On Fri, Jul 17, 2026 at 10:32:52AM -0700, Usama Arif wrote:

This affects long-running systems and workloads with high context-switch
rates. A CPU switching 1,000 times per second takes about 50 days.

nr_context_switches_cpu() returns "unsigned long long"
and rq->nr_switches is u64, so the unsigned int cnt truncation is real

Fixes: 64cf7d058a00 ("tracing: Have trace_marker use per-cpu data to read user space")
Cc: stable@vger.kernel.org
Reported-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Usama Arif <usama.arif@linux.dev>

Reviewed-by: Breno Leitao <leitao@debian.org>

Thanks for the investigation and fix,
--breno