linux-kernel - Re: [PATCH 3/9] x86: vdso: Introduce asm/vdso/page.h

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Message-ID: <919d9520-32a5-4a32-880d-8ac53601b188@csgroup.eu>
Date: Wed, 4 Sep 2024 19:14:58 +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 3/9] x86: vdso: Introduce asm/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 asm/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>
> ---
>   arch/x86/include/asm/vdso/page.h | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>   create mode 100644 arch/x86/include/asm/vdso/page.h
> 
> diff --git a/arch/x86/include/asm/vdso/page.h b/arch/x86/include/asm/vdso/page.h
> new file mode 100644
> index 000000000000..b0af8fbef27c
> --- /dev/null
> +++ b/arch/x86/include/asm/vdso/page.h
> @@ -0,0 +1,15 @@
> +
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_VDSO_PAGE_H
> +#define __ASM_VDSO_PAGE_H
> +
> +#ifndef __ASSEMBLY__
> +
> +#include <asm/page_types.h>
> +
> +#define VDSO_PAGE_MASK	PAGE_MASK
> +#define VDSO_PAGE_SIZE	PAGE_SIZE

Same, I don't think we need those macros to duplicate PAGE_SIZE and 
PAGE_MASK in each and every architecture.

The best would be to use CONFIG_PAGE_SHIFT which is defined the same way 
on every architecture and refactor PAGE_SIZE and PAGE_MASK and get rid 
of all arch specific definitions of PAGE_SIZE and PAGE_MASK.

> +
> +#endif /* !__ASSEMBLY__ */
> +
> +#endif /* __ASM_VDSO_PAGE_H */