On 9/2/21 1:02 PM, Matthew Wilcox wrote: > On Thu, Sep 02, 2021 at 12:59:33PM -0600, Jens Axboe wrote: >> On 9/2/21 12:56 PM, Matthew Wilcox wrote: >>> On Thu, Sep 02, 2021 at 10:22:23AM -0600, Jens Axboe wrote: >>>> Hi, >>>> >>>> Booting current -git yields the below splat. I'm assuming this is >>>> related to the new RT stuff, where spin_lock() can sleep. This obviously >>>> won't fly off IPI. >>> >>> You want to turn off PROVE_RAW_LOCK_NESTING for the moment. >> >> Because? > > help > Enable the raw_spinlock vs. spinlock nesting checks which ensure > that the lock nesting rules for PREEMPT_RT enabled kernels are > not violated. > > NOTE: There are known nesting problems. So if you enable this > option expect lockdep splats until these problems have been fully > addressed which is work in progress. This config switch allows to > identify and analyze these problems. It will be removed and the > check permanently enabled once the main issues have been fixed. > > If unsure, select N. This isn't a new text, it's been like that for quite a while. The warning is new on -git with that option. -- Jens Axboe
