x86_perf_task_context_arch_lbr_xsave
struct x86_perf_task_context_arch_lbr_xsave *xsave = cpuc->lbr_xsave;
size = sizeof(struct x86_perf_task_context_arch_lbr_xsave) +
struct x86_perf_task_context_arch_lbr_xsave *task_ctx = ctx;
struct x86_perf_task_context_arch_lbr_xsave *task_ctx = ctx;