From mboxrd@z Thu Jan 1 00:00:00 1970 From: adrienverge@gmail.com (=?UTF-8?q?Adrien=20Verg=C3=A9?=) Date: Fri, 24 Jan 2014 11:40:54 -0500 Subject: [PATCH V2 4/6] ARM: Make PID_IN_CONTEXTIDR incompatible with PID_NS In-Reply-To: <1390581656-16372-1-git-send-email-adrienverge@gmail.com> References: <1390581656-16372-1-git-send-email-adrienverge@gmail.com> Message-ID: <1390581656-16372-5-git-send-email-adrienverge@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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 Verg? --- 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