the "I"
must still go I think, for the third reason in that changelog -- it
unnecessarily limits the bit offset to 0..31, but (at least from the
comment up front in that file) we do allow arbitrarily large @nr (upto
255, of course, these instructions won't take anything greater than that).

> Andrew - the ones I've looked at were all wrong. Please don't take this 
> series.

I think I'll rescind the series anyway, a lot of patches turned out to
be wrong -- some due to mis-reading / incorrect gcc docs, others due to
other reasons ... this was just something I did thinking of as a cleanup
anyway, so I don't intend to push or correct this or anything.

Satyam
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