Re: [PATCH 1/5] locking: Add rwsem_is_write_locked()

[Peter Zijlstra]

On Tue, Sep 12, 2023 at 08:29:55AM +1000, Dave Chinner wrote:

> So, once again, we have mixed messages from the lock maintainers.
> One says "no, it might get abused", another says "I'm fine with
> that", and now we have a maintainer disagreement stalemate.

I didn't say no, I was trying to see if there's alternatives because the
is_locked pattern has a history of abuse.

If not, then sure we can do this; it's not like I managed to get rid of
muteX_is_locked() -- and I actually tried at some point :/

And just now I grepped for it, and look what I find:

drivers/hid/hid-nintendo.c:     if (unlikely(mutex_is_locked(&ctlr->output_mutex))) {
drivers/nvdimm/btt.c:           if (mutex_is_locked(&arena->err_lock)

And there's more :-(

Also, please just calm down already..