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

[Shuah Khan]

On 11/11/20 10:50 AM, Peter Zijlstra wrote:
> On Wed, Nov 11, 2020 at 10:34:05AM -0700, Shuah Khan wrote:
>
> > Not sure what to make of the 6080 atomic_read()s and 3413
> > atomic_inc()s, some of which might be assuming uniqueness
> > guarantee.
>
> Well, clearly you just did: git grep atimic_{read,inc}() | wc -l and
> didn't look at the usage. Equally clearly there can be bugs. Also
> evidently much of those are not in fact sequence numbers.

Looking at the usage and classifying which usages are sequence
numbers is part of may audit and we are covered. Your explanation
and this discussion helps with do a better audit of these usages.

> All I'm saying is that if you want a sequence number, inc_return (or
> fetch_inc) is the only sane option.

Cool.

thanks,
-- Shuah