On Wed, 25 Mar 2015 21:35:22 +0530, Sreejith M M said: > > This code is handling context switch from a kernel thread back to user mode > > thread so TLB entries are invalid translation for user mode thread and do > > not correspond to user process pgd. It is Master kernel page table > > translation as a result of kernel thread execution. > > > > -Rajat > Hi Rajat, > > If that is the case, why this code is put under CONFIG_SMP switch?
Vastly simplified because I'm lazy :) If you look at the code, it's poking the status on *other* CPUs. That's why the cpumask() stuff. If you're on a single execution unit, you don't have to tell the other CPU about the change in state, because there isn't an other CPU.
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