On 2023-06-21 13:49:06 [+0200], Michal Hocko wrote: > > On PREEMPT_RT what you can happen is that the writer is preempted by a > > high-priority reader which then deadlocks because the reader spins while > > waiting and the writer is blocked. For this issue we have lock + unlock > > in the seq reader to PI boost the seq writer so it can make progress. > > Please state the the problem explicitly in the changelog. You are > marking this patch as a fix so the underlying issue should be stated. The problem is the "local_irq_save()" which I believe I stated. The lock + unlock story was just a side story and is already covered. I really need just the local_irq_save() invocation to be part of the seqlock API so it can be substituted away. > Thanks! Sebastian
