linux-kernel - Re: [PATCH 3/7] lib/random32.c: Replace an #ifdef with a stub prandom_state

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Date:	Sun, 08 Jun 2014 14:16:13 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	George Spelvin <linux@...izon.com>
CC:	davem@...emloft.net, shemminger@...l.org, tytso@....edu,
	linux-kernel@...r.kernel.org, hannes@...essinduktion.org
Subject: Re: [PATCH 3/7] lib/random32.c: Replace an #ifdef with a stub prandom_state_selftest()

On 06/07/2014 10:22 AM, George Spelvin wrote:
> The preferred Linux style for optional features is to define
> no-op stub functions rather than wrap each call site in #ifdef.
>
> Signed-off-by: George Spelvin <linux@...izon.com>
> ---
>   lib/random32.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/random32.c b/lib/random32.c
> index 2e7c15c0..e8f3557b 100644
> --- a/lib/random32.c
> +++ b/lib/random32.c
> @@ -40,6 +40,8 @@
>
>   #ifdef CONFIG_RANDOM32_SELFTEST
>   static void __init prandom_state_selftest(void);
> +#else
> +#define prandom_state_selftest() (void)0

Fine by me. I think you can remove this '(void)0' here, though.

>   #endif
>
>   static DEFINE_PER_CPU(struct rnd_state, net_rand_state);
> @@ -188,9 +190,7 @@ static int __init prandom_init(void)
>   {
>   	int i;
>
> -#ifdef CONFIG_RANDOM32_SELFTEST
>   	prandom_state_selftest();
> -#endif
>
>   	for_each_possible_cpu(i) {
>   		struct rnd_state *state = &per_cpu(net_rand_state,i);
>
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