linux-kernel - Re: [RFC 1/2] rwsem: introduce upgrade

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Message-ID: <Zw9s86K0Dv2FZvt2@infradead.org>
Date: Wed, 16 Oct 2024 00:36:19 -0700
From: Christoph Hellwig <hch@...radead.org>
To: lizhe.67@...edance.com
Cc: hch@...radead.org, akpm@...ux-foundation.org, boqun.feng@...il.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	longman@...hat.com, mingo@...hat.com, peterz@...radead.org,
	will@...nel.org
Subject: Re: [RFC 1/2] rwsem: introduce upgrade_read interface

On Wed, Oct 16, 2024 at 03:33:40PM +0800, lizhe.67@...edance.com 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 ".