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

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Message-ID: <20080305070201.GA32434@elte.hu>
Date:	Wed, 5 Mar 2008 08:02:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christopher Li <sparse@...isli.org>
Cc:	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,
	Harvey Harrison <harvey.harrison@...il.com>,
	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 &


* 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" ?

	Ingo
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