linux-kernel - Re: [PATCH] static_call: Fix unused variable warning

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Date:   Wed, 21 Apr 2021 20:41:39 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] static_call: Fix unused variable warning


Second patch with the exact same update. Perhaps we should take one
before we get more of them ;-)

https://lore.kernel.org/lkml/20210416194300.3952208-1-cmllamas@google.com/

-- Steve


On Wed, 21 Apr 2021 17:33:34 -0700
Guenter Roeck <linux@...ck-us.net> wrote:

> If CONFIG_MODULES=n, the following build warning is reported.
> 
> kernel/static_call.c: In function ‘__static_call_update’:
> kernel/static_call.c:153:18: warning: unused variable ‘mod’
> 
> Mark the variable as __maybe_unused to fix the problem.
> 
> Fixes: 9183c3f9ed71 ("static_call: Add inline static call infrastructure")
> Reported-by: Zach Reizner <zachr@...gle.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  kernel/static_call.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/static_call.c b/kernel/static_call.c
> index 2c5950b0b90e..8211a34251f8 100644
> --- a/kernel/static_call.c
> +++ b/kernel/static_call.c
> @@ -150,7 +150,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
>  
>  	for (site_mod = &first; site_mod; site_mod = site_mod->next) {
>  		bool init = system_state < SYSTEM_RUNNING;
> -		struct module *mod = site_mod->mod;
> +		struct module __maybe_unused *mod = site_mod->mod;
>  
>  		if (!site_mod->sites) {
>  			/*