linux-kernel - Re: [PATCH 1/5] lib: introduce call

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Message-Id: <1205261815.3165.21.camel@localhost>
Date:	Tue, 11 Mar 2008 11:56:55 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Akinobu Mita <akinobu.mita@...il.com>, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] lib: introduce call_once()

On Tue, 2008-03-11 at 10:35 -0700, Andrew Morton wrote:
> #define ONCE()                                              \
>     ({                                              \
>             static long flag;                       \
>                                                     \
>             return !test_and_set_bit(0, flag);      \
>     })

test_and_set_bit takes an address

Perhaps:

#define DO_ONCE(x) \
	({ static long flag; if (test_and_set_bit(0, &flag)) x; 1; })

DO_ONCE(foo);

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