linux-kernel - Re: [PATCH v2 03/17] vdso: Add __arch_get_k_vdso_rng

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Message-ID: <ZswtoMbWC3se1su3@zx2c4.com>
Date: Mon, 26 Aug 2024 09:24:16 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>, Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Shuah Khan <shuah@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 03/17] vdso: Add __arch_get_k_vdso_rng_data()

On Thu, Aug 22, 2024 at 09:13:11AM +0200, Christophe Leroy wrote:
> _vdso_data is specific to x86 and __arch_get_k_vdso_data() is provided
> so that all architectures can provide the requested pointer.
> 
> Do the same with _vdso_rng_data, provide __arch_get_k_vdso_rng_data()
> and don't use x86 _vdso_rng_data directly.
> 
> Until now vdso/vsyscall.h was only included by time/vsyscall.c but now
> it will also be included in char/random.c, leading to a duplicate
> declaration of _vdso_data and _vdso_rng_data.
> 
> To fix this issue, move declaration in a C file. vma.c looks like the
> most appropriate candidate. Don't need to replace the definitions in
> vsyscall.h by declarations as declarations are already in asm/vvar.h
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
> v2: Move x86 DEFINE_VVAR(_vdso_data) and DEFINE_VVAR(_vdso_rng_data) in vma.c

Thanks, this seems sane to me. I'll apply this now to random.git as a
fix; it should have been done this way before and is going to be a
headache to coordinate later.

Jason