On Wed, Jan 18, 2023 at 02:26:39PM +0800, Hillf Danton wrote: > On Tue, Jan 17, 2023 at 10:27 AM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > > > The cpu_relax() is exactly the wrong thing to do here. See this thread: > > https://lore.kernel.org/linux-fsdevel/20230113184447.1707316-1-mjguzik@xxxxxxxxx/ > > If you are right, feel free to go and remove every cpu_relax() under the > kernel/locking directory. I see you didn't read the whole thread where Linus points out that a cmpxchg() loop is fundamentally different from a spinlock.
