On Sat, Aug 15, 2020 at 01:14:53AM +0200, Thomas Gleixner wrote: > #1 trivial fix is to force switching to an high prio thread or a soft > interrupt which does the allocation
Yeah, push the alocation out to another context. I did consider it, but why bother? Also, raising a softirq can't be done from every context, that's a whole new problem. You can do irq_work I suppose, but not all architectures support the self-IPI yet. All in all, it's just more complexity than the fairly trivial __alloc_page_lockless(). Whichever way around, we can't rely on the allocation.
