linux-kernel - Re: [PATCH] driver core: remove CONFIG_SYSFS_DEPRECATED and CONFIG_SYSFS_DEPRECATED

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Date:   Thu, 23 Feb 2023 09:04:32 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-block@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] driver core: remove CONFIG_SYSFS_DEPRECATED and
 CONFIG_SYSFS_DEPRECATED_V2

On 2/23/23 12:33 AM, Greg Kroah-Hartman wrote:
> CONFIG_SYSFS_DEPRECATED was added in commit 88a22c985e35
> ("CONFIG_SYSFS_DEPRECATED") in 2006 to allow systems with older versions
> of some tools (i.e. Fedora 3's version of udev) to boot properly.  Four
> years later, in 2010, the option was attempted to be removed as most of
> userspace should have been fixed up properly by then, but some kernel
> developers clung to those old systems and refused to update, so we added
> CONFIG_SYSFS_DEPRECATED_V2 in commit e52eec13cd6b ("SYSFS: Allow boot
> time switching between deprecated and modern sysfs layout") to allow
> them to continue to boot properly, and we allowed a boot time parameter
> to be used to switch back to the old format if needed.
> 
> Over time, the logic that was covered under these config options was
> slowly removed from individual driver subsystems successfully, removed,
> and the only thing that is now left in the kernel are some changes in
> the block layer's representation in sysfs where real directories are
> used instead of symlinks like normal.
> 
> Because the original changes were done to userspace tools in 2006, and
> all distros that use those tools are long end-of-life, and older
> non-udev-based systems do not care about the block layer's sysfs
> representation, it is time to finally remove this old logic and the
> config entries from the kernel.

Acked-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe