linux-kernel - Re: [PATCH v2 0/4] LoongArch: Support new relocation types

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Message-ID: <b4e9c57b4e863cc105fbf9a8e6bbfc1407ee35ca.camel@xry111.site>
Date:   Thu, 28 Jul 2022 22:05:34 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Huacai Chen <chenhuacai@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc:     loongarch@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Youling Tang <tangyouling@...ngson.cn>,
        Jinyang He <hejinyang@...ngson.cn>
Subject: Re: [PATCH v2 0/4] LoongArch: Support new relocation types

On Thu, 2022-07-28 at 20:33 +0800, Huacai Chen wrote:
> Hi, Arnd,

/* snip */

> Could you update the cross-compilers here [1] to make this series be
> possible upstream in the 5.20 cycle? Or we can only do that until new
> binutils/gcc be released?

Hi Huacai and Arnd,

The old toolchain will use

    R_LARCH_PUSH_PCREL _GLOBAL_OFFSET_TABLE_
    R_LARCH_PUSH_GPREL symbol
    R_LARCH_ADD

to perform a PC-relative addressing for a GOT entry, and the new
toolchain will use R_LARCH_GOT_PC_{HI20,LO12}.  Both way are supported
by this series.

I've tested the V3 patch (V2 + suggestions from Youling, I'll sent it
later after rewording the third patch) with both my system toolchain (no
new reloc support) and a toolchain built from binutils & gcc master. 
Both of the build works fine.

So a toolchain update seems not immediately required.
-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University