linux-kernel - Re: Checking to see if a bit is _not

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Message-ID: <20141201225725.1e94aa66@gandalf.local.home>
Date:	Mon, 1 Dec 2014 22:57:25 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Checking to see if a bit is _not_ set in a ftrace event filter

On Mon, 1 Dec 2014 19:52:11 -0800
Alexei Starovoitov <ast@...mgrid.com> wrote:

> yeah. teaching tree walk to do (state & 2048) == 0 is not trivial,
> since it doesn't have a concept of value of expression.
> Doing !(state & 2048) is probably a bit easier, since there
> are hacks for 'not' already.

That's exactly what I was looking at doing. If I can get something
working without spending more than an hour or two, I may even push it
for this release cycle.

-- Steve

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