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Date: Mon, 20 Sep 2021 14:14:10 -0700 From: Richard Henderson <rth@...ddle.net> To: Huacai Chen <chenhuacai@...il.com>, Arnd Bergmann <arnd@...db.de> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, Huacai Chen <chenhuacai@...ngson.cn>, Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, David Airlie <airlied@...ux.ie>, Jonathan Corbet <corbet@....net>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-arch <linux-arch@...r.kernel.org>, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Xuefeng Li <lixuefeng@...ngson.cn>, Yanteng Si <siyanteng@...ngson.cn>, Jiaxun Yang <jiaxun.yang@...goat.com> Subject: Re: [PATCH V3 14/22] LoongArch: Add signal handling support On 9/19/21 7:36 PM, Huacai Chen wrote: > Hi, Arnd, > > On Sun, Sep 19, 2021 at 5:59 PM Arnd Bergmann <arnd@...db.de> wrote: >> >> On Sat, Sep 18, 2021 at 9:12 AM Huacai Chen <chenhuacai@...il.com> wrote: >>> On Sat, Sep 18, 2021 at 5:10 AM Eric W. Biederman <ebiederm@...ssion.com> wrote: >>>> For example does LoongArch have a version without built in floating >>>> point support? >>> >>> Some of these structures seems need rethinking, But we really have >>> LoongArch-based MCUs now (no FP, no SMP, and even no MMU). >> >> NOMMU Linux is kind-of on the way out as interest is fading, so I hope you >> don't plan on supporting this in the future. >> >> Do you expect to see future products with MMU but no FP or no SMP? > OK, we will not care no-MMU hardware in Linux, but no-FP and no-SMP > hardware will be supported. Please consider requiring the FP registers to be present even on no-FP hardware. With this plus the FP data movement instructions (FMOV, MOVGR2FR, MOVFR2GR, FLD, FST), it is possible to implement soft-float without requiring a separate soft-float ABI. This can vastly simplify compatibility and deployment. r~
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