x86_perf_task_context_arch_lbr
size = sizeof(struct x86_perf_task_context_arch_lbr) +
struct x86_perf_task_context_arch_lbr *task_ctx = ctx;
struct x86_perf_task_context_arch_lbr *task_ctx = ctx;
return &((struct x86_perf_task_context_arch_lbr *)ctx)->opt;