linux-kernel - Re: [KJ][RFC][PATCH] BIT macro cleanup

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Message-Id: <200702242239.33314.dtor@insightbb.com>
Date:	Sat, 24 Feb 2007 22:39:32 -0500
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	linux-joystick@...ey.karlin.mff.cuni.cz
Cc:	Richard Knutsson <ricknu-0@...dent.ltu.se>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Milind Choudhary <milindchoudhary@...il.com>,
	kernel-janitors@...ts.osdl.org, linux-kernel@...r.kernel.org,
	linux-input@...ey.karlin.mff.cuni.cz
Subject: Re: [KJ][RFC][PATCH] BIT macro cleanup

On Saturday 24 February 2007 07:59, Richard Knutsson wrote:
> Vojtech Pavlik wrote:
> > On Fri, Feb 23, 2007 at 11:43:44PM +0100, Richard Knutsson wrote:
> >
> >   
> >> Is the reason for the modulo to put a bitmask larger then the variable 
> >> into an array?
> >>     
> >
> > The complementary LONG() macro will tell you the index of an array of
> > longs where the bit should be set.
> >   
> This may be a little OT, but how come it is not done as an function? 
> Maybe something like "(set/get)_long_mask(...)".

We have it. Is is called set_bit (or __set_bit) and works wery well for
single bit operations, but sometimes it is nice to be able to write

	a = BIT(b) | BIT(c); 

-- 
Dmitry
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