[PATCH] fix races and leaks in vfs_quota_on() users

[linux-2.6] / Documentation / feature-removal-schedule.txt

The following is a list of files and features that are going to be
removed in the kernel source tree.  Every entry should contain what
exactly is going away, why it is happening, and who is going to be doing
the work.  When the feature is removed from the kernel, it should also
be removed from this file.

---------------------------

What:   dev->power.power_state
When:   July 2007
Why:    Broken design for runtime control over driver power states, confusing
        driver-internal runtime power management with:  mechanisms to support
        system-wide sleep state transitions; event codes that distinguish
        different phases of swsusp "sleep" transitions; and userspace policy
        inputs.  This framework was never widely used, and most attempts to
        use it were broken.  Drivers should instead be exposing domain-specific
        interfaces either to kernel or to userspace.
Who:    Pavel Machek <pavel@suse.cz>

---------------------------

What:   old NCR53C9x driver
When:   October 2007
Why:    Replaced by the much better esp_scsi driver.  Actual low-level
        driver can be ported over almost trivially.
Who:    David Miller <davem@davemloft.net>
        Christoph Hellwig <hch@lst.de>

---------------------------

What:   Video4Linux API 1 ioctls and video_decoder.h from Video devices.
When:   December 2008
Files:  include/linux/video_decoder.h include/linux/videodev.h
Check:  include/linux/video_decoder.h include/linux/videodev.h
Why:    V4L1 AP1 was replaced by V4L2 API during migration from 2.4 to 2.6
        series. The old API have lots of drawbacks and don't provide enough
        means to work with all video and audio standards. The newer API is
        already available on the main drivers and should be used instead.
        Newer drivers should use v4l_compat_translate_ioctl function to handle
        old calls, replacing to newer ones.
        Decoder iocts are using internally to allow video drivers to
        communicate with video decoders. This should also be improved to allow
        V4L2 calls being translated into compatible internal ioctls.
        Compatibility ioctls will be provided, for a while, via 
        v4l1-compat module. 
Who:    Mauro Carvalho Chehab <mchehab@infradead.org>

---------------------------

What:   old tuner-3036 i2c driver
When:   2.6.28
Why:    This driver is for VERY old i2c-over-parallel port teletext receiver
        boxes. Rather then spending effort on converting this driver to V4L2,
        and since it is extremely unlikely that anyone still uses one of these
        devices, it was decided to drop it.
Who:    Hans Verkuil <hverkuil@xs4all.nl>
        Mauro Carvalho Chehab <mchehab@infradead.org>

 ---------------------------

What:   V4L2 dpc7146 driver
When:   2.6.28
Why:    Old driver for the dpc7146 demonstration board that is no longer
        relevant. The last time this was tested on actual hardware was
        probably around 2002. Since this is a driver for a demonstration
        board the decision was made to remove it rather than spending a
        lot of effort continually updating this driver to stay in sync
        with the latest internal V4L2 or I2C API.
Who:    Hans Verkuil <hverkuil@xs4all.nl>
        Mauro Carvalho Chehab <mchehab@infradead.org>

---------------------------

What:   PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
When:   November 2005
Files:  drivers/pcmcia/: pcmcia_ioctl.c
Why:    With the 16-bit PCMCIA subsystem now behaving (almost) like a
        normal hotpluggable bus, and with it using the default kernel
        infrastructure (hotplug, driver core, sysfs) keeping the PCMCIA
        control ioctl needed by cardmgr and cardctl from pcmcia-cs is
        unnecessary, and makes further cleanups and integration of the
        PCMCIA subsystem into the Linux kernel device driver model more
        difficult. The features provided by cardmgr and cardctl are either
        handled by the kernel itself now or are available in the new
        pcmciautils package available at
        http://kernel.org/pub/linux/utils/kernel/pcmcia/
Who:    Dominik Brodowski <linux@brodo.de>

---------------------------

What:   sys_sysctl
When:   September 2010
Option: CONFIG_SYSCTL_SYSCALL
Why:    The same information is available in a more convenient from
        /proc/sys, and none of the sysctl variables appear to be
        important performance wise.

        Binary sysctls are a long standing source of subtle kernel
        bugs and security issues.

        When I looked several months ago all I could find after
        searching several distributions were 5 user space programs and
        glibc (which falls back to /proc/sys) using this syscall.

        The man page for sysctl(2) documents it as unusable for user
        space programs.

        sysctl(2) is not generally ABI compatible to a 32bit user
        space application on a 64bit and a 32bit kernel.

        For the last several months the policy has been no new binary
        sysctls and no one has put forward an argument to use them.

        Binary sysctls issues seem to keep happening appearing so
        properly deprecating them (with a warning to user space) and a
        2 year grace warning period will mean eventually we can kill
        them and end the pain.

        In the mean time individual binary sysctls can be dealt with
        in a piecewise fashion.

Who:    Eric Biederman <ebiederm@xmission.com>

---------------------------

What:   remove EXPORT_SYMBOL(kernel_thread)
When:   August 2006
Files:  arch/*/kernel/*_ksyms.c
Check:  kernel_thread
Why:    kernel_thread is a low-level implementation detail.  Drivers should
        use the <linux/kthread.h> API instead which shields them from
        implementation details and provides a higherlevel interface that
        prevents bugs and code duplication
Who:    Christoph Hellwig <hch@lst.de>

---------------------------

What:   eepro100 network driver
When:   January 2007
Why:    replaced by the e100 driver
Who:    Adrian Bunk <bunk@stusta.de>

---------------------------

What:   Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
        (temporary transition config option provided until then)
        The transition config option will also be removed at the same time.
When:   before 2.6.19
Why:    Unused symbols are both increasing the size of the kernel binary
        and are often a sign of "wrong API"
Who:    Arjan van de Ven <arjan@linux.intel.com>

---------------------------

What:   PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
When:   October 2008
Why:    The stacking of class devices makes these values misleading and
        inconsistent.
        Class devices should not carry any of these properties, and bus
        devices have SUBSYTEM and DRIVER as a replacement.
Who:    Kay Sievers <kay.sievers@suse.de>

---------------------------

What:   ACPI procfs interface
When:   July 2008
Why:    ACPI sysfs conversion should be finished by January 2008.
        ACPI procfs interface will be removed in July 2008 so that
        there is enough time for the user space to catch up.
Who:    Zhang Rui <rui.zhang@intel.com>

---------------------------

What:   /proc/acpi/button
When:   August 2007
Why:    /proc/acpi/button has been replaced by events to the input layer
        since 2.6.20.
Who:    Len Brown <len.brown@intel.com>

---------------------------

What:   /proc/acpi/event
When:   February 2008
Why:    /proc/acpi/event has been replaced by events via the input layer
        and netlink since 2.6.23.
Who:    Len Brown <len.brown@intel.com>

---------------------------

What: libata spindown skipping and warning
When: Dec 2008
Why:  Some halt(8) implementations synchronize caches for and spin
      down libata disks because libata didn't use to spin down disk on
      system halt (only synchronized caches).
      Spin down on system halt is now implemented.  sysfs node
      /sys/class/scsi_disk/h:c:i:l/manage_start_stop is present if
      spin down support is available.
      Because issuing spin down command to an already spun down disk
      makes some disks spin up just to spin down again, libata tracks
      device spindown status to skip the extra spindown command and
      warn about it.
      This is to give userspace tools the time to get updated and will
      be removed after userspace is reasonably updated.
Who:  Tejun Heo <htejun@gmail.com>

---------------------------

What: The arch/ppc and include/asm-ppc directories
When: Jun 2008
Why:  The arch/powerpc tree is the merged architecture for ppc32 and ppc64
      platforms.  Currently there are efforts underway to port the remaining
      arch/ppc platforms to the merged tree.  New submissions to the arch/ppc
      tree have been frozen with the 2.6.22 kernel release and that tree will
      remain in bug-fix only mode until its scheduled removal.  Platforms
      that are not ported by June 2008 will be removed due to the lack of an
      interested maintainer.
Who:  linuxppc-dev@ozlabs.org

---------------------------

What:   i386/x86_64 bzImage symlinks
When:   April 2010

Why:    The i386/x86_64 merge provides a symlink to the old bzImage
        location so not yet updated user space tools, e.g. package
        scripts, do not break.
Who:    Thomas Gleixner <tglx@linutronix.de>

---------------------------

What (Why):
        - include/linux/netfilter_ipv4/ipt_TOS.h ipt_tos.h header files
          (superseded by xt_TOS/xt_tos target & match)

        - "forwarding" header files like ipt_mac.h in
          include/linux/netfilter_ipv4/ and include/linux/netfilter_ipv6/

        - xt_CONNMARK match revision 0
          (superseded by xt_CONNMARK match revision 1)

        - xt_MARK target revisions 0 and 1
          (superseded by xt_MARK match revision 2)

        - xt_connmark match revision 0
          (superseded by xt_connmark match revision 1)

        - xt_conntrack match revision 0
          (superseded by xt_conntrack match revision 1)

        - xt_iprange match revision 0,
          include/linux/netfilter_ipv4/ipt_iprange.h
          (superseded by xt_iprange match revision 1)

        - xt_mark match revision 0
          (superseded by xt_mark match revision 1)

When:   January 2009 or Linux 2.7.0, whichever comes first
Why:    Superseded by newer revisions or modules
Who:    Jan Engelhardt <jengelh@computergmbh.de>

---------------------------

What:   b43 support for firmware revision < 410
When:   July 2008
Why:    The support code for the old firmware hurts code readability/maintainability
        and slightly hurts runtime performance. Bugfixes for the old firmware
        are not provided by Broadcom anymore.
Who:    Michael Buesch <mb@bu3sch.de>

---------------------------

What:   init_mm export
When:   2.6.26
Why:    Not used in-tree. The current out-of-tree users used it to
        work around problems in the CPA code which should be resolved
        by now. One usecase was described to provide verification code
        of the CPA operation. That's a good idea in general, but such
        code / infrastructure should be in the kernel and not in some
        out-of-tree driver.
Who:    Thomas Gleixner <tglx@linutronix.de>

----------------------------

What:   usedac i386 kernel parameter
When:   2.6.27
Why:    replaced by allowdac and no dac combination
Who:    Glauber Costa <gcosta@redhat.com>

---------------------------

What:   old style serial driver for ColdFire (CONFIG_SERIAL_COLDFIRE)
When:   2.6.28
Why:    This driver still uses the old interface and has been replaced
        by CONFIG_SERIAL_MCF.
Who:    Sebastian Siewior <sebastian@breakpoint.cc>

---------------------------

What:   /sys/o2cb symlink
When:   January 2010
Why:    /sys/fs/o2cb is the proper location for this information - /sys/o2cb
        exists as a symlink for backwards compatibility for old versions of
        ocfs2-tools. 2 years should be sufficient time to phase in new versions
        which know to look in /sys/fs/o2cb.
Who:    ocfs2-devel@oss.oracle.com

---------------------------

What:   SCTP_GET_PEER_ADDRS_NUM_OLD, SCTP_GET_PEER_ADDRS_OLD,
        SCTP_GET_LOCAL_ADDRS_NUM_OLD, SCTP_GET_LOCAL_ADDRS_OLD
When:   June 2009
Why:    A newer version of the options have been introduced in 2005 that
        removes the limitions of the old API.  The sctp library has been
        converted to use these new options at the same time.  Any user
        space app that directly uses the old options should convert to using
        the new options.
Who:    Vlad Yasevich <vladislav.yasevich@hp.com>

---------------------------

What:   CONFIG_THERMAL_HWMON
When:   January 2009
Why:    This option was introduced just to allow older lm-sensors userspace
        to keep working over the upgrade to 2.6.26. At the scheduled time of
        removal fixed lm-sensors (2.x or 3.x) should be readily available.
Who:    Rene Herman <rene.herman@gmail.com>

---------------------------

What:   Code that is now under CONFIG_WIRELESS_EXT_SYSFS
        (in net/core/net-sysfs.c)
When:   After the only user (hal) has seen a release with the patches
        for enough time, probably some time in 2010.
Why:    Over 1K .text/.data size reduction, data is available in other
        ways (ioctls)
Who:    Johannes Berg <johannes@sipsolutions.net>

---------------------------

What: CONFIG_NF_CT_ACCT
When: 2.6.29
Why:  Accounting can now be enabled/disabled without kernel recompilation.
      Currently used only to set a default value for a feature that is also
      controlled by a kernel/module/sysfs/sysctl parameter.
Who:  Krzysztof Piotr Oledzki <ole@ans.pl>