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SubjectRe: [PATCH 06/60] sysfs: clarify SYSFS_DEPRECATED help text
Greg Kroah-Hartman writes:
> From: Kay Sievers <kay.sievers@vrfy.org>
>
> This should make the help text of SYSFS_DEPRECATED more clear, that this
> is _not_ about (what some people think it is) suppressing a few symlinks
> and variables, but a different sysfs _layout_ with new features.
>
> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
> ---
> init/Kconfig | 44 +++++++++++++++++++++++++++-----------------
> 1 files changed, 27 insertions(+), 17 deletions(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index 52847ee..d9d3dba 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -423,27 +423,37 @@ config SYSFS_DEPRECATED
> bool
>
> config SYSFS_DEPRECATED_V2
> - bool "Create deprecated sysfs files"
> + bool "Create deprecated sysfs layout for older userspace tools"
> depends on SYSFS
> default y
> select SYSFS_DEPRECATED
> help
> - This option creates deprecated symlinks such as the
> - "device"-link, the <subsystem>:<name>-link, and the
> - "bus"-link. It may also add deprecated key in the
> - uevent environment.
> - None of these features or values should be used today, as
> - they export driver core implementation details to userspace
> - or export properties which can't be kept stable across kernel
> - releases.
> -
> - If enabled, this option will also move any device structures
> - that belong to a class, back into the /sys/class hierarchy, in
> - order to support older versions of udev and some userspace
> - programs.
> -
> - If you are using a distro with the most recent userspace
> - packages, it should be safe to say N here.
> + This option switches the layout of sysfs to the deprecated
> + version.
> +
> + The current sysfs layout features a unified device tree at
> + /sys/devices/, which is able to express a hierarchy between
> + class devices. If the deprecated option is set to Y, the
> + unified device tree is split into a bus device tree at
> + /sys/devices/ and several individual class device trees at
> + /sys/class/. The class and bus devices will be connected by
> + "<subsystem>:<name>" and the "device" links. The "block"
> + class devices, will not show up in /sys/class/block/. Some
> + subsystems will suppress the creation of some devices which
> + depend on the unified device tree.
> +
> + This option is not a pure compatibility option that can
> + be safely enabled on newer distributions. It will change the
> + layout of sysfs to the non-extensible deprecated version,
> + and disable some features, which can not be exported without
> + confusing older userspace tools. Since 2007/2008 all major
> + distributions do not enable this option, and ship no tools which
> + depend on the deprecated layout or this option.
> +
> + If you are using a new kernel on an older distribution, or use
> + older userspace tools, you might need to say Y here. Do not say Y,
> + if the original kernel, that came with your distribution, has
> + this option set to N.

Instead of making vague references to "older" tools, could someone
please make a list of the major tools that depend on sysfs, and the
minimal/oldest versions needed for the non-deprecated layout?

/Mikael


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