linux-kernel - Re: [PATCH] LoongArch: Define __ARCH_WANT_NEW

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Date: Sun, 12 May 2024 11:11:10 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Huacai Chen <chenhuacai@...ngson.cn>, loongarch@...ts.linux.dev, 
	Linux-Arch <linux-arch@...r.kernel.org>, Xuefeng Li <lixuefeng@...ngson.cn>, 
	guoren <guoren@...nel.org>, WANG Xuerui <kernel@...0n.name>, 
	Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org, 
	loongson-kernel@...ts.loongnix.cn, stable@...r.kernel.org
Subject: Re: [PATCH] LoongArch: Define __ARCH_WANT_NEW_STAT in unistd.h

On Sat, May 11, 2024 at 11:39 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Sat, May 11, 2024, at 16:28, Huacai Chen wrote:
> > On Sat, May 11, 2024 at 8:17 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> >> Importantly, we can't just add fstatat64() on riscv32 because
> >> there is no time64 version for it other than statx(), and I don't
> >> want the architectures to diverge more than necessary.
> >> I would not mind adding a variant of statx() that works for
> >> both riscv32 and loongarch64 though, if it gets added to all
> >> architectures.
> >
> > As far as I know, Ren Guo is trying to implement riscv64 kernel +
> > riscv32 userspace, so I think riscv32 kernel won't be widely used?
>
> I was talking about the ABI, so it doesn't actually matter
> what the kernel is: any userspace ABI without
> CONFIG_COMPAT_32BIT_TIME is equally affected here. On riscv32
> this is the only allowed configuration, while on others (arm32
> or x86-32 userland) you can turn off COMPAT_32BIT_TIME on
> both 32-bit kernel and on 64-bit kernels with compat mode.
I don't know too much detail, but I think riscv32 can do something
similar to arm32 and x86-32, or we can wait for Xuerui to improve
seccomp. But there is no much time for loongarch because the Debian
loong64 port is coming soon.

Huacai

>
>      Arnd
>