linux-kernel - Re: [PATCH V2 12/14] LoongArch: Adjust VDSO/VSYSCALL for 32BIT/64BIT

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Message-Id: <4155a60c-81da-4c23-8a66-9a748b3383e4@app.fastmail.com>
Date: Tue, 18 Nov 2025 14:41:40 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Huacai Chen" <chenhuacai@...ngson.cn>,
 "Huacai Chen" <chenhuacai@...nel.org>
Cc: 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
Subject: Re: [PATCH V2 12/14] LoongArch: Adjust VDSO/VSYSCALL for 32BIT/64BIT

On Tue, Nov 18, 2025, at 12:27, Huacai Chen wrote:
> Adjust VDSO/VSYSCALL because read_cpu_id() for 32BIT/64BIT are
> different, and LoongArch32 doesn't support GENERIC_GETTIMEOFDAY now.
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>

Are you planning to add vdso_clock_gettime() later, or is the
architecture missing hardware access to the timer register
on loongarch32?

It would be good to add some comments here to ensure this is
done correctly if someone adds the vdso32 support later:
There should be clock_gettime32 support, but not the old
clock_gettime(), clock_getres() or time().

       Arnd