Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: Re: [PATCH v4 0/4] LoongArch: Support new relocation types
To:     Xi Ruoyao <xry111@xry111.site>, loongarch@lists.linux.dev
References: <32a74a218c76611f897fd1df1ad0059068621133.camel@xry111.site>
 <ec52fd49-4a30-15d9-3d32-fd7bc6d8b3f0@loongson.cn>
 <0179679b736aea7258981dec2d83107cce74dfc1.camel@xry111.site>
 <a139a8475fe295ac9f17064269cd0312dca6f96e.camel@xry111.site>
 <6b5d2188f93ed72b67a4bbb7116113f833fe1ee5.camel@xry111.site>
Cc:     linux-kernel@vger.kernel.org, WANG Xuerui <kernel@xen0n.name>,
        Huacai Chen <chenhuacai@kernel.org>,
        Jinyang He <hejinyang@loongson.cn>,
        Lulu Cheng <chenglulu@loongson.cn>
From:   Youling Tang <tangyouling@loongson.cn>
Message-ID: <d7670b60-2782-4642-995b-7baa01779a66@loongson.cn>
Date:   Fri, 29 Jul 2022 20:19:56 +0800
User-Agent: Mozilla/5.0 (X11; Linux mips64; rv:45.0) Gecko/20100101
 Thunderbird/45.4.0
MIME-Version: 1.0
In-Reply-To: <6b5d2188f93ed72b67a4bbb7116113f833fe1ee5.camel@xry111.site>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk


On 07/29/2022 07:45 PM, Xi Ruoyao wrote:
> On Fri, 2022-07-29 at 18:36 +0800, Xi Ruoyao wrote:
>
>> The relocation against local percpu variable is broken up.  I'll try
>> to fix it.
>
> Hmm... The problem is the "addresses" of per-cpu symbols are faked: they
> are actually offsets from $r21.  So we can't just load such an offset
> with PCALA addressing.
>
> It looks like we'll need to introduce an attribute for GCC to make an
> variable "must be addressed via GOT", and add the attribute into
> PER_CPU_ATTRIBUTES.
Yes, we need a GCC attribute to specify the per-cpu variable.

Thanks,
Youling
>