linux-kernel - Re: [PATCH 01/13] seqnum_ops: Introduce Sequence Number Ops

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Date:   Wed, 11 Nov 2020 17:04:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     corbet@....net, keescook@...omium.org, gregkh@...uxfoundation.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/13] seqnum_ops: Introduce Sequence Number Ops

On Wed, Nov 11, 2020 at 08:56:49AM -0700, Shuah Khan wrote:

> Why would you say no to read and inc?

Because they don't guarantee uniqueness (bar wrapping), which is the
only reason to use an atomic to begin with.