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

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Message-ID: <1d0783b87bda3e454a111862fcc5b5faffcb16b0.camel@xry111.site>
Date:   Sat, 30 Jul 2022 10:24:19 +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 Sat, 2022-07-30 at 01:55 +0800, Xi Ruoyao wrote:
> On Fri, 2022-07-29 at 20:19 +0800, Youling Tang wrote:
> 
> > On 07/29/2022 07:45 PM, Xi Ruoyao wrote:
> > > 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.
> 
> GCC patch adding "addr_global" attribute for LoongArch:
> https://gcc.gnu.org/pipermail/gcc-patches/2022-July/599064.html
> 
> An experiment to use it:
> https://github.com/xry111/linux/commit/c1d5d70

Correction: https://github.com/xry111/linux/commit/c1d5d708

It seems 7-bit SHA is not enough for kernel repo.

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