338 lines
12 KiB
Plaintext
338 lines
12 KiB
Plaintext
The following is a list of files and features that are going to be
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removed in the kernel source tree. Every entry should contain what
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exactly is going away, why it is happening, and who is going to be doing
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the work. When the feature is removed from the kernel, it should also
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be removed from this file.
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---------------------------
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What: old static regulatory information and ieee80211_regdom module parameter
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When: 2.6.29
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Why: The old regulatory infrastructure has been replaced with a new one
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which does not require statically defined regulatory domains. We do
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not want to keep static regulatory domains in the kernel due to the
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the dynamic nature of regulatory law and localization. We kept around
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the old static definitions for the regulatory domains of:
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* US
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* JP
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* EU
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and used by default the US when CONFIG_WIRELESS_OLD_REGULATORY was
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set. We also kept around the ieee80211_regdom module parameter in case
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some applications were relying on it. Changing regulatory domains
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can now be done instead by using nl80211, as is done with iw.
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Who: Luis R. Rodriguez <lrodriguez@atheros.com>
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---------------------------
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What: dev->power.power_state
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When: July 2007
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Why: Broken design for runtime control over driver power states, confusing
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driver-internal runtime power management with: mechanisms to support
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system-wide sleep state transitions; event codes that distinguish
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different phases of swsusp "sleep" transitions; and userspace policy
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inputs. This framework was never widely used, and most attempts to
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use it were broken. Drivers should instead be exposing domain-specific
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interfaces either to kernel or to userspace.
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Who: Pavel Machek <pavel@suse.cz>
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---------------------------
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What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
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When: December 2008
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Files: include/linux/video_decoder.h include/linux/videodev.h
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Check: include/linux/video_decoder.h include/linux/videodev.h
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Why: V4L1 AP1 was replaced by V4L2 API during migration from 2.4 to 2.6
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series. The old API have lots of drawbacks and don't provide enough
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means to work with all video and audio standards. The newer API is
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already available on the main drivers and should be used instead.
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Newer drivers should use v4l_compat_translate_ioctl function to handle
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old calls, replacing to newer ones.
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Decoder iocts are using internally to allow video drivers to
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communicate with video decoders. This should also be improved to allow
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V4L2 calls being translated into compatible internal ioctls.
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Compatibility ioctls will be provided, for a while, via
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v4l1-compat module.
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Who: Mauro Carvalho Chehab <mchehab@infradead.org>
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---------------------------
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What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
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When: November 2005
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Files: drivers/pcmcia/: pcmcia_ioctl.c
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Why: With the 16-bit PCMCIA subsystem now behaving (almost) like a
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normal hotpluggable bus, and with it using the default kernel
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infrastructure (hotplug, driver core, sysfs) keeping the PCMCIA
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control ioctl needed by cardmgr and cardctl from pcmcia-cs is
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unnecessary, and makes further cleanups and integration of the
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PCMCIA subsystem into the Linux kernel device driver model more
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difficult. The features provided by cardmgr and cardctl are either
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handled by the kernel itself now or are available in the new
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pcmciautils package available at
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http://kernel.org/pub/linux/utils/kernel/pcmcia/
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Who: Dominik Brodowski <linux@brodo.de>
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---------------------------
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What: sys_sysctl
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When: September 2010
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Option: CONFIG_SYSCTL_SYSCALL
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Why: The same information is available in a more convenient from
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/proc/sys, and none of the sysctl variables appear to be
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important performance wise.
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Binary sysctls are a long standing source of subtle kernel
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bugs and security issues.
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When I looked several months ago all I could find after
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searching several distributions were 5 user space programs and
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glibc (which falls back to /proc/sys) using this syscall.
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The man page for sysctl(2) documents it as unusable for user
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space programs.
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sysctl(2) is not generally ABI compatible to a 32bit user
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space application on a 64bit and a 32bit kernel.
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For the last several months the policy has been no new binary
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sysctls and no one has put forward an argument to use them.
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Binary sysctls issues seem to keep happening appearing so
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properly deprecating them (with a warning to user space) and a
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2 year grace warning period will mean eventually we can kill
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them and end the pain.
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In the mean time individual binary sysctls can be dealt with
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in a piecewise fashion.
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Who: Eric Biederman <ebiederm@xmission.com>
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---------------------------
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What: remove EXPORT_SYMBOL(kernel_thread)
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When: August 2006
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Files: arch/*/kernel/*_ksyms.c
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Check: kernel_thread
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Why: kernel_thread is a low-level implementation detail. Drivers should
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use the <linux/kthread.h> API instead which shields them from
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implementation details and provides a higherlevel interface that
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prevents bugs and code duplication
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Who: Christoph Hellwig <hch@lst.de>
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---------------------------
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What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
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(temporary transition config option provided until then)
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The transition config option will also be removed at the same time.
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When: before 2.6.19
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Why: Unused symbols are both increasing the size of the kernel binary
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and are often a sign of "wrong API"
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Who: Arjan van de Ven <arjan@linux.intel.com>
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---------------------------
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What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
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When: October 2008
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Why: The stacking of class devices makes these values misleading and
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inconsistent.
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Class devices should not carry any of these properties, and bus
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devices have SUBSYTEM and DRIVER as a replacement.
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Who: Kay Sievers <kay.sievers@suse.de>
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---------------------------
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What: ACPI procfs interface
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When: July 2008
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Why: ACPI sysfs conversion should be finished by January 2008.
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ACPI procfs interface will be removed in July 2008 so that
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there is enough time for the user space to catch up.
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Who: Zhang Rui <rui.zhang@intel.com>
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---------------------------
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What: /proc/acpi/button
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When: August 2007
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Why: /proc/acpi/button has been replaced by events to the input layer
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since 2.6.20.
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Who: Len Brown <len.brown@intel.com>
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---------------------------
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What: /proc/acpi/event
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When: February 2008
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Why: /proc/acpi/event has been replaced by events via the input layer
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and netlink since 2.6.23.
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Who: Len Brown <len.brown@intel.com>
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---------------------------
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What: libata spindown skipping and warning
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When: Dec 2008
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Why: Some halt(8) implementations synchronize caches for and spin
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down libata disks because libata didn't use to spin down disk on
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system halt (only synchronized caches).
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Spin down on system halt is now implemented. sysfs node
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/sys/class/scsi_disk/h:c:i:l/manage_start_stop is present if
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spin down support is available.
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Because issuing spin down command to an already spun down disk
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makes some disks spin up just to spin down again, libata tracks
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device spindown status to skip the extra spindown command and
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warn about it.
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This is to give userspace tools the time to get updated and will
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be removed after userspace is reasonably updated.
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Who: Tejun Heo <htejun@gmail.com>
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---------------------------
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What: i386/x86_64 bzImage symlinks
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When: April 2010
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Why: The i386/x86_64 merge provides a symlink to the old bzImage
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location so not yet updated user space tools, e.g. package
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scripts, do not break.
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Who: Thomas Gleixner <tglx@linutronix.de>
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---------------------------
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What (Why):
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- include/linux/netfilter_ipv4/ipt_TOS.h ipt_tos.h header files
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(superseded by xt_TOS/xt_tos target & match)
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- "forwarding" header files like ipt_mac.h in
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include/linux/netfilter_ipv4/ and include/linux/netfilter_ipv6/
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- xt_CONNMARK match revision 0
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(superseded by xt_CONNMARK match revision 1)
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- xt_MARK target revisions 0 and 1
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(superseded by xt_MARK match revision 2)
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- xt_connmark match revision 0
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(superseded by xt_connmark match revision 1)
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- xt_conntrack match revision 0
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(superseded by xt_conntrack match revision 1)
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- xt_iprange match revision 0,
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include/linux/netfilter_ipv4/ipt_iprange.h
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(superseded by xt_iprange match revision 1)
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- xt_mark match revision 0
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(superseded by xt_mark match revision 1)
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- xt_recent: the old ipt_recent proc dir
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(superseded by /proc/net/xt_recent)
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When: January 2009 or Linux 2.7.0, whichever comes first
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Why: Superseded by newer revisions or modules
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Who: Jan Engelhardt <jengelh@computergmbh.de>
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---------------------------
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What: b43 support for firmware revision < 410
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When: July 2008
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Why: The support code for the old firmware hurts code readability/maintainability
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and slightly hurts runtime performance. Bugfixes for the old firmware
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are not provided by Broadcom anymore.
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Who: Michael Buesch <mb@bu3sch.de>
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---------------------------
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What: usedac i386 kernel parameter
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When: 2.6.27
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Why: replaced by allowdac and no dac combination
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Who: Glauber Costa <gcosta@redhat.com>
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---------------------------
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What: remove HID compat support
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When: 2.6.29
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Why: needed only as a temporary solution until distros fix themselves up
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Who: Jiri Slaby <jirislaby@gmail.com>
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---------------------------
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What: print_fn_descriptor_symbol()
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When: October 2009
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Why: The %pF vsprintf format provides the same functionality in a
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simpler way. print_fn_descriptor_symbol() is deprecated but
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still present to give out-of-tree modules time to change.
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Who: Bjorn Helgaas <bjorn.helgaas@hp.com>
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---------------------------
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What: /sys/o2cb symlink
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When: January 2010
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Why: /sys/fs/o2cb is the proper location for this information - /sys/o2cb
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exists as a symlink for backwards compatibility for old versions of
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ocfs2-tools. 2 years should be sufficient time to phase in new versions
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which know to look in /sys/fs/o2cb.
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Who: ocfs2-devel@oss.oracle.com
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---------------------------
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What: SCTP_GET_PEER_ADDRS_NUM_OLD, SCTP_GET_PEER_ADDRS_OLD,
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SCTP_GET_LOCAL_ADDRS_NUM_OLD, SCTP_GET_LOCAL_ADDRS_OLD
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When: June 2009
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Why: A newer version of the options have been introduced in 2005 that
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removes the limitions of the old API. The sctp library has been
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converted to use these new options at the same time. Any user
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space app that directly uses the old options should convert to using
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the new options.
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Who: Vlad Yasevich <vladislav.yasevich@hp.com>
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---------------------------
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What: CONFIG_THERMAL_HWMON
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When: January 2009
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Why: This option was introduced just to allow older lm-sensors userspace
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to keep working over the upgrade to 2.6.26. At the scheduled time of
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removal fixed lm-sensors (2.x or 3.x) should be readily available.
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Who: Rene Herman <rene.herman@gmail.com>
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---------------------------
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What: Code that is now under CONFIG_WIRELESS_EXT_SYSFS
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(in net/core/net-sysfs.c)
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When: After the only user (hal) has seen a release with the patches
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for enough time, probably some time in 2010.
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Why: Over 1K .text/.data size reduction, data is available in other
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ways (ioctls)
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Who: Johannes Berg <johannes@sipsolutions.net>
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---------------------------
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What: CONFIG_NF_CT_ACCT
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When: 2.6.29
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Why: Accounting can now be enabled/disabled without kernel recompilation.
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Currently used only to set a default value for a feature that is also
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controlled by a kernel/module/sysfs/sysctl parameter.
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Who: Krzysztof Piotr Oledzki <ole@ans.pl>
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---------------------------
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What: i2c_attach_client(), i2c_detach_client(), i2c_driver->detach_client()
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When: 2.6.29 (ideally) or 2.6.30 (more likely)
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Why: Deprecated by the new (standard) device driver binding model. Use
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i2c_driver->probe() and ->remove() instead.
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Who: Jean Delvare <khali@linux-fr.org>
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---------------------------
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What: fscher and fscpos drivers
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When: June 2009
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Why: Deprecated by the new fschmd driver.
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Who: Hans de Goede <hdegoede@redhat.com>
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Jean Delvare <khali@linux-fr.org>
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---------------------------
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What: SELinux "compat_net" functionality
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When: 2.6.30 at the earliest
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Why: In 2.6.18 the Secmark concept was introduced to replace the "compat_net"
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network access control functionality of SELinux. Secmark offers both
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better performance and greater flexibility than the "compat_net"
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mechanism. Now that the major Linux distributions have moved to
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Secmark, it is time to deprecate the older mechanism and start the
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process of removing the old code.
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Who: Paul Moore <paul.moore@hp.com>
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