![Hans de Goede](/assets/img/avatar_default.png)
This patch adds the ov511, quickcam_messenger, w9968cf, stv680 and ovcamchip v4l1 drivers to the feature removal schedule as the devices they support are now all also supported by v4l2 gspca sub drivers. This patch also adds the v4l2 vc0301 driver for removal as it duplicates functionality of the gspca_zc3xx driver, zc0301 only supports 2 USB-ID's (because it only supports a limited set of sensors) wich are also supported by the gspca_zc3xx driver (which supports 53 USB-ID's in total). [mchehab@redhat.com: change "when" to 2.6.35] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
545 lines
20 KiB
Plaintext
545 lines
20 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: USER_SCHED
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When: 2.6.34
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Why: USER_SCHED was implemented as a proof of concept for group scheduling.
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The effect of USER_SCHED can already be achieved from userspace with
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the help of libcgroup. The removal of USER_SCHED will also simplify
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the scheduler code with the removal of one major ifdef. There are also
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issues USER_SCHED has with USER_NS. A decision was taken not to fix
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those and instead remove USER_SCHED. Also new group scheduling
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features will not be implemented for USER_SCHED.
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Who: Dhaval Giani <dhaval@linux.vnet.ibm.com>
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---------------------------
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What: PRISM54
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When: 2.6.34
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Why: prism54 FullMAC PCI / Cardbus devices used to be supported only by the
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prism54 wireless driver. After Intersil stopped selling these
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devices in preference for the newer more flexible SoftMAC devices
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a SoftMAC device driver was required and prism54 did not support
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them. The p54pci driver now exists and has been present in the kernel for
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a while. This driver supports both SoftMAC devices and FullMAC devices.
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The main difference between these devices was the amount of memory which
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could be used for the firmware. The SoftMAC devices support a smaller
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amount of memory. Because of this the SoftMAC firmware fits into FullMAC
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devices's memory. p54pci supports not only PCI / Cardbus but also USB
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and SPI. Since p54pci supports all devices prism54 supports
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you will have a conflict. I'm not quite sure how distributions are
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handling this conflict right now. prism54 was kept around due to
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claims users may experience issues when using the SoftMAC driver.
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Time has passed users have not reported issues. If you use prism54
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and for whatever reason you cannot use p54pci please let us know!
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E-mail us at: linux-wireless@vger.kernel.org
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For more information see the p54 wiki page:
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http://wireless.kernel.org/en/users/Drivers/p54
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Who: Luis R. Rodriguez <lrodriguez@atheros.com>
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---------------------------
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What: IRQF_SAMPLE_RANDOM
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Check: IRQF_SAMPLE_RANDOM
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When: July 2009
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Why: Many of IRQF_SAMPLE_RANDOM users are technically bogus as entropy
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sources in the kernel's current entropy model. To resolve this, every
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input point to the kernel's entropy pool needs to better document the
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type of entropy source it actually is. This will be replaced with
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additional add_*_randomness functions in drivers/char/random.c
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Who: Robin Getz <rgetz@blackfin.uclinux.org> & Matt Mackall <mpm@selenic.com>
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---------------------------
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What: The ieee80211_regdom module parameter
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When: March 2010 / desktop catchup
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Why: This was inherited by the CONFIG_WIRELESS_OLD_REGULATORY code,
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and currently serves as an option for users to define an
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ISO / IEC 3166 alpha2 code for the country they are currently
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present in. Although there are userspace API replacements for this
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through nl80211 distributions haven't yet caught up with implementing
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decent alternatives through standard GUIs. Although available as an
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option through iw or wpa_supplicant its just a matter of time before
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distributions pick up good GUI options for this. The ideal solution
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would actually consist of intelligent designs which would do this for
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the user automatically even when travelling through different countries.
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Until then we leave this module parameter as a compromise.
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When userspace improves with reasonable widely-available alternatives for
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this we will no longer need this module parameter. This entry hopes that
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by the super-futuristically looking date of "March 2010" we will have
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such replacements widely available.
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Who: Luis R. Rodriguez <lrodriguez@atheros.com>
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---------------------------
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What: CONFIG_WIRELESS_OLD_REGULATORY - old static regulatory information
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When: March 2010 / desktop catchup
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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 will remove this option once the standard Linux desktop catches
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up with the new userspace APIs we have implemented.
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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 from Video devices.
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When: July 2009
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Files: include/linux/videodev.h
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Check: 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: 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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- 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: GPIO autorequest on gpio_direction_{input,output}() in gpiolib
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When: February 2010
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Why: All callers should use explicit gpio_request()/gpio_free().
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The autorequest mechanism in gpiolib was provided mostly as a
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migration aid for legacy GPIO interfaces (for SOC based GPIOs).
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Those users have now largely migrated. Platforms implementing
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the GPIO interfaces without using gpiolib will see no changes.
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Who: David Brownell <dbrownell@users.sourceforge.net>
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---------------------------
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What: b43 support for firmware revision < 410
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When: The schedule was July 2008, but it was decided that we are going to keep the
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code as long as there are no major maintanance headaches.
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So it _could_ be removed _any_ time now, if it conflicts with something new.
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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: /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: Ability for non root users to shm_get hugetlb pages based on mlock
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resource limits
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When: 2.6.31
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Why: Non root users need to be part of /proc/sys/vm/hugetlb_shm_group or
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have CAP_IPC_LOCK to be able to allocate shm segments backed by
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huge pages. The mlock based rlimit check to allow shm hugetlb is
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inconsistent with mmap based allocations. Hence it is being
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deprecated.
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Who: Ravikiran Thirumalai <kiran@scalex86.org>
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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: sysfs ui for changing p4-clockmod parameters
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When: September 2009
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Why: See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and
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e088e4c9cdb618675874becb91b2fd581ee707e6.
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Removal is subject to fixing any remaining bugs in ACPI which may
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cause the thermal throttling not to happen at the right time.
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Who: Dave Jones <davej@redhat.com>, Matthew Garrett <mjg@redhat.com>
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-----------------------------
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What: __do_IRQ all in one fits nothing interrupt handler
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When: 2.6.32
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Why: __do_IRQ was kept for easy migration to the type flow handlers.
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More than two years of migration time is enough.
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Who: Thomas Gleixner <tglx@linutronix.de>
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-----------------------------
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What: fakephp and associated sysfs files in /sys/bus/pci/slots/
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When: 2011
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Why: In 2.6.27, the semantics of /sys/bus/pci/slots was redefined to
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represent a machine's physical PCI slots. The change in semantics
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had userspace implications, as the hotplug core no longer allowed
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drivers to create multiple sysfs files per physical slot (required
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for multi-function devices, e.g.). fakephp was seen as a developer's
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tool only, and its interface changed. Too late, we learned that
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there were some users of the fakephp interface.
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In 2.6.30, the original fakephp interface was restored. At the same
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time, the PCI core gained the ability that fakephp provided, namely
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function-level hot-remove and hot-add.
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Since the PCI core now provides the same functionality, exposed in:
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/sys/bus/pci/rescan
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/sys/bus/pci/devices/.../remove
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/sys/bus/pci/devices/.../rescan
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there is no functional reason to maintain fakephp as well.
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We will keep the existing module so that 'modprobe fakephp' will
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present the old /sys/bus/pci/slots/... interface for compatibility,
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but users are urged to migrate their applications to the API above.
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After a reasonable transition period, we will remove the legacy
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fakephp interface.
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Who: Alex Chiang <achiang@hp.com>
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---------------------------
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What: CONFIG_RFKILL_INPUT
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When: 2.6.33
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Why: Should be implemented in userspace, policy daemon.
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Who: Johannes Berg <johannes@sipsolutions.net>
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---------------------------
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What: CONFIG_INOTIFY
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When: 2.6.33
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Why: last user (audit) will be converted to the newer more generic
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and more easily maintained fsnotify subsystem
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Who: Eric Paris <eparis@redhat.com>
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----------------------------
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What: lock_policy_rwsem_* and unlock_policy_rwsem_* will not be
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exported interface anymore.
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When: 2.6.33
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Why: cpu_policy_rwsem has a new cleaner definition making it local to
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cpufreq core and contained inside cpufreq.c. Other dependent
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drivers should not use it in order to safely avoid lockdep issues.
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Who: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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----------------------------
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What: sound-slot/service-* module aliases and related clutters in
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sound/sound_core.c
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When: August 2010
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Why: OSS sound_core grabs all legacy minors (0-255) of SOUND_MAJOR
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(14) and requests modules using custom sound-slot/service-*
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module aliases. The only benefit of doing this is allowing
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use of custom module aliases which might as well be considered
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a bug at this point. This preemptive claiming prevents
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alternative OSS implementations.
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Till the feature is removed, the kernel will be requesting
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both sound-slot/service-* and the standard char-major-* module
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aliases and allow turning off the pre-claiming selectively via
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CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss
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kernel parameter.
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After the transition phase is complete, both the custom module
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aliases and switches to disable it will go away. This removal
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will also allow making ALSA OSS emulation independent of
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sound_core. The dependency will be broken then too.
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Who: Tejun Heo <tj@kernel.org>
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----------------------------
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What: Support for VMware's guest paravirtuliazation technique [VMI] will be
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dropped.
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When: 2.6.37 or earlier.
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Why: With the recent innovations in CPU hardware acceleration technologies
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from Intel and AMD, VMware ran a few experiments to compare these
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techniques to guest paravirtualization technique on VMware's platform.
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These hardware assisted virtualization techniques have outperformed the
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performance benefits provided by VMI in most of the workloads. VMware
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expects that these hardware features will be ubiquitous in a couple of
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years, as a result, VMware has started a phased retirement of this
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feature from the hypervisor. We will be removing this feature from the
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Kernel too. Right now we are targeting 2.6.37 but can retire earlier if
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technical reasons (read opportunity to remove major chunk of pvops)
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arise.
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Please note that VMI has always been an optimization and non-VMI kernels
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still work fine on VMware's platform.
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Latest versions of VMware's product which support VMI are,
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Workstation 7.0 and VSphere 4.0 on ESX side, future maintainence
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releases for these products will continue supporting VMI.
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For more details about VMI retirement take a look at this,
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http://blogs.vmware.com/guestosguide/2009/09/vmi-retirement.html
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Who: Alok N Kataria <akataria@vmware.com>
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----------------------------
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What: adt7473 hardware monitoring driver
|
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When: February 2010
|
|
Why: Obsoleted by the adt7475 driver.
|
|
Who: Jean Delvare <khali@linux-fr.org>
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|
|
|
---------------------------
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What: Support for lcd_switch and display_get in asus-laptop driver
|
|
When: March 2010
|
|
Why: These two features use non-standard interfaces. There are the
|
|
only features that really need multiple path to guess what's
|
|
the right method name on a specific laptop.
|
|
|
|
Removing them will allow to remove a lot of code an significantly
|
|
clean the drivers.
|
|
|
|
This will affect the backlight code which won't be able to know
|
|
if the backlight is on or off. The platform display file will also be
|
|
write only (like the one in eeepc-laptop).
|
|
|
|
This should'nt affect a lot of user because they usually know
|
|
when their display is on or off.
|
|
|
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Who: Corentin Chary <corentin.chary@gmail.com>
|
|
|
|
----------------------------
|
|
|
|
What: usbvideo quickcam_messenger driver
|
|
When: 2.6.35
|
|
Files: drivers/media/video/usbvideo/quickcam_messenger.[ch]
|
|
Why: obsolete v4l1 driver replaced by gspca_stv06xx
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: ov511 v4l1 driver
|
|
When: 2.6.35
|
|
Files: drivers/media/video/ov511.[ch]
|
|
Why: obsolete v4l1 driver replaced by gspca_ov519
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: w9968cf v4l1 driver
|
|
When: 2.6.35
|
|
Files: drivers/media/video/w9968cf*.[ch]
|
|
Why: obsolete v4l1 driver replaced by gspca_ov519
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: ovcamchip sensor framework
|
|
When: 2.6.35
|
|
Files: drivers/media/video/ovcamchip/*
|
|
Why: Only used by obsoleted v4l1 drivers
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: stv680 v4l1 driver
|
|
When: 2.6.35
|
|
Files: drivers/media/video/stv680.[ch]
|
|
Why: obsolete v4l1 driver replaced by gspca_stv0680
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|
|
|
|
----------------------------
|
|
|
|
What: zc0301 v4l driver
|
|
When: 2.6.35
|
|
Files: drivers/media/video/zc0301/*
|
|
Why: Duplicate functionality with the gspca_zc3xx driver, zc0301 only
|
|
supports 2 USB-ID's (because it only supports a limited set of
|
|
sensors) wich are also supported by the gspca_zc3xx driver
|
|
(which supports 53 USB-ID's in total)
|
|
Who: Hans de Goede <hdegoede@redhat.com>
|