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

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Date:   Wed, 8 Jan 2020 18:48:26 +0800
From:   Shile Zhang <shile.zhang@...ux.alibaba.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc:     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

Hi Arnd,

Thanks for you work!
But sorry for I have been fix this warning via a delta-patch as following:
https://lore.kernel.org/lkml/157838258393.30329.5371781726464192052.tip-bot2@tip-bot2/

FYI.

BRs
Shile

On 2020/1/8 05:31, Arnd Bergmann 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>
> ---
>   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)
>   {