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

[Christoph Hellwig]

On Wed, Oct 16, 2024 at 03:33:40PM +0800, lizhe.67@xxxxxxxxxxxxx wrote:
> >> +extern int upgrade_read(struct rw_semaphore *sem);
> >
> >No need for the extern.  Also please make any new advanced funtionality
> 
> Sorry I don't understand why extern is not needed. If we remove it,
> we will encounter the following compilation error:

That sounds like you dropped the entire line above, and not just the
"extern ".