masayuki2009 commented on pull request #5775:
URL: https://github.com/apache/incubator-nuttx/pull/5775#issuecomment-1072069818


   @no1wudi 
   
   >Could you have a try for it ?
   
   ostest with maix-bit:smp on QEMU now works.
   
   >BTW, in exception_common we save/restore mstatus by csrr/csrw, but in 
up_irq_enable/up_irq_disable use the bit operation csrc/csrs, should we use bit 
operation for these bits while restore mstatus ?
   
   In my understanding, we can not use csrc/csrs in exception_common to 
save/restore the mstatus.
   


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