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 new ioctl-based rawiso interface, which is
35 more efficient. You should really be using libraw1394 for raw1394
37 Who: Jody McIntyre <scjody@modernduck.com>
39 ---------------------------
41 What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
43 Why: V4L1 AP1 was replaced by V4L2 API. during migration from 2.4 to 2.6
44 series. The old API have lots of drawbacks and don't provide enough
45 means to work with all video and audio standards. The newer API is
46 already available on the main drivers and should be used instead.
47 Newer drivers should use v4l_compat_translate_ioctl function to handle
48 old calls, replacing to newer ones.
49 Decoder iocts are using internally to allow video drivers to
50 communicate with video decoders. This should also be improved to allow
51 V4L2 calls being translated into compatible internal ioctls.
52 Who: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
54 ---------------------------
56 What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
58 Files: drivers/pcmcia/: pcmcia_ioctl.c
59 Why: With the 16-bit PCMCIA subsystem now behaving (almost) like a
60 normal hotpluggable bus, and with it using the default kernel
61 infrastructure (hotplug, driver core, sysfs) keeping the PCMCIA
62 control ioctl needed by cardmgr and cardctl from pcmcia-cs is
63 unnecessary, and makes further cleanups and integration of the
64 PCMCIA subsystem into the Linux kernel device driver model more
65 difficult. The features provided by cardmgr and cardctl are either
66 handled by the kernel itself now or are available in the new
67 pcmciautils package available at
68 http://kernel.org/pub/linux/utils/kernel/pcmcia/
69 Who: Dominik Brodowski <linux@brodo.de>
71 ---------------------------
73 What: remove EXPORT_SYMBOL(kernel_thread)
75 Files: arch/*/kernel/*_ksyms.c
76 Why: kernel_thread is a low-level implementation detail. Drivers should
77 use the <linux/kthread.h> API instead which shields them from
78 implementation details and provides a higherlevel interface that
79 prevents bugs and code duplication
80 Who: Christoph Hellwig <hch@lst.de>
82 ---------------------------
84 What: CONFIG_FORCED_INLINING
86 Why: Config option is there to see if gcc is good enough. (in january
87 2006). If it is, the behavior should just be the default. If it's not,
88 the option should just go away entirely.
91 ---------------------------
93 What: eepro100 network driver
95 Why: replaced by the e100 driver
96 Who: Adrian Bunk <bunk@stusta.de>
98 ---------------------------
100 What: drivers depending on OSS_OBSOLETE_DRIVER
101 When: options in 2.6.20, code in 2.6.22
102 Why: OSS drivers with ALSA replacements
103 Who: Adrian Bunk <bunk@stusta.de>
105 ---------------------------
107 What: pci_module_init(driver)
109 Why: Is replaced by pci_register_driver(pci_driver).
110 Who: Richard Knutsson <ricknu-0@student.ltu.se> and Greg Kroah-Hartman <gregkh@suse.de>
112 ---------------------------
114 What: Usage of invalid timevals in setitimer
116 Why: POSIX requires to validate timevals in the setitimer call. This
117 was never done by Linux. The invalid (e.g. negative timevals) were
118 silently converted to more or less random timeouts and intervals.
119 Until the removal a per boot limited number of warnings is printed
120 and the timevals are sanitized.
122 Who: Thomas Gleixner <tglx@linutronix.de>
124 ---------------------------
126 What: I2C interface of the it87 driver
128 Why: The ISA interface is faster and should be always available. The I2C
129 probing is also known to cause trouble in at least one case (see
131 Who: Jean Delvare <khali@linux-fr.org>
133 ---------------------------
135 What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
136 (temporary transition config option provided until then)
137 The transition config option will also be removed at the same time.
139 Why: Unused symbols are both increasing the size of the kernel binary
140 and are often a sign of "wrong API"
141 Who: Arjan van de Ven <arjan@linux.intel.com>
143 ---------------------------
145 What: mount/umount uevents
147 Why: These events are not correct, and do not properly let userspace know
148 when a file system has been mounted or unmounted. Userspace should
149 poll the /proc/mounts file instead to detect this properly.
150 Who: Greg Kroah-Hartman <gregkh@suse.de>
152 ---------------------------
154 What: USB driver API moves to EXPORT_SYMBOL_GPL
156 Files: include/linux/usb.h, drivers/usb/core/driver.c
157 Why: The USB subsystem has changed a lot over time, and it has been
158 possible to create userspace USB drivers using usbfs/libusb/gadgetfs
159 that operate as fast as the USB bus allows. Because of this, the USB
160 subsystem will not be allowing closed source kernel drivers to
161 register with it, after this grace period is over. If anyone needs
162 any help in converting their closed source drivers over to use the
163 userspace filesystems, please contact the
164 linux-usb-devel@lists.sourceforge.net mailing list, and the developers
165 there will be glad to help you out.
166 Who: Greg Kroah-Hartman <gregkh@suse.de>
168 ---------------------------
170 What: find_trylock_page
172 Why: The interface no longer has any callers left in the kernel. It
173 is an odd interface (compared with other find_*_page functions), in
174 that it does not take a refcount to the page, only the page lock.
175 It should be replaced with find_get_page or find_lock_page if possible.
176 This feature removal can be reevaluated if users of the interface
177 cannot cleanly use something else.
178 Who: Nick Piggin <npiggin@suse.de>
180 ---------------------------
182 What: Interrupt only SA_* flags
184 Why: The interrupt related SA_* flags are replaced by IRQF_* to move them
185 out of the signal namespace.
187 Who: Thomas Gleixner <tglx@linutronix.de>
189 ---------------------------
191 What: i2c-ite and i2c-algo-ite drivers
193 Why: These drivers never compiled since they were added to the kernel
194 tree 5 years ago. This feature removal can be reevaluated if
195 someone shows interest in the drivers, fixes them and takes over
197 http://marc.theaimsgroup.com/?l=linux-mips&m=115040510817448
198 Who: Jean Delvare <khali@linux-fr.org>
200 ---------------------------
202 What: Bridge netfilter deferred IPv4/IPv6 output hook calling
204 Why: The deferred output hooks are a layering violation causing unusual
205 and broken behaviour on bridge devices. Examples of things they
206 break include QoS classifation using the MARK or CLASSIFY targets,
207 the IPsec policy match and connection tracking with VLANs on a
208 bridge. Their only use is to enable bridge output port filtering
209 within iptables with the physdev match, which can also be done by
210 combining iptables and ebtables using netfilter marks. Until it
211 will get removed the hook deferral is disabled by default and is
212 only enabled when needed.
214 Who: Patrick McHardy <kaber@trash.net>
216 ---------------------------
218 What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment
220 Why: The stacking of class devices makes these values misleading and
222 Class devices should not carry any of these properties, and bus
223 devices have SUBSYTEM and DRIVER as a replacement.
224 Who: Kay Sievers <kay.sievers@suse.de>
226 ---------------------------
230 Why: i2c-isa is a non-sense and doesn't fit in the device driver
231 model. Drivers relying on it are better implemented as platform
233 Who: Jean Delvare <khali@linux-fr.org>
235 ---------------------------
237 What: IPv4 only connection tracking/NAT/helpers
239 Why: The new layer 3 independant connection tracking replaces the old
240 IPv4 only version. After some stabilization of the new code the
241 old one will be removed.
242 Who: Patrick McHardy <kaber@trash.net>
244 ---------------------------