linux-kernel - Re: [PATCH 6/9] drivers/net/wireless/iwlwifi/iwl-4965.c: Correct use of ! and &

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Date:	Tue, 04 Mar 2008 23:09:55 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christopher Li <sparse@...isli.org>, Julia Lawall <julia@...u.dk>,
	yi.zhu@...el.com, linux-wireless@...r.kernel.org,
	ipw3945-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Alexander Viro <viro@....linux.org.uk>,
	linux-sparse@...r.kernel.org, Josh Triplett <josh@...edesktop.org>
Subject: Re: [PATCH 6/9] drivers/net/wireless/iwlwifi/iwl-4965.c: Correct
	use of ! and &

On Wed, 2008-03-05 at 08:02 +0100, Ingo Molnar wrote:
> * Christopher Li <sparse@...isli.org> wrote:
> 
> > I think Al Viro has sent a patch to linux-sparse with subject "[PATCH 
> > 3/3] catch !x & y brainos" does exactly that.
> 
> ah - nice :-)
> 
> /me checks the linux-sparse archive
> 
> Al's patch is:
> 
> +                       if (op == '&' && expr->left->type == EXPR_PREOP &&
> +                           expr->left->op == '!')
> +                               warning(expr->pos, "dubious: !x & y");
> 
> i think there might be similar patterns: "x & !y", "!x | y", "x | !y" ?
> 

Well, (!x & y) and (!x | y) are probably the two that might have been
intended otherwise.  (x & !y), (x | !y) are probably ok.

Harvey

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