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scheduling in DSP/BIOS

hi.. 

          when ever task run in infinite loop preemptive scheduling is not working properly. the task that need to be in running state is always blocked and the controll moves to KNL_swi. even i could not able to trigger the  task priodically. help me to solv this problem. is there any configuration settings to be done in DSP/BIOs configuration file.

FOr example if higher priority task calls task_sleep it get blocked infinitely neither the next low priority task is running nor high priority task becomes ready aftersleep time.