Paul Mackerras <pau...@ozlabs.org> writes: > On Wed, Apr 08, 2020 at 10:21:29PM +1000, Michael Ellerman wrote: >> >> We should be able to just allocate the rtas_args on the stack, it's only >> ~80 odd bytes. And then we can use rtas_call_unlocked() which doesn't >> take the global lock. > > Do we instantiate a 64-bit RTAS these days, or is it still 32-bit?
No, yes. > In the old days we had to make sure the RTAS argument buffer was > below the 4GB point. Yes you're right, that's still true. I was thinking we were on the emergency stack, but we may not be. > If that's still necessary then perhaps putting rtas_args inside the > PACA would be the way to go. Yeah I guess. Allocating a struct within the RMO for each CPU is not that simple vs just putting it in the paca. cheers