Re: [RFC PATCH] locking/percpu-rwsem: use this_cpu_{inc|dec}() for read_count

[peterz]

On Fri, Sep 18, 2020 at 12:01:12PM +0200, peterz@xxxxxxxxxxxxx wrote:
> +	u64 sum = per_cpu_sum(*(u64 *)sem->read_count);

Moo, that doesn't work, we have to do two separate sums. I shouldn't try
to be clever on a Friday I suppose :-(