Joerg Roedel <joro@xxxxxxxxxx> writes: > From: Joerg Roedel <jroedel@xxxxxxx> > > We want x86_tss.sp0 point to the entry stack later to use > it as a trampoline stack for other kernel entry points > besides SYSENTER. > > So store the task stack pointer in x86_tss.sp1, which is > otherwise unused by the hardware, as Linux doesn't make use > of Ring 1. Seems like a hack. Why can't that be stored in a per cpu variable? -Andi
