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tracing: change CPU ring buffer state from tracing_cpumask
commit 71babb2 upstream. According to Documentation/trace/ftrace.txt: tracing_cpumask: This is a mask that lets the user only trace on specified CPUS. The format is a hex string representing the CPUS. The tracing_cpumask currently doesn't affect the tracing state of per-CPU ring buffers. This patch enables/disables CPU recording as its corresponding bit in tracing_cpumask is set/unset. Link: http://email@example.com Cc: Frederic Weisbecker <firstname.lastname@example.org> Cc: Ingo Molnar <email@example.com> Cc: Laurent Chavey <firstname.lastname@example.org> Cc: Justin Teravest <email@example.com> Cc: David Sharp <firstname.lastname@example.org> Signed-off-by: Vaibhav Nagarnaik <email@example.com> Signed-off-by: Steven Rostedt <firstname.lastname@example.org> Signed-off-by: Ben Hutchings <email@example.com>
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