>On Tue, Aug 17, 2021 at 11:42 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > > On Tue, 17 Aug 2021 at 05:17, Hao Peng <flyingpenghao@xxxxxxxxx> wrote: > > > > kmap_local_page() is enough. > > This explanation is not enough for me to understand the patch. Please > describe in more detail. > Due to the introduction of kmap_local_*, the storage of slots used for short-term mapping has changed from per-CPU to per-thread. kmap_atomic() disable preemption, while kmap_local_*() only disable migration. There is no need to disable preemption in several kamp_atomic places used in fuse. The detailed introduction of kmap_local_*d can be found here: https://lwn.net/Articles/836144/ Thanks. > Thanks, > Miklos
