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242 lines
8.9 KiB
Plaintext
242 lines
8.9 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: devfs
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When: July 2005
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Files: fs/devfs/*, include/linux/devfs_fs*.h and assorted devfs
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function calls throughout the kernel tree
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Why: It has been unmaintained for a number of years, has unfixable
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races, contains a naming policy within the kernel that is
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against the LSB, and can be replaced by using udev.
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Who: Greg Kroah-Hartman <greg@kroah.com>
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---------------------------
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What: RAW driver (CONFIG_RAW_DRIVER)
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When: December 2005
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Why: declared obsolete since kernel 2.6.3
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O_DIRECT can be used instead
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Who: Adrian Bunk <bunk@stusta.de>
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---------------------------
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What: drivers that were depending on OBSOLETE_OSS_DRIVER
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(config options already removed)
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When: before 2.6.19
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Why: OSS drivers with ALSA replacements
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Who: Adrian Bunk <bunk@stusta.de>
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---------------------------
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What: RCU API moves to EXPORT_SYMBOL_GPL
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When: April 2006
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Files: include/linux/rcupdate.h, kernel/rcupdate.c
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Why: Outside of Linux, the only implementations of anything even
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vaguely resembling RCU that I am aware of are in DYNIX/ptx,
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VM/XA, Tornado, and K42. I do not expect anyone to port binary
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drivers or kernel modules from any of these, since the first two
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are owned by IBM and the last two are open-source research OSes.
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So these will move to GPL after a grace period to allow
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people, who might be using implementations that I am not aware
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of, to adjust to this upcoming change.
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Who: Paul E. McKenney <paulmck@us.ibm.com>
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---------------------------
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What: raw1394: requests of type RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN
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When: November 2005
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Why: Deprecated in favour of the new ioctl-based rawiso interface, which is
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more efficient. You should really be using libraw1394 for raw1394
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access anyway.
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Who: Jody McIntyre <scjody@steamballoon.com>
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---------------------------
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What: sbp2: module parameter "force_inquiry_hack"
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When: July 2006
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Why: Superceded by parameter "workarounds". Both parameters are meant to be
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used ad-hoc and for single devices only, i.e. not in modprobe.conf,
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therefore the impact of this feature replacement should be low.
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Who: Stefan Richter <stefanr@s5r6.in-berlin.de>
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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: July 2006
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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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Who: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
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What: remove EXPORT_SYMBOL(insert_resource)
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When: April 2006
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Files: kernel/resource.c
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Why: No modular usage in the kernel.
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Who: Adrian Bunk <bunk@stusta.de>
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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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What: ip_queue and ip6_queue (old ipv4-only and ipv6-only netfilter queue)
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When: December 2005
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Why: This interface has been obsoleted by the new layer3-independent
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"nfnetlink_queue". The Kernel interface is compatible, so the old
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ip[6]tables "QUEUE" targets still work and will transparently handle
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all packets into nfnetlink queue number 0. Userspace users will have
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to link against API-compatible library on top of libnfnetlink_queue
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instead of the current 'libipq'.
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Who: Harald Welte <laforge@netfilter.org>
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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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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: CONFIG_FORCED_INLINING
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When: June 2006
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Why: Config option is there to see if gcc is good enough. (in january
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2006). If it is, the behavior should just be the default. If it's not,
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the option should just go away entirely.
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Who: Arjan van de Ven
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---------------------------
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What: START_ARRAY ioctl for md
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When: July 2006
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Files: drivers/md/md.c
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Why: Not reliable by design - can fail when most needed.
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Alternatives exist
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Who: NeilBrown <neilb@suse.de>
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---------------------------
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What: au1x00_uart driver
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When: January 2006
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Why: The 8250 serial driver now has the ability to deal with the differences
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between the standard 8250 family of UARTs and their slightly strange
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brother on Alchemy SOCs. The loss of features is not considered an
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issue.
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Who: Ralf Baechle <ralf@linux-mips.org>
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---------------------------
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What: eepro100 network driver
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When: January 2007
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Why: replaced by the e100 driver
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Who: Adrian Bunk <bunk@stusta.de>
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---------------------------
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What: pci_module_init(driver)
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When: January 2007
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Why: Is replaced by pci_register_driver(pci_driver).
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Who: Richard Knutsson <ricknu-0@student.ltu.se> and Greg Kroah-Hartman <gregkh@suse.de>
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---------------------------
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What: Usage of invalid timevals in setitimer
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When: March 2007
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Why: POSIX requires to validate timevals in the setitimer call. This
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was never done by Linux. The invalid (e.g. negative timevals) were
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silently converted to more or less random timeouts and intervals.
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Until the removal a per boot limited number of warnings is printed
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and the timevals are sanitized.
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Who: Thomas Gleixner <tglx@linutronix.de>
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---------------------------
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What: I2C interface of the it87 driver
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When: January 2007
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Why: The ISA interface is faster and should be always available. The I2C
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probing is also known to cause trouble in at least one case (see
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bug #5889.)
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Who: Jean Delvare <khali@linux-fr.org>
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---------------------------
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What: remove EXPORT_SYMBOL(tasklist_lock)
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When: August 2006
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Files: kernel/fork.c
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Why: tasklist_lock protects the kernel internal task list. Modules have
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no business looking at it, and all instances in drivers have been due
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to use of too-lowlevel APIs. Having this symbol exported prevents
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moving to more scalable locking schemes for the task list.
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Who: Christoph Hellwig <hch@lst.de>
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---------------------------
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What: mount/umount uevents
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When: February 2007
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Why: These events are not correct, and do not properly let userspace know
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when a file system has been mounted or unmounted. Userspace should
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poll the /proc/mounts file instead to detect this properly.
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Who: Greg Kroah-Hartman <gregkh@suse.de>
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---------------------------
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What: USB driver API moves to EXPORT_SYMBOL_GPL
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When: Febuary 2008
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Files: include/linux/usb.h, drivers/usb/core/driver.c
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Why: The USB subsystem has changed a lot over time, and it has been
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possible to create userspace USB drivers using usbfs/libusb/gadgetfs
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that operate as fast as the USB bus allows. Because of this, the USB
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subsystem will not be allowing closed source kernel drivers to
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register with it, after this grace period is over. If anyone needs
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any help in converting their closed source drivers over to use the
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userspace filesystems, please contact the
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linux-usb-devel@lists.sourceforge.net mailing list, and the developers
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there will be glad to help you out.
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Who: Greg Kroah-Hartman <gregkh@suse.de>
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---------------------------
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What: find_trylock_page
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When: January 2007
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Why: The interface no longer has any callers left in the kernel. It
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is an odd interface (compared with other find_*_page functions), in
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that it does not take a refcount to the page, only the page lock.
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It should be replaced with find_get_page or find_lock_page if possible.
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This feature removal can be reevaluated if users of the interface
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cannot cleanly use something else.
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Who: Nick Piggin <npiggin@suse.de>
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---------------------------
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