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fix: kernel/trace/ring_buffer.c: In function ‘rb_allocate_pages’: kernel/trace/ring_buffer.c:235: error: ‘cpu’ undeclared (first use in this function) kernel/trace/ring_buffer.c:235: error: (Each undeclared identifier is reported only once kernel/trace/ring_buffer.c:235: error: for each function it appears in.) Signed-off-by: Ingo Molnar <mingo@elte.hu>