linux-kernel - Re: [PATCH] refcount: introduce refcount_is

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Message-ID: <aecc489431c38f170097ae1eb37a7d22@linux.dev>
Date:   Thu, 18 Nov 2021 10:34:44 +0000
From:   yajun.deng@...ux.dev
To:     "Peter Zijlstra" <peterz@...radead.org>
Cc:     will@...nel.org, boqun.feng@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] refcount: introduce refcount_is_one() helper function

November 18, 2021 4:44 PM, "Peter Zijlstra" <peterz@...radead.org> wrote:

> On Thu, Nov 18, 2021 at 08:12:56AM +0000, yajun.deng@...ux.dev wrote:
> 
>> November 18, 2021 3:42 PM, "Peter Zijlstra" <peterz@...radead.org> wrote:
>> 
>> On Thu, Nov 18, 2021 at 11:53:28AM +0800, Yajun Deng wrote:
>> 
>> There are many cases where it is necessary to determine if refcount is one,
>> introduce refcount_is_one() helper function for these cases.
>> 
>> Give me one that is not racy?
>> 
>> The following determine refcount is one, 35 count.
> 
> Very good, now get me one that isn't broken :-)

Sorry, I didn't understand what is the 'isn't broken'。