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From: Paul Walmsley <paul.walmsley@sifive.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Palmer Dabbelt" <palmer@rivosinc.com>,
	guoren <guoren@kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Conor.Dooley" <conor.dooley@microchip.com>,
	"Heiko Stübner" <heiko@sntech.de>,
	"Jisheng Zhang" <jszhang@kernel.org>,
	"Huacai Chen" <chenhuacai@kernel.org>,
	"Anup Patel" <apatel@ventanamicro.com>,
	"Atish Patra" <atishp@atishpatra.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Björn Töpel" <bjorn@kernel.org>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will@kernel.org>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Anup Patel" <anup@brainfault.org>,
	shihua@iscas.ac.cn, jiawei@iscas.ac.cn, liweiwei@iscas.ac.cn,
	luxufan@iscas.ac.cn, chunyu@iscas.ac.cn, tsu.yubo@gmail.com,
	wefu@redhat.com, wangjunqiang@iscas.ac.cn, kito.cheng@sifive.com,
	"Andy Chiu" <andy.chiu@sifive.com>,
	"Vincent Chen" <vincent.chen@sifive.com>,
	"Greentime Hu" <greentime.hu@sifive.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	wuwei2016@iscas.ac.cn, "Jessica Clarke" <jrtc27@jrtc27.com>,
	Linux-Arch <linux-arch@vger.kernel.org>,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	"Guo Ren" <guoren@linux.alibaba.com>
Subject: Re: [RFC PATCH 00/22] riscv: s64ilp32: Running 32-bit Linux kernel on 64-bit supervisor mode
Date: Thu, 18 May 2023 17:38:50 -0700 (PDT)	[thread overview]
Message-ID: <454dede3-5f20-74fc-975a-e11e4d8b5648@sifive.com> (raw)
In-Reply-To: <556bebad-3150-4fd5-8725-e4973fd6edd1@app.fastmail.com>

On Thu, 18 May 2023, Arnd Bergmann wrote:

> We have had long discussions about supporting ilp32 userspace on
> arm64, and I think almost everyone is glad we never merged it into
> the mainline kernel, so we don't have to worry about supporting it
> in the future. The cost of supporting an extra user space ABI
> is huge, and I'm sure you don't want to go there. The other two
> cited examples (mips-n32 and x86-x32) are pretty much unused now
> as well, but still have a maintenance burden until they can finally
> get removed.

There probably hasn't been much pressure to support Aarch64 ILP32 since 
ARM still has hardware support for Aarch32.  Will be interesting to see if 
that's still the case after ARM drops Aarch32 support for future designs.


- Paul

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  reply	other threads:[~2023-05-19  0:39 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-18 13:09 [RFC PATCH 00/22] riscv: s64ilp32: Running 32-bit Linux kernel on 64-bit supervisor mode guoren
2023-05-18 13:09 ` [RFC PATCH 01/22] riscv: vdso: Unify vdso32 & compat_vdso into vdso/Makefile guoren
2023-05-18 13:09 ` [RFC PATCH 02/22] riscv: vdso: Remove compat_vdso/ guoren
2023-05-18 13:09 ` [RFC PATCH 03/22] riscv: vdso: Add time-related vDSO common flow for vdso32 guoren
2023-05-18 13:09 ` [RFC PATCH 04/22] clocksource: riscv: s64ilp32: Use __riscv_xlen instead of CONFIG_32BIT guoren
2023-05-18 13:09 ` [RFC PATCH 05/22] riscv: s64ilp32: Introduce xlen_t guoren
2023-05-18 13:09 ` [RFC PATCH 06/22] irqchip: riscv: s64ilp32: Use __riscv_xlen instead of CONFIG_32BIT guoren
2023-05-18 13:09 ` [RFC PATCH 07/22] riscv: s64ilp32: Add sbi support guoren
2023-05-18 13:09 ` [RFC PATCH 08/22] riscv: s64ilp32: Add asid support guoren
2023-05-18 13:10 ` [RFC PATCH 09/22] riscv: s64ilp32: Introduce PTR_L and PTR_S guoren
2023-05-18 13:10 ` [RFC PATCH 10/22] riscv: s64ilp32: Enable user space runtime environment guoren
2023-05-18 13:10 ` [RFC PATCH 11/22] riscv: s64ilp32: Add ebpf jit support guoren
2023-05-18 13:10 ` [RFC PATCH 12/22] riscv: s64ilp32: Add ELF32 support guoren
2023-05-18 13:10 ` [RFC PATCH 13/22] riscv: s64ilp32: Add ARCH RV64 ILP32 compiling framework guoren
2023-05-18 13:10 ` [RFC PATCH 14/22] riscv: s64ilp32: Add MMU_SV39 mode support for 32BIT guoren
2023-05-18 13:10 ` [RFC PATCH 15/22] riscv: s64ilp32: Enable native atomic64 guoren
2023-05-18 13:10 ` [RFC PATCH 16/22] riscv: s64ilp32: Add TImode (128 int) support guoren
2023-05-18 13:10 ` [RFC PATCH 17/22] riscv: s64ilp32: Implement cmpxchg_double guoren
2023-05-18 13:10 ` [RFC PATCH 18/22] riscv: s64ilp32: Disable KVM guoren
2023-05-18 13:10 ` [RFC PATCH 19/22] riscv: Cleanup rv32_defconfig guoren
2023-05-18 13:10 ` [RFC PATCH 20/22] riscv: s64ilp32: Add rv64ilp32_defconfig guoren
2023-05-18 13:10 ` [RFC PATCH 21/22] riscv: s64ilp32: Correct the rv64ilp32 stackframe layout guoren
2023-05-18 13:10 ` [RFC PATCH 22/22] riscv: s64ilp32: Temporary workaround solution to gcc problem guoren
2023-05-18 15:38 ` [RFC PATCH 00/22] riscv: s64ilp32: Running 32-bit Linux kernel on 64-bit supervisor mode Palmer Dabbelt
2023-05-18 18:29   ` Arnd Bergmann
2023-05-19  0:38     ` Paul Walmsley [this message]
2023-05-19  8:55       ` Arnd Bergmann
2023-05-19 15:31     ` Guo Ren
2023-05-19 16:53       ` Arnd Bergmann
2023-05-19 17:18         ` Palmer Dabbelt
2023-05-20  1:43         ` Guo Ren
2023-05-19  0:14   ` Paul Walmsley
2023-05-21 12:37     ` Guo Ren
2023-05-19 20:20 ` Arnd Bergmann
2023-05-20  2:53   ` Guo Ren
2023-05-20 10:13     ` Arnd Bergmann
2023-05-20 15:57       ` Guo Ren

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