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The dyntick-idle steal time is currently accounted when the tick restarts but the stolen idle time is not subtracted from the idle time that was already accounted. This is to avoid observing the idle time going backward as the dyntick-idle cputime accessors can't reliably know in advance the stolen idle time. In order to maintain a forward progressing idle cputime while subtracting idle steal time from it, keep track of the previously accounted idle stolen time and substract it from _later_ idle cputime accounting. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com> Link: https://patch.msgid.link/20260508131647.43868-16-frederic@kernel.org