From: Huacai Chen <chenhuacai@gmail.com>
To: Richard Henderson <rth@twiddle.net>
Cc: Arnd Bergmann <arnd@arndb.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Huacai Chen <chenhuacai@loongson.cn>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Airlie <airlied@linux.ie>, Jonathan Corbet <corbet@lwn.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-arch <linux-arch@vger.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Xuefeng Li <lixuefeng@loongson.cn>,
Yanteng Si <siyanteng@loongson.cn>,
Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH V3 14/22] LoongArch: Add signal handling support
Date: Wed, 22 Sep 2021 10:43:09 +0800 [thread overview]
Message-ID: <CAAhV-H5h9zNCmsOumR=_Bryj3-Qarbq7FH=uYbT_3++-8pwfPw@mail.gmail.com> (raw)
In-Reply-To: <a0fb870d-3b79-ca77-305f-6178974729e4@twiddle.net>
Hi, Richard,
On Tue, Sep 21, 2021 at 5:14 AM Richard Henderson <rth@twiddle.net> wrote:
>
> On 9/19/21 7:36 PM, Huacai Chen wrote:
> > Hi, Arnd,
> >
> > On Sun, Sep 19, 2021 at 5:59 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >>
> >> On Sat, Sep 18, 2021 at 9:12 AM Huacai Chen <chenhuacai@gmail.com> wrote:
> >>> On Sat, Sep 18, 2021 at 5:10 AM Eric W. Biederman <ebiederm@xmission.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.
OK, I'll send an updated version.
>
>
> r~
next prev parent reply other threads:[~2021-09-22 2:43 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 3:57 [PATCH V3 00/22] arch: Add basic LoongArch support Huacai Chen
2021-09-17 3:57 ` [PATCH V3 01/22] Documentation: LoongArch: Add basic documentations Huacai Chen
2021-09-23 20:37 ` Pavel Machek
2021-09-24 4:07 ` Huacai Chen
2021-09-23 20:59 ` Pavel Machek
2021-09-24 4:10 ` Huacai Chen
2021-09-24 6:58 ` Pavel Machek
2021-09-24 7:31 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 02/22] Documentation/zh_CN: Add basic LoongArch documentations Huacai Chen
2021-09-17 3:57 ` [PATCH V3 03/22] LoongArch: Add elf-related definitions Huacai Chen
2021-09-17 3:57 ` [PATCH V3 04/22] LoongArch: Add writecombine support for drm Huacai Chen
2021-09-17 3:57 ` [PATCH V3 05/22] LoongArch: Add build infrastructure Huacai Chen
2021-09-17 7:53 ` Arnd Bergmann
2021-09-18 4:35 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 06/22] LoongArch: Add CPU definition headers Huacai Chen
2021-09-17 3:57 ` [PATCH V3 07/22] LoongArch: Add atomic/locking headers Huacai Chen
2021-09-17 3:57 ` [PATCH V3 08/22] LoongArch: Add other common headers Huacai Chen
2021-09-17 3:57 ` [PATCH V3 09/22] LoongArch: Add boot and setup routines Huacai Chen
2021-09-17 8:11 ` Arnd Bergmann
2021-09-18 4:54 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 10/22] LoongArch: Add exception/interrupt handling Huacai Chen
2021-09-17 3:57 ` [PATCH V3 11/22] LoongArch: Add process management Huacai Chen
2021-09-17 3:57 ` [PATCH V3 12/22] LoongArch: Add memory management Huacai Chen
2021-09-17 3:57 ` [PATCH V3 13/22] LoongArch: Add system call support Huacai Chen
2021-09-17 8:24 ` Arnd Bergmann
2021-09-18 6:55 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 14/22] LoongArch: Add signal handling support Huacai Chen
2021-09-17 8:26 ` Arnd Bergmann
2021-09-17 21:10 ` Eric W. Biederman
2021-09-18 7:12 ` Huacai Chen
2021-09-19 9:58 ` Arnd Bergmann
2021-09-20 2:36 ` Huacai Chen
2021-09-20 21:14 ` Richard Henderson
2021-09-22 2:43 ` Huacai Chen [this message]
2021-09-17 3:57 ` [PATCH V3 15/22] LoongArch: Add elf and module support Huacai Chen
2021-09-17 8:28 ` Arnd Bergmann
2021-09-18 7:14 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 16/22] LoongArch: Add misc common routines Huacai Chen
2021-09-17 6:10 ` Christoph Hellwig
2021-09-17 6:36 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 17/22] LoongArch: Add some library functions Huacai Chen
2021-09-17 8:33 ` Arnd Bergmann
2021-09-18 7:16 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 18/22] LoongArch: Add PCI controller support Huacai Chen
2021-09-17 9:02 ` Arnd Bergmann
2021-09-18 7:36 ` Huacai Chen
2021-09-21 22:36 ` Bjorn Helgaas
2021-09-22 15:33 ` Arnd Bergmann
2021-09-17 3:57 ` [PATCH V3 19/22] LoongArch: Add VDSO and VSYSCALL support Huacai Chen
2021-09-17 3:57 ` [PATCH V3 20/22] LoongArch: Add multi-processor (SMP) support Huacai Chen
2021-09-17 9:57 ` Arnd Bergmann
2021-09-18 7:22 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support Huacai Chen
2021-09-17 6:15 ` Christoph Hellwig
2021-09-17 6:40 ` Huacai Chen
2021-09-17 3:57 ` [PATCH V3 22/22] LoongArch: Add Loongson-3 default config file Huacai Chen
2021-09-17 9:59 ` [PATCH V3 00/22] arch: Add basic LoongArch support Arnd Bergmann
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