Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751843AbaAXQlc (ORCPT ); Fri, 24 Jan 2014 11:41:32 -0500 Received: from mail-ie0-f173.google.com ([209.85.223.173]:34310 "EHLO mail-ie0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751720AbaAXQl2 (ORCPT ); Fri, 24 Jan 2014 11:41:28 -0500 From: =?UTF-8?q?Adrien=20Verg=C3=A9?= To: Russell King Cc: =?UTF-8?q?Adrien=20Verg=C3=A9?= , Catalin Marinas , Will Deacon , Ben Dooks , "zhangwei(Jovi)" , Andrew Morton , Randy Dunlap , Mathieu Poirier , Christopher Covington , Dirk Behme , Michel Dagenais , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH V2 4/6] ARM: Make PID_IN_CONTEXTIDR incompatible with PID_NS Date: Fri, 24 Jan 2014 11:40:54 -0500 Message-Id: <1390581656-16372-5-git-send-email-adrienverge@gmail.com> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1390581656-16372-1-git-send-email-adrienverge@gmail.com> References: <1390581656-16372-1-git-send-email-adrienverge@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When using namespaces, different processes can have the same PID. It makes no sense to store a PID value in the Context ID register to track a specific process, when others share the same value. Consequently, PID_IN_CONTEXTIDR (which is used for tracing and debugging processes) should not be compatible with PID_NS. Signed-off-by: Adrien Vergé --- arch/arm/Kconfig.debug | 2 +- arch/arm64/Kconfig.debug | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 5765abf..ed46748 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -1143,7 +1143,7 @@ config ARM_KPROBES_TEST config PID_IN_CONTEXTIDR bool "Write the current PID to the CONTEXTIDR register" - depends on CPU_COPY_V6 + depends on CPU_COPY_V6 && !PID_NS help Enabling this option causes the kernel to write the current PID to the PROCID field of the CONTEXTIDR register, at the expense of some diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 835c559..06b2633b 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -17,6 +17,7 @@ config EARLY_PRINTK config PID_IN_CONTEXTIDR bool "Write the current PID to the CONTEXTIDR register" + depends on !PID_NS help Enabling this option causes the kernel to write the current PID to the CONTEXTIDR register, at the expense of some additional -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/