On Wed, Mar 25, 2015 at 10:55 PM, <Valdis.Kletnieks@xxxxxx> wrote: > 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. can you come out of this lazy mode explain this a bit more because I am a newbie ?or tell me what else I should know before I have to understand this code -- Regards, Sreejith _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
