From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v3 18/26] arm64: Introduce asm/vdso/processor.h Date: Sun, 15 Mar 2020 18:30:09 +0000 Message-ID: <20200315182950.GB32205@mbp> References: <20200313154345.56760-1-vincenzo.frascino@arm.com> <20200313154345.56760-19-vincenzo.frascino@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20200313154345.56760-19-vincenzo.frascino@arm.com> Sender: linux-mips-owner@vger.kernel.org To: Vincenzo Frascino Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, clang-built-linux@googlegroups.com, x86@kernel.org, Will Deacon , Arnd Bergmann , Russell King , Paul Burton , Thomas Gleixner , Andy Lutomirski , Ingo Molnar , Borislav Petkov , Stephen Boyd , Mark Salyzyn , Kees Cook , Peter Collingbourne , Dmitry Safonov <0x7f454c46@gmail.com>, Andrei Vagin , Nick Desaulniers , Marc Zyngier Mark List-Id: linux-arch.vger.kernel.org On Fri, Mar 13, 2020 at 03:43:37PM +0000, Vincenzo Frascino wrote: > --- /dev/null > +++ b/arch/arm64/include/asm/vdso/processor.h > @@ -0,0 +1,31 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright (C) 2020 ARM Ltd. > + */ > +#ifndef __ASM_VDSO_PROCESSOR_H > +#define __ASM_VDSO_PROCESSOR_H > + > +#ifndef __ASSEMBLY__ > + > +#include > + > +#ifdef CONFIG_COMPAT > +#if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS) > +/* > + * With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied > + * by the compat vectors page. > + */ > +#define TASK_SIZE_32 UL(0x100000000) > +#else > +#define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE) > +#endif /* CONFIG_ARM64_64K_PAGES */ > +#endif /* CONFIG_COMPAT */ Just curious, what's TASK_SIZE_32 used for in the vDSO code? You don't seem to move TASK_SIZE. -- Catalin From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com ([217.140.110.172]:34472 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727399AbgCOSaP (ORCPT ); Sun, 15 Mar 2020 14:30:15 -0400 Date: Sun, 15 Mar 2020 18:30:09 +0000 From: Catalin Marinas Subject: Re: [PATCH v3 18/26] arm64: Introduce asm/vdso/processor.h Message-ID: <20200315182950.GB32205@mbp> References: <20200313154345.56760-1-vincenzo.frascino@arm.com> <20200313154345.56760-19-vincenzo.frascino@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200313154345.56760-19-vincenzo.frascino@arm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Vincenzo Frascino Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, clang-built-linux@googlegroups.com, x86@kernel.org, Will Deacon , Arnd Bergmann , Russell King , Paul Burton , Thomas Gleixner , Andy Lutomirski , Ingo Molnar , Borislav Petkov , Stephen Boyd , Mark Salyzyn , Kees Cook , Peter Collingbourne , Dmitry Safonov <0x7f454c46@gmail.com>, Andrei Vagin , Nick Desaulniers , Marc Zyngier , Mark Rutland , Will Deacon Message-ID: <20200315183009.-weV0N9K0t2VhmUDejrOI52XSkV0Y9O6zwC9ReVa0kM@z> On Fri, Mar 13, 2020 at 03:43:37PM +0000, Vincenzo Frascino wrote: > --- /dev/null > +++ b/arch/arm64/include/asm/vdso/processor.h > @@ -0,0 +1,31 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright (C) 2020 ARM Ltd. > + */ > +#ifndef __ASM_VDSO_PROCESSOR_H > +#define __ASM_VDSO_PROCESSOR_H > + > +#ifndef __ASSEMBLY__ > + > +#include > + > +#ifdef CONFIG_COMPAT > +#if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS) > +/* > + * With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied > + * by the compat vectors page. > + */ > +#define TASK_SIZE_32 UL(0x100000000) > +#else > +#define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE) > +#endif /* CONFIG_ARM64_64K_PAGES */ > +#endif /* CONFIG_COMPAT */ Just curious, what's TASK_SIZE_32 used for in the vDSO code? You don't seem to move TASK_SIZE. -- Catalin