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![Hans Verkuil](/assets/img/avatar_default.png)
Radio devices have weird side-effects when used with combined TV/radio tuners and the V4L2 spec is ambiguous on how it should work. This results in inconsistent driver behavior which makes life hard for everyone. Be more strict in when and how the switch between radio and tv mode takes place and make sure all drivers behave the same. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
624 lines
23 KiB
Text
624 lines
23 KiB
Text
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: x86 floppy disable_hlt
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When: 2012
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Why: ancient workaround of dubious utility clutters the
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code used by everybody else.
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Who: Len Brown <len.brown@intel.com>
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---------------------------
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What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle
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When: 2012
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Why: This optional sub-feature of APM is of dubious reliability,
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and ancient APM laptops are likely better served by calling HLT.
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Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting
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the pm_idle function pointer to modules.
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Who: Len Brown <len.brown@intel.com>
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----------------------------
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What: x86_32 "no-hlt" cmdline param
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When: 2012
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Why: remove a branch from idle path, simplify code used by everybody.
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This option disabled the use of HLT in idle and machine_halt()
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for hardware that was flakey 15-years ago. Today we have
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"idle=poll" that removed HLT from idle, and so if such a machine
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is still running the upstream kernel, "idle=poll" is likely sufficient.
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Who: Len Brown <len.brown@intel.com>
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----------------------------
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What: x86 "idle=mwait" cmdline param
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When: 2012
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Why: simplify x86 idle code
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Who: Len Brown <len.brown@intel.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: Deprecated snapshot ioctls
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When: 2.6.36
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Why: The ioctls in kernel/power/user.c were marked as deprecated long time
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ago. Now they notify users about that so that they need to replace
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their userspace. After some more time, remove them completely.
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Who: Jiri Slaby <jirislaby@gmail.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: 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@ucw.cz>
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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: /proc/<pid>/oom_adj
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When: August 2012
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Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's
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badness heuristic used to determine which task to kill when the kernel
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is out of memory.
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The badness heuristic has since been rewritten since the introduction of
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this tunable such that its meaning is deprecated. The value was
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implemented as a bitshift on a score generated by the badness()
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function that did not have any precise units of measure. With the
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rewrite, the score is given as a proportion of available memory to the
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task allocating pages, so using a bitshift which grows the score
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exponentially is, thus, impossible to tune with fine granularity.
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A much more powerful interface, /proc/<pid>/oom_score_adj, was
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introduced with the oom killer rewrite that allows users to increase or
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decrease the badness() score linearly. This interface will replace
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/proc/<pid>/oom_adj.
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A warning will be emitted to the kernel log if an application uses this
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deprecated interface. After it is printed once, future warnings will be
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suppressed until the kernel is rebooted.
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---------------------------
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What: CS5535/CS5536 obsolete GPIO driver
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When: June 2011
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Files: drivers/staging/cs5535_gpio/*
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Check: drivers/staging/cs5535_gpio/cs5535_gpio.c
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Why: A newer driver replaces this; it is drivers/gpio/cs5535-gpio.c, and
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integrates with the Linux GPIO subsystem. The old driver has been
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moved to staging, and will be removed altogether around 2.6.40.
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Please test the new driver, and ensure that the functionality you
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need and any bugfixes from the old driver are available in the new
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one.
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Who: Andres Salomon <dilinger@queued.net>
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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: CONFIG_ACPI_PROCFS_POWER
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When: 2.6.39
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Why: sysfs I/F for ACPI power devices, including AC and Battery,
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has been working in upstream kernel since 2.6.24, Sep 2007.
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In 2.6.37, we make the sysfs I/F always built in and this option
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disabled by default.
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Remove this option and the ACPI power procfs interface in 2.6.39.
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Who: Zhang Rui <rui.zhang@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: 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: 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: 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: 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: 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: sysfs-class-rfkill state file
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When: Feb 2014
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Files: net/rfkill/core.c
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Why: Documented as obsolete since Feb 2010. This file is limited to 3
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states while the rfkill drivers can have 4 states.
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Who: anybody or Florian Mickler <florian@mickler.org>
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----------------------------
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What: sysfs-class-rfkill claim file
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When: Feb 2012
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Files: net/rfkill/core.c
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Why: It is not possible to claim an rfkill driver since 2007. This is
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Documented as obsolete since Feb 2010.
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Who: anybody or Florian Mickler <florian@mickler.org>
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----------------------------
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What: KVM paravirt mmu host support
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When: January 2011
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Why: The paravirt mmu host support is slower than non-paravirt mmu, both
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on newer and older hardware. It is already not exposed to the guest,
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and kept only for live migration purposes.
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Who: Avi Kivity <avi@redhat.com>
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----------------------------
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What: iwlwifi 50XX module parameters
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When: 2.6.40
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Why: The "..50" modules parameters were used to configure 5000 series and
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up devices; different set of module parameters also available for 4965
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with same functionalities. Consolidate both set into single place
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in drivers/net/wireless/iwlwifi/iwl-agn.c
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Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
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----------------------------
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What: iwl4965 alias support
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When: 2.6.40
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Why: Internal alias support has been present in module-init-tools for some
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time, the MODULE_ALIAS("iwl4965") boilerplate aliases can be removed
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with no impact.
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Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
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---------------------------
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What: xt_NOTRACK
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Files: net/netfilter/xt_NOTRACK.c
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When: April 2011
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Why: Superseded by xt_CT
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Who: Netfilter developer team <netfilter-devel@vger.kernel.org>
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----------------------------
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What: IRQF_DISABLED
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When: 2.6.36
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Why: The flag is a NOOP as we run interrupt handlers with interrupts disabled
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Who: Thomas Gleixner <tglx@linutronix.de>
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|
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----------------------------
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What: PCI DMA unmap state API
|
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When: August 2012
|
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Why: PCI DMA unmap state API (include/linux/pci-dma.h) was replaced
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with DMA unmap state API (DMA unmap state API can be used for
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any bus).
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Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
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|
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----------------------------
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What: DMA_xxBIT_MASK macros
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When: Jun 2011
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Why: DMA_xxBIT_MASK macros were replaced with DMA_BIT_MASK() macros.
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Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
|
|
|
|
----------------------------
|
|
|
|
What: namespace cgroup (ns_cgroup)
|
|
When: 2.6.38
|
|
Why: The ns_cgroup leads to some problems:
|
|
* cgroup creation is out-of-control
|
|
* cgroup name can conflict when pids are looping
|
|
* it is not possible to have a single process handling
|
|
a lot of namespaces without falling in a exponential creation time
|
|
* we may want to create a namespace without creating a cgroup
|
|
|
|
The ns_cgroup is replaced by a compatibility flag 'clone_children',
|
|
where a newly created cgroup will copy the parent cgroup values.
|
|
The userspace has to manually create a cgroup and add a task to
|
|
the 'tasks' file.
|
|
Who: Daniel Lezcano <daniel.lezcano@free.fr>
|
|
|
|
----------------------------
|
|
|
|
What: iwlwifi disable_hw_scan module parameters
|
|
When: 2.6.40
|
|
Why: Hareware scan is the prefer method for iwlwifi devices for
|
|
scanning operation. Remove software scan support for all the
|
|
iwlwifi devices.
|
|
|
|
Who: Wey-Yi Guy <wey-yi.w.guy@intel.com>
|
|
|
|
----------------------------
|
|
|
|
What: access to nfsd auth cache through sys_nfsservctl or '.' files
|
|
in the 'nfsd' filesystem.
|
|
When: 2.6.40
|
|
Why: This is a legacy interface which have been replaced by a more
|
|
dynamic cache. Continuing to maintain this interface is an
|
|
unnecessary burden.
|
|
Who: NeilBrown <neilb@suse.de>
|
|
|
|
----------------------------
|
|
|
|
What: cancel_rearming_delayed_work[queue]()
|
|
When: 2.6.39
|
|
|
|
Why: The functions have been superceded by cancel_delayed_work_sync()
|
|
quite some time ago. The conversion is trivial and there is no
|
|
in-kernel user left.
|
|
Who: Tejun Heo <tj@kernel.org>
|
|
|
|
----------------------------
|
|
|
|
What: Legacy, non-standard chassis intrusion detection interface.
|
|
When: June 2011
|
|
Why: The adm9240, w83792d and w83793 hardware monitoring drivers have
|
|
legacy interfaces for chassis intrusion detection. A standard
|
|
interface has been added to each driver, so the legacy interface
|
|
can be removed.
|
|
Who: Jean Delvare <khali@linux-fr.org>
|
|
|
|
----------------------------
|
|
|
|
What: xt_connlimit rev 0
|
|
When: 2012
|
|
Who: Jan Engelhardt <jengelh@medozas.de>
|
|
Files: net/netfilter/xt_connlimit.c
|
|
|
|
----------------------------
|
|
|
|
What: noswapaccount kernel command line parameter
|
|
When: 2.6.40
|
|
Why: The original implementation of memsw feature enabled by
|
|
CONFIG_CGROUP_MEM_RES_CTLR_SWAP could be disabled by the noswapaccount
|
|
kernel parameter (introduced in 2.6.29-rc1). Later on, this decision
|
|
turned out to be not ideal because we cannot have the feature compiled
|
|
in and disabled by default and let only interested to enable it
|
|
(e.g. general distribution kernels might need it). Therefore we have
|
|
added swapaccount[=0|1] parameter (introduced in 2.6.37) which provides
|
|
the both possibilities. If we remove noswapaccount we will have
|
|
less command line parameters with the same functionality and we
|
|
can also cleanup the parameter handling a bit ().
|
|
Who: Michal Hocko <mhocko@suse.cz>
|
|
|
|
----------------------------
|
|
|
|
What: ipt_addrtype match include file
|
|
When: 2012
|
|
Why: superseded by xt_addrtype
|
|
Who: Florian Westphal <fw@strlen.de>
|
|
Files: include/linux/netfilter_ipv4/ipt_addrtype.h
|
|
|
|
----------------------------
|
|
|
|
What: i2c_driver.attach_adapter
|
|
i2c_driver.detach_adapter
|
|
When: September 2011
|
|
Why: These legacy callbacks should no longer be used as i2c-core offers
|
|
a variety of preferable alternative ways to instantiate I2C devices.
|
|
Who: Jean Delvare <khali@linux-fr.org>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_ADD in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: The information passed to the driver by this ioctl is now queried
|
|
dynamically from the device.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_MAP_OLD in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: Used only by applications compiled against older driver versions.
|
|
Superseded by UVCIOC_CTRL_MAP which supports V4L2 menu controls.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: Support for UVCIOC_CTRL_GET and UVCIOC_CTRL_SET in the uvcvideo driver
|
|
When: 2.6.42
|
|
Why: Superseded by the UVCIOC_CTRL_QUERY ioctl.
|
|
Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
|
|
----------------------------
|
|
|
|
What: For VIDIOC_S_FREQUENCY the type field must match the device node's type.
|
|
If not, return -EINVAL.
|
|
When: 3.2
|
|
Why: It makes no sense to switch the tuner to radio mode by calling
|
|
VIDIOC_S_FREQUENCY on a video node, or to switch the tuner to tv mode by
|
|
calling VIDIOC_S_FREQUENCY on a radio node. This is the first step of a
|
|
move to more consistent handling of tv and radio tuners.
|
|
Who: Hans Verkuil <hans.verkuil@cisco.com>
|
|
|
|
----------------------------
|
|
|
|
What: Opening a radio device node will no longer automatically switch the
|
|
tuner mode from tv to radio.
|
|
When: 3.3
|
|
Why: Just opening a V4L device should not change the state of the hardware
|
|
like that. It's very unexpected and against the V4L spec. Instead, you
|
|
switch to radio mode by calling VIDIOC_S_FREQUENCY. This is the second
|
|
and last step of the move to consistent handling of tv and radio tuners.
|
|
Who: Hans Verkuil <hans.verkuil@cisco.com>
|
|
|
|
----------------------------
|