linux-kernel - Re: [PATCH] bpf: fix sysctl.c warning

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Date:   Mon, 4 Mar 2019 20:58:59 +0000
From:   Song Liu <songliubraving@...com>
To:     Christian Brauner <christian@...uner.io>
CC:     Arnd Bergmann <arnd@...db.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "Kees Cook" <keescook@...omium.org>,
        Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH] bpf: fix sysctl.c warning



> On Mar 4, 2019, at 12:57 PM, Christian Brauner <christian@...uner.io> wrote:
> 
> On Mon, Mar 04, 2019 at 09:34:12PM +0100, Arnd Bergmann wrote:
>> When CONFIG_BPF_SYSCALL or CONFIG_SYSCTL is disabled, we get
>> a warning about an unused function:
>> 
>> kernel/sysctl.c:3331:12: error: 'proc_dointvec_minmax_bpf_stats' defined but not used [-Werror=unused-function]
>> static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
>> 
>> The CONFIG_BPF_SYSCALL check was already handled, but the SYSCTL check
>> is needed on top.
>> 
>> Fixes: 492ecee892c2 ("bpf: enable program stats")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Reviewed-by: Christian Brauner <christian@...uner.io>

Acked-by: Song Liu <songliubraving@...com>

> 
>> ---
>> kernel/sysctl.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
>> index 46a0d0a14a66..b3df3ab7ac28 100644
>> --- a/kernel/sysctl.c
>> +++ b/kernel/sysctl.c
>> @@ -3330,7 +3330,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
>> 
>> #endif /* CONFIG_PROC_SYSCTL */
>> 
>> -#ifdef CONFIG_BPF_SYSCALL
>> +#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
>> static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
>> 					  void __user *buffer, size_t *lenp,
>> 					  loff_t *ppos)
>> -- 
>> 2.20.0
>>