linux-kernel - Re: [PATCH] x86/unwind/orc: fix unused function warnings

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Date:   Tue, 28 Apr 2020 16:43:34 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Miroslav Benes <mbenes@...e.cz>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>, Dave Jones <dsj@...com>,
        Jann Horn <jannh@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Shile Zhang <shile.zhang@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/unwind/orc: fix unused function warnings

On Tue, Apr 28, 2020 at 11:36:09PM +0200, Arnd Bergmann wrote:
> Without CONFIG_MODULES, these two variables are unused:
> 
> arch/x86/kernel/unwind_orc.c:29:26: error: 'cur_orc_table' defined but not used [-Werror=unused-variable]
>    29 | static struct orc_entry *cur_orc_table = __start_orc_unwind;
>       |                          ^~~~~~~~~~~~~
> arch/x86/kernel/unwind_orc.c:28:13: error: 'cur_orc_ip_table' defined but not used [-Werror=unused-variable]
>    28 | static int *cur_orc_ip_table = __start_orc_unwind_ip;
>       |             ^~~~~~~~~~~~~~~~
> 
> Move them into the #ifdef section.
> 
> Fixes: 153eb2223c79 ("x86/unwind/orc: Convert global variables to static")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I posted a similar patch yesterday (I also moved the mutex; not sure why
GCC didn't complain about that one).

https://lkml.kernel.org/r/20200428071640.psn5m7eh3zt2in4v@treble

> ---
>  arch/x86/kernel/unwind_orc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
> index 0ebc11a8bb45..ea8f2aba663f 100644
> --- a/arch/x86/kernel/unwind_orc.c
> +++ b/arch/x86/kernel/unwind_orc.c
> @@ -25,8 +25,6 @@ static bool orc_init __ro_after_init;
>  static unsigned int lookup_num_blocks __ro_after_init;
>  
>  static DEFINE_MUTEX(sort_mutex);
> -static int *cur_orc_ip_table = __start_orc_unwind_ip;
> -static struct orc_entry *cur_orc_table = __start_orc_unwind;
>  
>  static inline unsigned long orc_ip(const int *ip)
>  {
> @@ -191,6 +189,8 @@ static struct orc_entry *orc_find(unsigned long ip)
>  }
>  
>  #ifdef CONFIG_MODULES
> +static int *cur_orc_ip_table = __start_orc_unwind_ip;
> +static struct orc_entry *cur_orc_table = __start_orc_unwind;
>  
>  static void orc_sort_swap(void *_a, void *_b, int size)
>  {
> -- 
> 2.26.0
> 

-- 
Josh