linux-kernel - Re: Alpha: suspicious compiler warning in entry.S

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Message-ID: <4AE8D005.1030302@twiddle.net>
Date:	Wed, 28 Oct 2009 16:13:09 -0700
From:	Richard Henderson <rth@...ddle.net>
To:	Michael Cree <mcree@...on.net.nz>
CC:	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	ink@...assic.park.msu.ru, David Howells <dhowells@...hat.com>
Subject: Re: Alpha: suspicious compiler warning in entry.S

On 10/28/2009 12:03 AM, Michael Cree wrote:
> I am wondering whether it might be better
> to rearrange the bits in the thread information flags so that
> _TIF_WORK_MASK
> has a value less than 255 and the single instruction to perform an and
> operation can be maintained.

It would be better to rearrange TIF_NODIFY_RESUME down to 3.

In fact, you might as well rearrange the ones currently occupying
3-7 up to 8 and leave a hole for _TIF_WORK_MASK expansion, and
add a nice comment there at the same time.


r~
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