linux-kernel - Re: [PATCH v6 1/3] arch: vDSO: Add a __vdso_getrandom prototype for all architectures

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Message-ID: <ZtSuywuMyYw316HL@zx2c4.com>
Date: Sun, 1 Sep 2024 20:13:31 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Xi Ruoyao <xry111@...111.site>, Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>, linux-crypto@...r.kernel.org,
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Jinyang He <hejinyang@...ngson.cn>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 1/3] arch: vDSO: Add a __vdso_getrandom prototype for
 all architectures

On Sun, Sep 01, 2024 at 08:06:51PM +0200, Christophe Leroy wrote:
> 
> 
> Le 01/09/2024 à 08:13, Xi Ruoyao a écrit :
> > Without a prototype, we'll have to add a prototype for each architecture
> > implementing vDSO getrandom.  As most architectures will likely have the
> > vDSO getrandom implemented in a near future, and we'd like to keep the
> > declarations compatible everywhere (to ease the Glibc work), we should
> > really just have one copy of the prototype.
> 
> It is a good idea but it have to handle all architectures, not only half 
> of them. If you look into vdso_config.h in selftests, you can see that 
> there are two names:
> 
> __kernel_getrandom is used on arm64, powerpc, s390,
> 
> __vdso_getrandom is used on arm, mips, sparc, x86, riscv, loongarch

I thought about this too, but actually it looks like the __vdso_* ones
are already being handled this way, while the __kernel_* ones have their
own special thing going on. See include/vdso/gettime.h. So this patch
makes __vdso_getrandom() just like the other ones in gettime.h, which is
fine with me.