anchao opened a new pull request #3871:
URL: https://github.com/apache/incubator-nuttx/pull/3871
## Summary
arch: adjust idle stack offset to reserve space of stack info
## Impact
idle thread stack usage
## Testing
```
PID GROUP CPU PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK
USED FILLED CPU COMMAND
0 0 0 0 FIFO Kthread N-- Assigned 00000000 004096
004080 99.6%! 50.0% CPU0 IDLE
```
After patch:
```
PID GROUP CPU PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK
USED FILLED CPU COMMAND
0 0 0 0 FIFO Kthread N-- Assigned 00000000 004076
000920 22.5% 50.0% CPU0 IDLE
```
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