Question about commit 94f01e467566("together/applyrcu: Note possibility of lost counts")

[Alan Huang <mmpgouride@xxxxxxxxx>]

Hi Paul,

I noticed this commit 94f01e467566("together/applyrcu: Note possibility of lost counts”) said that:

	count_unregister_thread()  can result in the outgoing thread's counts being lost. 
        This can happen when read_count() is invoked between lines 66 and 68.

However, line 66 NULLs the local data, and it has not been published, I don’t think 
count_unregister_thread()  can result in the outgoing thread's counts being lost.

Or, am I missing something?

Thanks,
Alan