netdev - Re: [PATCH] Update core.c

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Message-ID: <20241002222145.GJ4017910@ZenIV>
Date: Wed, 2 Oct 2024 23:21:45 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Conor Dooley <conor@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>,
	Okan Tumuklu <okantumukluu@...il.com>, shuah@...nel.org,
	linux-kernel@...r.kernel.org, krzk@...nel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Update core.c

On Wed, Oct 02, 2024 at 06:27:51AM -0700, Jakub Kicinski wrote:
> On Mon, 30 Sep 2024 23:20:45 +0100 Conor Dooley wrote:
> > (do netdev folks even want scoped cleanup?),
> 
> Since I have it handy... :)
> 
> Quoting documentation:
> 
>   Using device-managed and cleanup.h constructs
>   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   
>   Netdev remains skeptical about promises of all "auto-cleanup" APIs,
>   including even ``devm_`` helpers, historically. They are not the preferred
>   style of implementation, merely an acceptable one.
>   
>   Use of ``guard()`` is discouraged within any function longer than 20 lines,
>   ``scoped_guard()`` is considered more readable. Using normal lock/unlock is
>   still (weakly) preferred.
>   
>   Low level cleanup constructs (such as ``__free()``) can be used when building
>   APIs and helpers, especially scoped iterators. However, direct use of
>   ``__free()`` within networking core and drivers is discouraged.
>   Similar guidance applies to declaring variables mid-function.
>   
> See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#using-device-managed-and-cleanup-h-constructs

Bravo.  Mind if that gets stolen for VFS as well?