linux-kernel - Re: [PATCH] LoongArch: Make -mstrict-align be configurable

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Message-ID: <924aa802-410d-a85c-b623-7ca30d15c637@loongson.cn>
Date:   Tue, 7 Feb 2023 21:28:41 +0800
From:   Jianmin Lv <lvjianmin@...ngson.cn>
To:     Arnd Bergmann <arnd@...db.de>, WANG Xuerui <kernel@...0n.name>,
        David Laight <David.Laight@...LAB.COM>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>, guoren <guoren@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] LoongArch: Make -mstrict-align be configurable



On 2023/2/7 下午6:32, Arnd Bergmann wrote:
> I agree the default should always be to have a kernel that works on
> every machine that has been produced, but this also depends on which
> models specifically lack the unaligned access. If it's just about
> pre-production silicon that is now all but scrapped, things are different
> from a situation where users may actually use them for normal workloads.
> 
> Is there an overview of the available loongarch CPU cores that have
> been produced so far, and which ones support unaligned access?

So far, produced CPUs based LoongArch include 3A5000, 3B5000, 3C5000L, 
3C5000, 2K2000, 2K1000LA and 2K0500, where 2K1000LA and 2K0500 are 
unaligned-access-unsupported, and others are unaligned-access-supported.