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

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Date:   Wed, 11 Nov 2020 09:23:20 +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 Tue, Nov 10, 2020 at 12:53:27PM -0700, Shuah Khan wrote:

> + * The interface provides:
> + * seqnum32 & seqnum64 functions:
> + *	initialization
> + *	set
> + *	read
> + *	increment and no return
> + *	decrement and no return

NAK, this is batshit insane again. If you want a sequence number, the
one and _ONLY_ primitive you want to expose is inc_return.

No set, no read, no inc, and most certainly, not dec.