1 The following is a list of files and features that are going to be
2 removed in the kernel source tree. Every entry should contain what
3 exactly is going away, why it is happening, and who is going to be doing
4 the work. When the feature is removed from the kernel, it should also
5 be removed from this file.
7 ---------------------------
9 What: /sys/devices/.../power/state
10 dev->power.power_state
11 dpm_runtime_{suspend,resume)()
13 Why: Broken design for runtime control over driver power states, confusing
14 driver-internal runtime power management with: mechanisms to support
15 system-wide sleep state transitions; event codes that distinguish
16 different phases of swsusp "sleep" transitions; and userspace policy
17 inputs. This framework was never widely used, and most attempts to
18 use it were broken. Drivers should instead be exposing domain-specific
19 interfaces either to kernel or to userspace.
20 Who: Pavel Machek <pavel@suse.cz>
22 ---------------------------
24 What: RAW driver (CONFIG_RAW_DRIVER)
26 Why: declared obsolete since kernel 2.6.3
27 O_DIRECT can be used instead
28 Who: Adrian Bunk <bunk@stusta.de>
30 ---------------------------
32 What: raw1394: requests of type RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN
34 Why: Deprecated in favour of the more efficient and robust rawiso interface.
35 Affected are applications which use the deprecated part of libraw1394
36 (raw1394_iso_write, raw1394_start_iso_write, raw1394_start_iso_rcv,
37 raw1394_stop_iso_rcv) or bypass libraw1394.
38 Who: Dan Dennedy <dan@dennedy.org>, Stefan Richter <stefanr@s5r6.in-berlin.de>
40 ---------------------------
42 What: dv1394 driver (CONFIG_IEEE1394_DV1394)
44 Why: Replaced by raw1394 + userspace libraries, notably libiec61883. This
45 shift of application support has been indicated on www.linux1394.org
46 and developers' mailinglists for quite some time. Major applications
47 have been converted, with the exception of ffmpeg and hence xine.
48 Piped output of dvgrab2 is a partial equivalent to dv1394.
49 Who: Dan Dennedy <dan@dennedy.org>, Stefan Richter <stefanr@s5r6.in-berlin.de>
51 ---------------------------
53 What: ieee1394 core's unused exports (CONFIG_IEEE1394_EXPORT_FULL_API)
55 Why: There are no projects known to use these exported symbols, except
56 dfg1394 (uses one symbol whose functionality is core-internal now).
57 Who: Stefan Richter <stefanr@s5r6.in-berlin.de>
59 ---------------------------
61 What: ieee1394's *_oui sysfs attributes (CONFIG_IEEE1394_OUI_DB)
63 Files: drivers/ieee1394/: oui.db, oui2c.sh
64 Why: big size, little value
65 Who: Stefan Richter <stefanr@s5r6.in-berlin.de>
67 ---------------------------
69 What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
71 Why: V4L1 AP1 was replaced by V4L2 API. during migration from 2.4 to 2.6
72 series. The old API have lots of drawbacks and don't provide enough
73 means to work with all video and audio standards. The newer API is
74 already available on the main drivers and should be used instead.
75 Newer drivers should use v4l_compat_translate_ioctl function to handle
76 old calls, replacing to newer ones.
77 Decoder iocts are using internally to allow video drivers to
78 communicate with video decoders. This should also be improved to allow
79 V4L2 calls being translated into compatible internal ioctls.
80 Who: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
82 ---------------------------
84 What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
86 Files: drivers/pcmcia/: pcmcia_ioctl.c
87 Why: With the 16-bit PCMCIA subsystem now behaving (almost) like a
88 normal hotpluggable bus, and with it using the default kernel
89 infrastructure (hotplug, driver core, sysfs) keeping the PCMCIA
90 control ioctl needed by cardmgr and cardctl from pcmcia-cs is
91 unnecessary, and makes further cleanups and integration of the
92 PCMCIA subsystem into the Linux kernel device driver model more
93 difficult. The features provided by cardmgr and cardctl are either
94 handled by the kernel itself now or are available in the new
95 pcmciautils package available at
96 http://kernel.org/pub/linux/utils/kernel/pcmcia/
97 Who: Dominik Brodowski <linux@brodo.de>
99 ---------------------------
101 What: remove EXPORT_SYMBOL(kernel_thread)
103 Files: arch/*/kernel/*_ksyms.c
104 Why: kernel_thread is a low-level implementation detail. Drivers should
105 use the <linux/kthread.h> API instead which shields them from
106 implementation details and provides a higherlevel interface that
107 prevents bugs and code duplication
108 Who: Christoph Hellwig <hch@lst.de>
110 ---------------------------
112 What: CONFIG_FORCED_INLINING
114 Why: Config option is there to see if gcc is good enough. (in january
115 2006). If it is, the behavior should just be the default. If it's not,
116 the option should just go away entirely.
117 Who: Arjan van de Ven
119 ---------------------------
121 What: eepro100 network driver
123 Why: replaced by the e100 driver
124 Who: Adrian Bunk <bunk@stusta.de>
126 ---------------------------
128 What: drivers depending on OSS_OBSOLETE_DRIVER
129 When: options in 2.6.20, code in 2.6.22
130 Why: OSS drivers with ALSA replacements
131 Who: Adrian Bunk <bunk@stusta.de>
133 ---------------------------
135 What: pci_module_init(driver)
137 Why: Is replaced by pci_register_driver(pci_driver).
138 Who: Richard Knutsson <ricknu-0@student.ltu.se> and Greg Kroah-Hartman <gregkh@suse.de>
140 ---------------------------
142 What: Usage of invalid timevals in setitimer
144 Why: POSIX requires to validate timevals in the setitimer call. This
145 was never done by Linux. The invalid (e.g. negative timevals) were
146 silently converted to more or less random timeouts and intervals.
147 Until the removal a per boot limited number of warnings is printed
148 and the timevals are sanitized.
150 Who: Thomas Gleixner <tglx@linutronix.de>
152 ---------------------------
154 What: I2C interface of the it87 driver
156 Why: The ISA interface is faster and should be always available. The I2C
157 probing is also known to cause trouble in at least one case (see
159 Who: Jean Delvare <khali@linux-fr.org>
161 ---------------------------
163 What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
164 (temporary transition config option provided until then)
165 The transition config option will also be removed at the same time.
167 Why: Unused symbols are both increasing the size of the kernel binary
168 and are often a sign of "wrong API"
169 Who: Arjan van de Ven <arjan@linux.intel.com>
171 ---------------------------
173 What: mount/umount uevents
175 Why: These events are not correct, and do not properly let userspace know
176 when a file system has been mounted or unmounted. Userspace should
177 poll the /proc/mounts file instead to detect this properly.
178 Who: Greg Kroah-Hartman <gregkh@suse.de>
180 ---------------------------
182 What: USB driver API moves to EXPORT_SYMBOL_GPL
184 Files: include/linux/usb.h, drivers/usb/core/driver.c
185 Why: The USB subsystem has changed a lot over time, and it has been
186 possible to create userspace USB drivers using usbfs/libusb/gadgetfs
187 that operate as fast as the USB bus allows. Because of this, the USB
188 subsystem will not be allowing closed source kernel drivers to
189 register with it, after this grace period is over. If anyone needs
190 any help in converting their closed source drivers over to use the
191 userspace filesystems, please contact the
192 linux-usb-devel@lists.sourceforge.net mailing list, and the developers
193 there will be glad to help you out.
194 Who: Greg Kroah-Hartman <gregkh@suse.de>
196 ---------------------------
198 What: find_trylock_page
200 Why: The interface no longer has any callers left in the kernel. It
201 is an odd interface (compared with other find_*_page functions), in
202 that it does not take a refcount to the page, only the page lock.
203 It should be replaced with find_get_page or find_lock_page if possible.
204 This feature removal can be reevaluated if users of the interface
205 cannot cleanly use something else.
206 Who: Nick Piggin <npiggin@suse.de>
208 ---------------------------
210 What: Interrupt only SA_* flags
212 Why: The interrupt related SA_* flags are replaced by IRQF_* to move them
213 out of the signal namespace.
215 Who: Thomas Gleixner <tglx@linutronix.de>
217 ---------------------------
219 What: i2c-ite and i2c-algo-ite drivers
221 Why: These drivers never compiled since they were added to the kernel
222 tree 5 years ago. This feature removal can be reevaluated if
223 someone shows interest in the drivers, fixes them and takes over
225 http://marc.theaimsgroup.com/?l=linux-mips&m=115040510817448
226 Who: Jean Delvare <khali@linux-fr.org>
228 ---------------------------
230 What: Bridge netfilter deferred IPv4/IPv6 output hook calling
232 Why: The deferred output hooks are a layering violation causing unusual
233 and broken behaviour on bridge devices. Examples of things they
234 break include QoS classifation using the MARK or CLASSIFY targets,
235 the IPsec policy match and connection tracking with VLANs on a
236 bridge. Their only use is to enable bridge output port filtering
237 within iptables with the physdev match, which can also be done by
238 combining iptables and ebtables using netfilter marks. Until it
239 will get removed the hook deferral is disabled by default and is
240 only enabled when needed.
242 Who: Patrick McHardy <kaber@trash.net>
244 ---------------------------
246 What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
248 Why: The stacking of class devices makes these values misleading and
250 Class devices should not carry any of these properties, and bus
251 devices have SUBSYTEM and DRIVER as a replacement.
252 Who: Kay Sievers <kay.sievers@suse.de>
254 ---------------------------
258 Why: i2c-isa is a non-sense and doesn't fit in the device driver
259 model. Drivers relying on it are better implemented as platform
261 Who: Jean Delvare <khali@linux-fr.org>
263 ---------------------------
265 What: IPv4 only connection tracking/NAT/helpers
267 Why: The new layer 3 independant connection tracking replaces the old
268 IPv4 only version. After some stabilization of the new code the
269 old one will be removed.
270 Who: Patrick McHardy <kaber@trash.net>
272 ---------------------------