Questions on Call single data (CSD)

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Hi,

I have couple of questions on Call single data (CSD) .

I am going through kernel/smp.c

  • From what i understand CSD struct is used to run a particular function on a another core (Not sure if i am right ) ? (csd -> func) ( in function smp_call_function_many)
  • What do these csd_lock_wait and csd_lock do. As per the code this its used to serialize access and it says there is a per CPU CSD resources. I am not getting what is meant here.If its per CPU , then why serialize access ?

  • The list inside csd . Is this by any chance circular ?

Thanks and regards,
Vignesh
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