linux-kernel - Re: [PATCH] net: bridge: Fix jump

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Message-ID: <1cf51ae7-3bce-3b9f-f6aa-c20499eedf7a@huawei.com>
Date:   Fri, 26 Feb 2021 09:39:15 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
CC:     Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: bridge: Fix jump_label config


On 2021/2/26 5:22, Cong Wang wrote:
> On Wed, Feb 24, 2021 at 8:03 AM Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>> HAVE_JUMP_LABLE is removed by commit e9666d10a567 ("jump_label: move
>> 'asm goto' support test to Kconfig"), use CONFIG_JUMP_LABLE instead
>> of HAVE_JUMP_LABLE.
>>
>> Fixes: 971502d77faa ("bridge: netfilter: unroll NF_HOOK helper in bridge input path")
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> Hmm, why do we have to use a macro here? static_key_false() is defined
> in both cases, CONFIG_JUMP_LABEL=y or CONFIG_JUMP_LABEL=n.

It seems that all nf_hooks_needed related are using the macro,

see net/netfilter/core.c and include/linux/netfilter.h,

   #ifdef CONFIG_JUMP_LABEL
   struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
EXPORT_SYMBOL(nf_hooks_needed);
#endif

   nf_static_key_inc()/nf_static_key_dec()


>
> Thanks.
>