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From: Xi Ruoyao <xry111@xry111.site>
To: Youling Tang <tangyouling@loongson.cn>, loongarch@lists.linux.dev
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>
Subject: Re: [PATCH v4 0/4] LoongArch: Support new relocation types
Date: Sat, 30 Jul 2022 01:55:29 +0800	[thread overview]
Message-ID: <7cad6e78014168a8906e130e1cf3809077d2bda7.camel@xry111.site> (raw)
In-Reply-To: <d7670b60-2782-4642-995b-7baa01779a66@loongson.cn>

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

This fixes "modprobe x_tables" for me.
-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University

  reply	other threads:[~2022-07-29 17:55 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-29  8:38 [PATCH v4 0/4] LoongArch: Support new relocation types Xi Ruoyao
2022-07-29  8:39 ` [PATCH v4 1/4] LoongArch: Add section of GOT for kernel module Xi Ruoyao
2022-07-29  8:40 ` [PATCH v4 2/4] LoongArch: Support R_LARCH_SOP_PUSH_GPREL relocation type in " Xi Ruoyao
2022-07-29  8:41 ` [PATCH v4 3/4] LoongArch: Remove -fplt and -Wa,-mla-* from CFLAGS Xi Ruoyao
2022-07-29  8:42 ` [PATCH v4 4/4] LoongArch: Support modules with new relocation types Xi Ruoyao
2022-08-01  9:45   ` Youling Tang
2022-08-09 11:31   ` Youling Tang
2022-07-29  9:47 ` [PATCH v4 0/4] LoongArch: Support " WANG Xuerui
2022-07-29  9:49 ` Youling Tang
2022-07-29 10:18   ` Xi Ruoyao
2022-07-29 10:36     ` Xi Ruoyao
2022-07-29 11:45       ` Xi Ruoyao
2022-07-29 12:19         ` Youling Tang
2022-07-29 17:55           ` Xi Ruoyao [this message]
2022-07-30  2:24             ` Xi Ruoyao
2022-07-30  2:52               ` Xi Ruoyao
2022-07-30  6:14                 ` Huacai Chen
     [not found]                   ` <674cb3e9-d820-016b-a210-afd37ed6e25e@loongson.cn>
2022-07-30  9:51                     ` Xi Ruoyao
2022-07-30 10:38                       ` Huacai Chen
2022-07-31  3:07                         ` Xi Ruoyao
2022-08-01  2:16                 ` Youling Tang
2022-08-01  2:34                   ` Huacai Chen
2022-08-01  4:31                     ` Youling Tang
2022-08-01  9:55                     ` Xi Ruoyao
2022-08-01 10:08                       ` Jinyang He
2022-08-01 10:44                         ` WANG Xuerui
2022-08-01 11:28                         ` Youling Tang
2022-08-01 11:39                           ` Xi Ruoyao
2022-08-01 12:09                             ` Huacai Chen
2022-08-01 12:13                             ` Youling Tang
     [not found]                               ` <98efbf76-fbf3-f90b-82d4-bd2874088d05@loongson.cn>
2022-08-02  7:15                                 ` Xi Ruoyao
2022-08-27 13:20                                   ` Huacai Chen
2022-08-01 10:41                       ` Huacai Chen

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