Re: [RFC 1/2] rwsem: introduce upgrade_read interface

[Matthew Wilcox]

On Tue, Oct 15, 2024 at 09:56:51PM -0700, Christoph Hellwig wrote:
> On Wed, Oct 16, 2024 at 12:35:59PM +0800, lizhe.67@xxxxxxxxxxxxx wrote:
> > From: Li Zhe <lizhe.67@xxxxxxxxxxxxx>
> > 
> > Introduce a new rwsem interface upgrade_read(). We can call it
> 
> It's obviously a try_upgrade_read, right?

Well, that's confusing.  "try" usually means "don't sleep", and this
sleeps.  Maybe it shouldn't sleep; ie we make this fail if there's any
other reader?  It'll succeed less often, but it'll be easier to
understand.