[$] Removing GFP_NOFS

The GFP_NOFS flag is meant for kernel memory allocations thatshould not cause a call into the filesystems to reclaim memory because there arealready locks held that can potentially cause a deadlock. The "scopedallocation" API is a better choice for filesystems to indicate that theyare holding a lock, so GFP_NOFS has long been on the chopping block, thoughprogress has been slow. In a filesystem-track session atthe 2024 Linux Storage,Filesystem, Memory Management, and BPF Summit, Matthew Wilcox wanted todiscuss how to move kernel filesystems away from the flag with the eventualgoal of removing it completely.