linux-kernel - Re: [PATCH 4/7] kref: Remove WARN

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Date:   Wed, 15 Mar 2017 10:46:56 +0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>, peterz@...radead.org
Subject: Re: [PATCH 4/7] kref: Remove WARN_ON for NULL release functions

On Tue, Mar 14, 2017 at 07:14:28PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The kref functions check for NULL release functions.
> This WARN_ON seems rather pointless. We will eventually release and
> then just crash nicely. It is also somewhat expensive because
> these functions are inlined in a lot of places.
> Removing the WARN_ONs saves around 2.3k in this kernel
> (likely more in others with more drivers)
> 
>    text    data     bss     dec     hex filename
> 9083992 5367600 11116544        25568136        1862388 vmlinux-before-load-avg
> 9070166 5367600 11116544        25554310        185ed86 vmlinux-load-avg

WARN_ON() is heavy, didn't realize that.

No objection from me.

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>