linux-kernel - Re: [PATCH 4/9] vdso: Introduce vdso/page.h

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Message-ID: <18bcf426-b0a8-486b-b9f7-8418d401bb70@csgroup.eu>
Date: Wed, 4 Sep 2024 19:16:00 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Vincenzo Frascino <vincenzo.frascino@....com>,
 linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, linux-mm@...ck.org
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 "Jason A . Donenfeld" <Jason@...c4.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Naveen N Rao <naveen@...nel.org>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "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>
Subject: Re: [PATCH 4/9] vdso: Introduce vdso/page.h

Le 03/09/2024 à 17:14, Vincenzo Frascino a écrit :
> The VDSO implementation includes headers from outside of the
> vdso/ namespace.
> 
> Introduce vdso/page.h to make sure that the generic library
> uses only the allowed namespace.
> 
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Jason A. Donenfeld <Jason@...c4.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> ---
>   include/vdso/page.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>   create mode 100644 include/vdso/page.h
> 
> diff --git a/include/vdso/page.h b/include/vdso/page.h
> new file mode 100644
> index 000000000000..f18e304941cb
> --- /dev/null
> +++ b/include/vdso/page.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __VDSO_PAGE_H
> +#define __VDSO_PAGE_H
> +
> +#include <asm/vdso/page.h>

I can't see the benefit of that, the generic library can directly 
include asm/vdso/page.h

> +
> +#endif	/* __VDSO_PAGE_H */