linux-kernel - Re: [PATCH] x86: orc: fix unused-function warning

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Message-Id: <20200108095816.76dd48134cadc997bf4c5ece@kernel.org>
Date:   Wed, 8 Jan 2020 09:58:16 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Shile Zhang <shile.zhang@...ux.alibaba.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jann Horn <jannh@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: orc: fix unused-function warning

On Tue,  7 Jan 2020 22:31:20 +0100
Arnd Bergmann <arnd@...db.de> wrote:

> The orc unwinder contains a new warning:
> 
> arch/x86/kernel/unwind_orc.c:210:12: error: 'orc_sort_cmp' defined but not used [-Werror=unused-function]
>  static int orc_sort_cmp(const void *_a, const void *_b)
>             ^~~~~~~~~~~~
> arch/x86/kernel/unwind_orc.c:190:13: error: 'orc_sort_swap' defined but not used [-Werror=unused-function]
>  static void orc_sort_swap(void *_a, void *_b, int size)
>              ^~~~~~~~~~~~~
> 
> Move the #ifdef to hide the now unused functions.
> 
> Fixes: f14bf6a350df ("x86/unwind/orc: Remove boot-time ORC unwind tables sorting")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Looks good to me.

Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you,

> ---
>  arch/x86/kernel/unwind_orc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
> index abdf8911a1fb..538152cca46b 100644
> --- a/arch/x86/kernel/unwind_orc.c
> +++ b/arch/x86/kernel/unwind_orc.c
> @@ -187,6 +187,7 @@ static struct orc_entry *orc_find(unsigned long ip)
>  	return orc_ftrace_find(ip);
>  }
>  
> +#ifdef CONFIG_MODULES
>  static void orc_sort_swap(void *_a, void *_b, int size)
>  {
>  	struct orc_entry *orc_a, *orc_b;
> @@ -229,7 +230,6 @@ static int orc_sort_cmp(const void *_a, const void *_b)
>  	return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1;
>  }
>  
> -#ifdef CONFIG_MODULES
>  void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
>  			void *_orc, size_t orc_size)
>  {
> -- 
> 2.20.0
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>