Linus Torvalds writes: (Summary) Compared to
all the PTI mess, it's not even noticeable.
all the PTI mess, it's not even noticeable.
And if we ever get CPU's that have this all fixed, we can re-visit introducing the fastpath. But this is all very messy and it doesn't seem worth it right now.
seem worth it right now.
If we get rid of the fastpath, we can lay out the slow path slightly better, and get rid of some of those jump-overs. And we'd get rid of the ptregs hooks entirely.
the ptregs hooks entirely.
So we can try to make the "slow" path better while at it, but I really don't think it matters much now in the post-PTI era.
all the PTI mess, it's not even noticeable.
And if we ever get CPU's that have this all fixed, we can re-visit introducing the fastpath. But this is all very messy and it doesn't seem worth it right now.
seem worth it right now.
If we get rid of the fastpath, we can lay out the slow path slightly better, and get rid of some of those jump-overs. And we'd get rid of the ptregs hooks entirely.
the ptregs hooks entirely.
So we can try to make the "slow" path better while at it, but I really don't think it matters much now in the post-PTI era.