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

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Message-Id: <fcdeb993-37d6-42e0-8737-3be41413f03d@app.fastmail.com>
Date: Sat, 11 May 2024 17:38:35 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Huacai Chen" <chenhuacai@...nel.org>
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 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.

     Arnd