linux-kernel - Re: [PATCH v2] net: openvswitch: pass NULL for unused parameters

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Date:   Tue, 01 Sep 2020 13:11:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     trix@...hat.com
Cc:     pshelar@....org, kuba@...nel.org, natechancellor@...il.com,
        ndesaulniers@...gle.com, netdev@...r.kernel.org,
        dev@...nvswitch.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: openvswitch: pass NULL for unused parameters

From: trix@...hat.com
Date: Sun, 30 Aug 2020 14:26:30 -0700

> Passing unused parameters is a waste.

Poorly predicted branches are an even bigger waste.

I'm not a big fan of this change and others have asked for performance
analysis to be performed.

So I'm not applying this as-is, sorry.

It's also not great to see that CLANG can't make use of the caller's
__always_unused directive to guide these warnings.