linux-kernel - Re: [PATCH v3 2/2] vdso: Introduce vdso/page.h

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Message-ID: <87wmihr49g.ffs@tglx>
Date: Wed, 09 Oct 2024 11:53:47 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Vincenzo Frascino <vincenzo.frascino@....com>,
 linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-mm@...ck.org
Cc: Vincenzo Frascino <vincenzo.frascino@....com>, Andy Lutomirski
 <luto@...nel.org>, "Jason A . Donenfeld" <Jason@...c4.com>, Christophe
 Leroy <christophe.leroy@...roup.eu>, 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 v3 2/2] vdso: Introduce vdso/page.h

On Thu, Oct 03 2024 at 16:29, Vincenzo Frascino wrote:
> 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.
>
> Note: on a 32-bit architecture UL is an unsigned 32 bit long. Hence when
> it supports 64-bit phys_addr_t we might end up in situation in which
> the

We end up with nothing.

> top 32 bit are cleared. To prevent this issue this patch provides
> separate macros for PAGE_MASK.

'this patch' is redundant information.

git grep 'This patch' Documentation/process/

> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __VDSO_PAGE_H
> +#define __VDSO_PAGE_H
> +
> +#include <uapi/linux/const.h>
> +
> +/*
> + * PAGE_SHIFT determines the page size.
> + *
> + * Note: This definition is required because PAGE_SHIFT is used
> + * in several places throuout the codebase.
> + */
> +#define PAGE_SHIFT      CONFIG_PAGE_SHIFT
> +
> +#define PAGE_SIZE	(_AC(1,UL) << CONFIG_PAGE_SHIFT)
> +
> +#if defined(CONFIG_PHYS_ADDR_T_64BIT)
> +#define PAGE_MASK	(~((1 << CONFIG_PAGE_SHIFT) - 1))
> +#else
> +#define PAGE_MASK	(~(PAGE_SIZE-1))

#define PAGE_MASK	(~(PAGE_SIZE - 1))

please.

Thanks,

        tglx