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

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Message-ID: <CAAhV-H5__bTzjTbrHq++k3H+xuAfM5c-bLYa6A_GjHev8CbS4g@mail.gmail.com>
Date: Tue, 18 Nov 2025 22:34:01 +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
Subject: Re: [PATCH V2 12/14] LoongArch: Adjust VDSO/VSYSCALL for 32BIT/64BIT

Hi, Arnd,

On Tue, Nov 18, 2025 at 9:42 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> 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?
Hardware has no problem, vdso_clock_gettime() will be added later.

Huacai

>
> 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
>