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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/02/04 06:32:43 UTC

[GitHub] [incubator-nuttx] masayuki2009 commented on issue #207: SMP for Cortex-A MPcore is unstable

masayuki2009 commented on issue #207: SMP for Cortex-A MPcore is unstable
URL: https://github.com/apache/incubator-nuttx/issues/207#issuecomment-581763631
 
 
   I thought the memory corruption issue relates to an IPI (Inter Processor Interrupt) issue.
   But I noticed that there was no nested interrupts. 
   
   Also, I noticed that there is a global temporary storage called irqtmp in arm_vectorirq.S.
   I'm not sure why this storage is needed for Cortex-A implementation (perhaps, to store 
   registers to change processor mode?) but the irqtmp would be accessed from multiple
   CPUs so I think the storage should be protected or should be allocated per CPU.
   
   

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