On Wed, Mar 04, 2026 at 04:15:48PM +0100, Peter Zijlstra wrote: > On Wed, Mar 04, 2026 at 03:51:34PM +0100, Christoph Hellwig wrote: > > > > How about "WARN_ON_ONCE(!preemptible())"? I think that covers the union > > > of the context restrictions correctly. (Compared to in_task(), it > > > handles the cases where hardirqs or softirqs are disabled.) > > > > Good enough I guess. Peter? > > Sure. The only caveat with that is that for PREEMPT_COUNT=n this might > not work, it unconditionally returns 0.
That's a pretty good argument for the lockdep version...
