linux-kernel - [PATCH V2 4/6] ARM: Make PID_IN_CONTEXTIDR incompatible with PID

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Message-Id: <1390581656-16372-5-git-send-email-adrienverge@gmail.com>
Date:	Fri, 24 Jan 2014 11:40:54 -0500
From:	Adrien Vergé <adrienverge@...il.com>
To:	Russell King <linux@....linux.org.uk>
Cc:	Adrien Vergé <adrienverge@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Christopher Covington <cov@...eaurora.org>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 4/6] ARM: Make PID_IN_CONTEXTIDR incompatible with PID_NS

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 <adrienverge@...il.com>
---
 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

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