Messages in this thread | | | Date | Fri, 24 Jan 2014 12:16:28 -0500 | Subject | Re: [PATCH V2 4/6] ARM: Make PID_IN_CONTEXTIDR incompatible with PID_NS | From | Adrien Vergé <> |
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2014/1/24 Will Deacon <will.deacon@arm.com>: > Are you sure about this? The value we write is actually task_pid_nr, which I > believe to be globally unique.
You are right: the task_pid_nr is unique in the system. However when using namespaces, the so called "PID" is the virtual number that processes in different namespaces can share.
This PID is the one visible by user-space tasks, in particular user-space tracers and debuggers. These programs would expect to find the PID of the traced process in the Context ID reg, while it is not. I think it is better to remove confusion by making PID_IN_CONTEXTIDR and PID_NS incompatible.
What do you think?
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