xiaoxiang781216 opened a new pull request, #9163:
URL: https://github.com/apache/nuttx/pull/9163

   ## Summary
   
   Remove KEEP_ALIVE_HACK to avoid waking up the device periodly. The 
workaround it's added by:
   ```
       commit 6546fa39c7a292e919d1ea396d67bea8242f2c4b
       Author: Gregory Nutt <[email protected]>
       Date:   Tue Aug 12 11:12:00 2014 -0600
   
       Tickless Stuff:  Back out the risky timer operations when the 
ready-to-run
       list is modified. That is unsafe.  An ugly workaround is just to keep an
       interval timer going all of the time with a minimum duration equal to the
       timeslice interval.
   ```
   But look like it doesn't needed anymore.
   
   ## Impact
   
   tickless with round robin
   
   ## Testing
   
   internal test


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