Re: [PATCH 1/5] lib: introduce call_once()

[Joe Perches]

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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