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Srivatsa Vaddagiri noticed occasionally incorrect CPU usage values in top and tracked it down to stime going below 0 in task_stime(). Negative values are possible there due to the sampled nature of stime/utime. Fix suggested by Balbir Singh. Signed-off-by: Ingo Molnar <mingo@elte.hu> Tested-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com>