linux-kernel - Re: [PATCH v4 0/4] LoongArch: Support new relocation types

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Message-ID: <6b5d2188f93ed72b67a4bbb7116113f833fe1ee5.camel@xry111.site>
Date:   Fri, 29 Jul 2022 19:45:07 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Youling Tang <tangyouling@...ngson.cn>, loongarch@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, WANG Xuerui <kernel@...0n.name>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jinyang He <hejinyang@...ngson.cn>,
        Lulu Cheng <chenglulu@...ngson.cn>
Subject: Re: [PATCH v4 0/4] LoongArch: Support new relocation types

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.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University