From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin Subject: [PATCH v3 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use Date: Fri, 18 Oct 2019 18:25:36 +0100 Message-ID: <1571419545-20401-4-git-send-email-Dave.Martin@arm.com> References: <1571419545-20401-1-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1571419545-20401-1-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: Paul Elliott , Peter Zijlstra , Catalin Marinas , Yu-cheng Yu , Amit Kachhap , Vincenzo Frascino , Will Deacon , linux-arch@vger.kernel.org, Marc Zyngier , Eugene Syromiatnikov , Szabolcs Nagy , "H.J. Lu" , Andrew Jones , Kees Cook , Arnd Bergmann , Jann Horn , Richard Henderson , =?UTF-8?q?Kristina=20Mart=C5=A1enko?= , Mark Brown , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Florian Weimer , Sudakshina Das List-Id: linux-arch.vger.kernel.org The asm-generic mman definitions are used by a few architectures that also define an arch-specific PROT flag with value 0x10. This currently applies to sparc and powerpc, and arm64 will soon join in. To help future maintainers, document the use of this flag in the asm-generic header too. Signed-off-by: Dave Martin --- include/uapi/asm-generic/mman-common.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index c160a53..81442d2 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -11,6 +11,7 @@ #define PROT_WRITE 0x2 /* page can be written */ #define PROT_EXEC 0x4 /* page can be executed */ #define PROT_SEM 0x8 /* page may be used for atomic ops */ + /* 0x10 reserved for arch-specific use */ #define PROT_NONE 0x0 /* page can not be accessed */ #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ -- 2.1.4 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from [217.140.110.172] ([217.140.110.172]:46996 "EHLO foss.arm.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S2502065AbfJRR1K (ORCPT ); Fri, 18 Oct 2019 13:27:10 -0400 From: Dave Martin Subject: [PATCH v3 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use Date: Fri, 18 Oct 2019 18:25:36 +0100 Message-ID: <1571419545-20401-4-git-send-email-Dave.Martin@arm.com> In-Reply-To: <1571419545-20401-1-git-send-email-Dave.Martin@arm.com> References: <1571419545-20401-1-git-send-email-Dave.Martin@arm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: Andrew Jones , Arnd Bergmann , Catalin Marinas , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Kees Cook , =?UTF-8?q?Kristina=20Mart=C5=A1enko?= , Marc Zyngier , Mark Brown , Paul Elliott , Peter Zijlstra , Richard Henderson , Sudakshina Das , Szabolcs Nagy , Thomas Gleixner , Will Deacon , Yu-cheng Yu , Amit Kachhap , Vincenzo Frascino , linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org Message-ID: <20191018172536.x_ZVR5RKhgCEznX8N3yVZfzFntdWtxvTj0FrCGxgVxI@z> The asm-generic mman definitions are used by a few architectures that also define an arch-specific PROT flag with value 0x10. This currently applies to sparc and powerpc, and arm64 will soon join in. To help future maintainers, document the use of this flag in the asm-generic header too. Signed-off-by: Dave Martin --- include/uapi/asm-generic/mman-common.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index c160a53..81442d2 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -11,6 +11,7 @@ #define PROT_WRITE 0x2 /* page can be written */ #define PROT_EXEC 0x4 /* page can be executed */ #define PROT_SEM 0x8 /* page may be used for atomic ops */ + /* 0x10 reserved for arch-specific use */ #define PROT_NONE 0x0 /* page can not be accessed */ #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ -- 2.1.4