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If PID namespace is enabled, everytime users configure the Context ID register to trace the specific process, there needs to be a translation between the real PID seen from the kernel and VPID seen from the namespace in which the user's process resides . This patch just adds the translation interface for ETMs. Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>