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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. The suggested deprecation period is 3 releases. | ||
6 | |||
7 | --------------------------- | ||
8 | |||
9 | What: ddebug_query="query" boot cmdline param | ||
10 | When: v3.8 | ||
11 | Why: obsoleted by dyndbg="query" and module.dyndbg="query" | ||
12 | Who: Jim Cromie <jim.cromie@gmail.com>, Jason Baron <jbaron@redhat.com> | ||
13 | |||
14 | --------------------------- | ||
15 | |||
16 | What: /proc/sys/vm/nr_pdflush_threads | ||
17 | When: 2012 | ||
18 | Why: Since pdflush is deprecated, the interface exported in /proc/sys/vm/ | ||
19 | should be removed. | ||
20 | Who: Wanpeng Li <liwp@linux.vnet.ibm.com> | ||
21 | |||
22 | --------------------------- | ||
23 | |||
24 | What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle | ||
25 | When: 2012 | ||
26 | Why: This optional sub-feature of APM is of dubious reliability, | ||
27 | and ancient APM laptops are likely better served by calling HLT. | ||
28 | Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting | ||
29 | the pm_idle function pointer to modules. | ||
30 | Who: Len Brown <len.brown@intel.com> | ||
31 | |||
32 | ---------------------------- | ||
33 | |||
34 | What: x86_32 "no-hlt" cmdline param | ||
35 | When: 2012 | ||
36 | Why: remove a branch from idle path, simplify code used by everybody. | ||
37 | This option disabled the use of HLT in idle and machine_halt() | ||
38 | for hardware that was flakey 15-years ago. Today we have | ||
39 | "idle=poll" that removed HLT from idle, and so if such a machine | ||
40 | is still running the upstream kernel, "idle=poll" is likely sufficient. | ||
41 | Who: Len Brown <len.brown@intel.com> | ||
42 | |||
43 | ---------------------------- | ||
44 | |||
45 | What: x86 "idle=mwait" cmdline param | ||
46 | When: 2012 | ||
47 | Why: simplify x86 idle code | ||
48 | Who: Len Brown <len.brown@intel.com> | ||
49 | |||
50 | ---------------------------- | ||
51 | |||
52 | What: PRISM54 | ||
53 | When: 2.6.34 | ||
54 | |||
55 | Why: prism54 FullMAC PCI / Cardbus devices used to be supported only by the | ||
56 | prism54 wireless driver. After Intersil stopped selling these | ||
57 | devices in preference for the newer more flexible SoftMAC devices | ||
58 | a SoftMAC device driver was required and prism54 did not support | ||
59 | them. The p54pci driver now exists and has been present in the kernel for | ||
60 | a while. This driver supports both SoftMAC devices and FullMAC devices. | ||
61 | The main difference between these devices was the amount of memory which | ||
62 | could be used for the firmware. The SoftMAC devices support a smaller | ||
63 | amount of memory. Because of this the SoftMAC firmware fits into FullMAC | ||
64 | devices's memory. p54pci supports not only PCI / Cardbus but also USB | ||
65 | and SPI. Since p54pci supports all devices prism54 supports | ||
66 | you will have a conflict. I'm not quite sure how distributions are | ||
67 | handling this conflict right now. prism54 was kept around due to | ||
68 | claims users may experience issues when using the SoftMAC driver. | ||
69 | Time has passed users have not reported issues. If you use prism54 | ||
70 | and for whatever reason you cannot use p54pci please let us know! | ||
71 | E-mail us at: linux-wireless@vger.kernel.org | ||
72 | |||
73 | For more information see the p54 wiki page: | ||
74 | |||
75 | http://wireless.kernel.org/en/users/Drivers/p54 | ||
76 | |||
77 | Who: Luis R. Rodriguez <lrodriguez@atheros.com> | ||
78 | |||
79 | --------------------------- | ||
80 | |||
81 | What: The ieee80211_regdom module parameter | ||
82 | When: March 2010 / desktop catchup | ||
83 | |||
84 | Why: This was inherited by the CONFIG_WIRELESS_OLD_REGULATORY code, | ||
85 | and currently serves as an option for users to define an | ||
86 | ISO / IEC 3166 alpha2 code for the country they are currently | ||
87 | present in. Although there are userspace API replacements for this | ||
88 | through nl80211 distributions haven't yet caught up with implementing | ||
89 | decent alternatives through standard GUIs. Although available as an | ||
90 | option through iw or wpa_supplicant its just a matter of time before | ||
91 | distributions pick up good GUI options for this. The ideal solution | ||
92 | would actually consist of intelligent designs which would do this for | ||
93 | the user automatically even when travelling through different countries. | ||
94 | Until then we leave this module parameter as a compromise. | ||
95 | |||
96 | When userspace improves with reasonable widely-available alternatives for | ||
97 | this we will no longer need this module parameter. This entry hopes that | ||
98 | by the super-futuristically looking date of "March 2010" we will have | ||
99 | such replacements widely available. | ||
100 | |||
101 | Who: Luis R. Rodriguez <lrodriguez@atheros.com> | ||
102 | |||
103 | --------------------------- | ||
104 | |||
105 | What: dev->power.power_state | ||
106 | When: July 2007 | ||
107 | Why: Broken design for runtime control over driver power states, confusing | ||
108 | driver-internal runtime power management with: mechanisms to support | ||
109 | system-wide sleep state transitions; event codes that distinguish | ||
110 | different phases of swsusp "sleep" transitions; and userspace policy | ||
111 | inputs. This framework was never widely used, and most attempts to | ||
112 | use it were broken. Drivers should instead be exposing domain-specific | ||
113 | interfaces either to kernel or to userspace. | ||
114 | Who: Pavel Machek <pavel@ucw.cz> | ||
115 | |||
116 | --------------------------- | ||
117 | |||
118 | What: /proc/<pid>/oom_adj | ||
119 | When: August 2012 | ||
120 | Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's | ||
121 | badness heuristic used to determine which task to kill when the kernel | ||
122 | is out of memory. | ||
123 | |||
124 | The badness heuristic has since been rewritten since the introduction of | ||
125 | this tunable such that its meaning is deprecated. The value was | ||
126 | implemented as a bitshift on a score generated by the badness() | ||
127 | function that did not have any precise units of measure. With the | ||
128 | rewrite, the score is given as a proportion of available memory to the | ||
129 | task allocating pages, so using a bitshift which grows the score | ||
130 | exponentially is, thus, impossible to tune with fine granularity. | ||
131 | |||
132 | A much more powerful interface, /proc/<pid>/oom_score_adj, was | ||
133 | introduced with the oom killer rewrite that allows users to increase or | ||
134 | decrease the badness score linearly. This interface will replace | ||
135 | /proc/<pid>/oom_adj. | ||
136 | |||
137 | A warning will be emitted to the kernel log if an application uses this | ||
138 | deprecated interface. After it is printed once, future warnings will be | ||
139 | suppressed until the kernel is rebooted. | ||
140 | |||
141 | --------------------------- | ||
142 | |||
143 | What: remove EXPORT_SYMBOL(kernel_thread) | ||
144 | When: August 2006 | ||
145 | Files: arch/*/kernel/*_ksyms.c | ||
146 | Check: kernel_thread | ||
147 | Why: kernel_thread is a low-level implementation detail. Drivers should | ||
148 | use the <linux/kthread.h> API instead which shields them from | ||
149 | implementation details and provides a higherlevel interface that | ||
150 | prevents bugs and code duplication | ||
151 | Who: Christoph Hellwig <hch@lst.de> | ||
152 | |||
153 | --------------------------- | ||
154 | |||
155 | What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports | ||
156 | (temporary transition config option provided until then) | ||
157 | The transition config option will also be removed at the same time. | ||
158 | When: before 2.6.19 | ||
159 | Why: Unused symbols are both increasing the size of the kernel binary | ||
160 | and are often a sign of "wrong API" | ||
161 | Who: Arjan van de Ven <arjan@linux.intel.com> | ||
162 | |||
163 | --------------------------- | ||
164 | |||
165 | What: PHYSDEVPATH, PHYSDEVBUS, PHYSDEVDRIVER in the uevent environment | ||
166 | When: October 2008 | ||
167 | Why: The stacking of class devices makes these values misleading and | ||
168 | inconsistent. | ||
169 | Class devices should not carry any of these properties, and bus | ||
170 | devices have SUBSYTEM and DRIVER as a replacement. | ||
171 | Who: Kay Sievers <kay.sievers@suse.de> | ||
172 | |||
173 | --------------------------- | ||
174 | |||
175 | What: ACPI procfs interface | ||
176 | When: July 2008 | ||
177 | Why: ACPI sysfs conversion should be finished by January 2008. | ||
178 | ACPI procfs interface will be removed in July 2008 so that | ||
179 | there is enough time for the user space to catch up. | ||
180 | Who: Zhang Rui <rui.zhang@intel.com> | ||
181 | |||
182 | --------------------------- | ||
183 | |||
184 | What: CONFIG_ACPI_PROCFS_POWER | ||
185 | When: 2.6.39 | ||
186 | Why: sysfs I/F for ACPI power devices, including AC and Battery, | ||
187 | has been working in upstream kernel since 2.6.24, Sep 2007. | ||
188 | In 2.6.37, we make the sysfs I/F always built in and this option | ||
189 | disabled by default. | ||
190 | Remove this option and the ACPI power procfs interface in 2.6.39. | ||
191 | Who: Zhang Rui <rui.zhang@intel.com> | ||
192 | |||
193 | --------------------------- | ||
194 | |||
195 | What: /proc/acpi/event | ||
196 | When: February 2008 | ||
197 | Why: /proc/acpi/event has been replaced by events via the input layer | ||
198 | and netlink since 2.6.23. | ||
199 | Who: Len Brown <len.brown@intel.com> | ||
200 | |||
201 | --------------------------- | ||
202 | |||
203 | What: i386/x86_64 bzImage symlinks | ||
204 | When: April 2010 | ||
205 | |||
206 | Why: The i386/x86_64 merge provides a symlink to the old bzImage | ||
207 | location so not yet updated user space tools, e.g. package | ||
208 | scripts, do not break. | ||
209 | Who: Thomas Gleixner <tglx@linutronix.de> | ||
210 | |||
211 | --------------------------- | ||
212 | |||
213 | What: GPIO autorequest on gpio_direction_{input,output}() in gpiolib | ||
214 | When: February 2010 | ||
215 | Why: All callers should use explicit gpio_request()/gpio_free(). | ||
216 | The autorequest mechanism in gpiolib was provided mostly as a | ||
217 | migration aid for legacy GPIO interfaces (for SOC based GPIOs). | ||
218 | Those users have now largely migrated. Platforms implementing | ||
219 | the GPIO interfaces without using gpiolib will see no changes. | ||
220 | Who: David Brownell <dbrownell@users.sourceforge.net> | ||
221 | --------------------------- | ||
222 | |||
223 | What: b43 support for firmware revision < 410 | ||
224 | When: The schedule was July 2008, but it was decided that we are going to keep the | ||
225 | code as long as there are no major maintanance headaches. | ||
226 | So it _could_ be removed _any_ time now, if it conflicts with something new. | ||
227 | Why: The support code for the old firmware hurts code readability/maintainability | ||
228 | and slightly hurts runtime performance. Bugfixes for the old firmware | ||
229 | are not provided by Broadcom anymore. | ||
230 | Who: Michael Buesch <m@bues.ch> | ||
231 | |||
232 | --------------------------- | ||
233 | |||
234 | What: Ability for non root users to shm_get hugetlb pages based on mlock | ||
235 | resource limits | ||
236 | When: 2.6.31 | ||
237 | Why: Non root users need to be part of /proc/sys/vm/hugetlb_shm_group or | ||
238 | have CAP_IPC_LOCK to be able to allocate shm segments backed by | ||
239 | huge pages. The mlock based rlimit check to allow shm hugetlb is | ||
240 | inconsistent with mmap based allocations. Hence it is being | ||
241 | deprecated. | ||
242 | Who: Ravikiran Thirumalai <kiran@scalex86.org> | ||
243 | |||
244 | --------------------------- | ||
245 | |||
246 | What: sysfs ui for changing p4-clockmod parameters | ||
247 | When: September 2009 | ||
248 | Why: See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and | ||
249 | e088e4c9cdb618675874becb91b2fd581ee707e6. | ||
250 | Removal is subject to fixing any remaining bugs in ACPI which may | ||
251 | cause the thermal throttling not to happen at the right time. | ||
252 | Who: Dave Jones <davej@redhat.com>, Matthew Garrett <mjg@redhat.com> | ||
253 | |||
254 | ----------------------------- | ||
255 | |||
256 | What: fakephp and associated sysfs files in /sys/bus/pci/slots/ | ||
257 | When: 2011 | ||
258 | Why: In 2.6.27, the semantics of /sys/bus/pci/slots was redefined to | ||
259 | represent a machine's physical PCI slots. The change in semantics | ||
260 | had userspace implications, as the hotplug core no longer allowed | ||
261 | drivers to create multiple sysfs files per physical slot (required | ||
262 | for multi-function devices, e.g.). fakephp was seen as a developer's | ||
263 | tool only, and its interface changed. Too late, we learned that | ||
264 | there were some users of the fakephp interface. | ||
265 | |||
266 | In 2.6.30, the original fakephp interface was restored. At the same | ||
267 | time, the PCI core gained the ability that fakephp provided, namely | ||
268 | function-level hot-remove and hot-add. | ||
269 | |||
270 | Since the PCI core now provides the same functionality, exposed in: | ||
271 | |||
272 | /sys/bus/pci/rescan | ||
273 | /sys/bus/pci/devices/.../remove | ||
274 | /sys/bus/pci/devices/.../rescan | ||
275 | |||
276 | there is no functional reason to maintain fakephp as well. | ||
277 | |||
278 | We will keep the existing module so that 'modprobe fakephp' will | ||
279 | present the old /sys/bus/pci/slots/... interface for compatibility, | ||
280 | but users are urged to migrate their applications to the API above. | ||
281 | |||
282 | After a reasonable transition period, we will remove the legacy | ||
283 | fakephp interface. | ||
284 | Who: Alex Chiang <achiang@hp.com> | ||
285 | |||
286 | --------------------------- | ||
287 | |||
288 | What: CONFIG_RFKILL_INPUT | ||
289 | When: 2.6.33 | ||
290 | Why: Should be implemented in userspace, policy daemon. | ||
291 | Who: Johannes Berg <johannes@sipsolutions.net> | ||
292 | |||
293 | ---------------------------- | ||
294 | |||
295 | What: sound-slot/service-* module aliases and related clutters in | ||
296 | sound/sound_core.c | ||
297 | When: August 2010 | ||
298 | Why: OSS sound_core grabs all legacy minors (0-255) of SOUND_MAJOR | ||
299 | (14) and requests modules using custom sound-slot/service-* | ||
300 | module aliases. The only benefit of doing this is allowing | ||
301 | use of custom module aliases which might as well be considered | ||
302 | a bug at this point. This preemptive claiming prevents | ||
303 | alternative OSS implementations. | ||
304 | |||
305 | Till the feature is removed, the kernel will be requesting | ||
306 | both sound-slot/service-* and the standard char-major-* module | ||
307 | aliases and allow turning off the pre-claiming selectively via | ||
308 | CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss | ||
309 | kernel parameter. | ||
310 | |||
311 | After the transition phase is complete, both the custom module | ||
312 | aliases and switches to disable it will go away. This removal | ||
313 | will also allow making ALSA OSS emulation independent of | ||
314 | sound_core. The dependency will be broken then too. | ||
315 | Who: Tejun Heo <tj@kernel.org> | ||
316 | |||
317 | ---------------------------- | ||
318 | |||
319 | What: sysfs-class-rfkill state file | ||
320 | When: Feb 2014 | ||
321 | Files: net/rfkill/core.c | ||
322 | Why: Documented as obsolete since Feb 2010. This file is limited to 3 | ||
323 | states while the rfkill drivers can have 4 states. | ||
324 | Who: anybody or Florian Mickler <florian@mickler.org> | ||
325 | |||
326 | ---------------------------- | ||
327 | |||
328 | What: sysfs-class-rfkill claim file | ||
329 | When: Feb 2012 | ||
330 | Files: net/rfkill/core.c | ||
331 | Why: It is not possible to claim an rfkill driver since 2007. This is | ||
332 | Documented as obsolete since Feb 2010. | ||
333 | Who: anybody or Florian Mickler <florian@mickler.org> | ||
334 | |||
335 | ---------------------------- | ||
336 | |||
337 | What: iwlwifi 50XX module parameters | ||
338 | When: 3.0 | ||
339 | Why: The "..50" modules parameters were used to configure 5000 series and | ||
340 | up devices; different set of module parameters also available for 4965 | ||
341 | with same functionalities. Consolidate both set into single place | ||
342 | in drivers/net/wireless/iwlwifi/iwl-agn.c | ||
343 | |||
344 | Who: Wey-Yi Guy <wey-yi.w.guy@intel.com> | ||
345 | |||
346 | ---------------------------- | ||
347 | |||
348 | What: iwl4965 alias support | ||
349 | When: 3.0 | ||
350 | Why: Internal alias support has been present in module-init-tools for some | ||
351 | time, the MODULE_ALIAS("iwl4965") boilerplate aliases can be removed | ||
352 | with no impact. | ||
353 | |||
354 | Who: Wey-Yi Guy <wey-yi.w.guy@intel.com> | ||
355 | |||
356 | --------------------------- | ||
357 | |||
358 | What: xt_NOTRACK | ||
359 | Files: net/netfilter/xt_NOTRACK.c | ||
360 | When: April 2011 | ||
361 | Why: Superseded by xt_CT | ||
362 | Who: Netfilter developer team <netfilter-devel@vger.kernel.org> | ||
363 | |||
364 | ---------------------------- | ||
365 | |||
366 | What: IRQF_DISABLED | ||
367 | When: 2.6.36 | ||
368 | Why: The flag is a NOOP as we run interrupt handlers with interrupts disabled | ||
369 | Who: Thomas Gleixner <tglx@linutronix.de> | ||
370 | |||
371 | ---------------------------- | ||
372 | |||
373 | What: PCI DMA unmap state API | ||
374 | When: August 2012 | ||
375 | Why: PCI DMA unmap state API (include/linux/pci-dma.h) was replaced | ||
376 | with DMA unmap state API (DMA unmap state API can be used for | ||
377 | any bus). | ||
378 | Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | ||
379 | |||
380 | ---------------------------- | ||
381 | |||
382 | What: iwlwifi disable_hw_scan module parameters | ||
383 | When: 3.0 | ||
384 | Why: Hareware scan is the prefer method for iwlwifi devices for | ||
385 | scanning operation. Remove software scan support for all the | ||
386 | iwlwifi devices. | ||
387 | |||
388 | Who: Wey-Yi Guy <wey-yi.w.guy@intel.com> | ||
389 | |||
390 | ---------------------------- | ||
391 | |||
392 | What: Legacy, non-standard chassis intrusion detection interface. | ||
393 | When: June 2011 | ||
394 | Why: The adm9240, w83792d and w83793 hardware monitoring drivers have | ||
395 | legacy interfaces for chassis intrusion detection. A standard | ||
396 | interface has been added to each driver, so the legacy interface | ||
397 | can be removed. | ||
398 | Who: Jean Delvare <khali@linux-fr.org> | ||
399 | |||
400 | ---------------------------- | ||
401 | |||
402 | What: i2c_driver.attach_adapter | ||
403 | i2c_driver.detach_adapter | ||
404 | When: September 2011 | ||
405 | Why: These legacy callbacks should no longer be used as i2c-core offers | ||
406 | a variety of preferable alternative ways to instantiate I2C devices. | ||
407 | Who: Jean Delvare <khali@linux-fr.org> | ||
408 | |||
409 | ---------------------------- | ||
410 | |||
411 | What: Opening a radio device node will no longer automatically switch the | ||
412 | tuner mode from tv to radio. | ||
413 | When: 3.3 | ||
414 | Why: Just opening a V4L device should not change the state of the hardware | ||
415 | like that. It's very unexpected and against the V4L spec. Instead, you | ||
416 | switch to radio mode by calling VIDIOC_S_FREQUENCY. This is the second | ||
417 | and last step of the move to consistent handling of tv and radio tuners. | ||
418 | Who: Hans Verkuil <hans.verkuil@cisco.com> | ||
419 | |||
420 | ---------------------------- | ||
421 | |||
422 | What: CONFIG_CFG80211_WEXT | ||
423 | When: as soon as distributions ship new wireless tools, ie. wpa_supplicant 1.0 | ||
424 | and NetworkManager/connman/etc. that are able to use nl80211 | ||
425 | Why: Wireless extensions are deprecated, and userland tools are moving to | ||
426 | using nl80211. New drivers are no longer using wireless extensions, | ||
427 | and while there might still be old drivers, both new drivers and new | ||
428 | userland no longer needs them and they can't be used for an feature | ||
429 | developed in the past couple of years. As such, compatibility with | ||
430 | wireless extensions in new drivers will be removed. | ||
431 | Who: Johannes Berg <johannes@sipsolutions.net> | ||
432 | |||
433 | ---------------------------- | ||
434 | |||
435 | What: g_file_storage driver | ||
436 | When: 3.8 | ||
437 | Why: This driver has been superseded by g_mass_storage. | ||
438 | Who: Alan Stern <stern@rowland.harvard.edu> | ||
439 | |||
440 | ---------------------------- | ||
441 | |||
442 | What: threeg and interface sysfs files in /sys/devices/platform/acer-wmi | ||
443 | When: 2012 | ||
444 | Why: In 3.0, we can now autodetect internal 3G device and already have | ||
445 | the threeg rfkill device. So, we plan to remove threeg sysfs support | ||
446 | for it's no longer necessary. | ||
447 | |||
448 | We also plan to remove interface sysfs file that exposed which ACPI-WMI | ||
449 | interface that was used by acer-wmi driver. It will replaced by | ||
450 | information log when acer-wmi initial. | ||
451 | Who: Lee, Chun-Yi <jlee@novell.com> | ||
452 | |||
453 | --------------------------- | ||
454 | |||
455 | What: /sys/devices/platform/_UDC_/udc/_UDC_/is_dualspeed file and | ||
456 | is_dualspeed line in /sys/devices/platform/ci13xxx_*/udc/device file. | ||
457 | When: 3.8 | ||
458 | Why: The is_dualspeed file is superseded by maximum_speed in the same | ||
459 | directory and is_dualspeed line in device file is superseded by | ||
460 | max_speed line in the same file. | ||
461 | |||
462 | The maximum_speed/max_speed specifies maximum speed supported by UDC. | ||
463 | To check if dualspeeed is supported, check if the value is >= 3. | ||
464 | Various possible speeds are defined in <linux/usb/ch9.h>. | ||
465 | Who: Michal Nazarewicz <mina86@mina86.com> | ||
466 | |||
467 | ---------------------------- | ||
468 | |||
469 | What: The XFS nodelaylog mount option | ||
470 | When: 3.3 | ||
471 | Why: The delaylog mode that has been the default since 2.6.39 has proven | ||
472 | stable, and the old code is in the way of additional improvements in | ||
473 | the log code. | ||
474 | Who: Christoph Hellwig <hch@lst.de> | ||
475 | |||
476 | ---------------------------- | ||
477 | |||
478 | What: iwlagn alias support | ||
479 | When: 3.5 | ||
480 | Why: The iwlagn module has been renamed iwlwifi. The alias will be around | ||
481 | for backward compatibility for several cycles and then dropped. | ||
482 | Who: Don Fry <donald.h.fry@intel.com> | ||
483 | |||
484 | ---------------------------- | ||
485 | |||
486 | What: pci_scan_bus_parented() | ||
487 | When: 3.5 | ||
488 | Why: The pci_scan_bus_parented() interface creates a new root bus. The | ||
489 | bus is created with default resources (ioport_resource and | ||
490 | iomem_resource) that are always wrong, so we rely on arch code to | ||
491 | correct them later. Callers of pci_scan_bus_parented() should | ||
492 | convert to using pci_scan_root_bus() so they can supply a list of | ||
493 | bus resources when the bus is created. | ||
494 | Who: Bjorn Helgaas <bhelgaas@google.com> | ||
495 | |||
496 | ---------------------------- | ||
497 | |||
498 | What: Low Performance USB Block driver ("CONFIG_BLK_DEV_UB") | ||
499 | When: 3.6 | ||
500 | Why: This driver provides support for USB storage devices like "USB | ||
501 | sticks". As of now, it is deactivated in Debian, Fedora and | ||
502 | Ubuntu. All current users can switch over to usb-storage | ||
503 | (CONFIG_USB_STORAGE) which only drawback is the additional SCSI | ||
504 | stack. | ||
505 | Who: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> | ||
506 | |||
507 | ---------------------------- | ||
508 | |||
509 | What: get_robust_list syscall | ||
510 | When: 2013 | ||
511 | Why: There appear to be no production users of the get_robust_list syscall, | ||
512 | and it runs the risk of leaking address locations, allowing the bypass | ||
513 | of ASLR. It was only ever intended for debugging, so it should be | ||
514 | removed. | ||
515 | Who: Kees Cook <keescook@chromium.org> | ||
516 | |||
517 | ---------------------------- | ||
518 | |||
519 | What: Removing the pn544 raw driver. | ||
520 | When: 3.6 | ||
521 | Why: With the introduction of the NFC HCI and SHDL kernel layers, pn544.c | ||
522 | is being replaced by pn544_hci.c which is accessible through the netlink | ||
523 | and socket NFC APIs. Moreover, pn544.c is outdated and does not seem to | ||
524 | work properly with the latest Android stacks. | ||
525 | Having 2 drivers for the same hardware is confusing and as such we | ||
526 | should only keep the one following the kernel NFC APIs. | ||
527 | Who: Samuel Ortiz <sameo@linux.intel.com> | ||
528 | |||
529 | ---------------------------- | ||
530 | |||
531 | What: setitimer accepts user NULL pointer (value) | ||
532 | When: 3.6 | ||
533 | Why: setitimer is not returning -EFAULT if user pointer is NULL. This | ||
534 | violates the spec. | ||
535 | Who: Sasikantha Babu <sasikanth.v19@gmail.com> | ||
536 | |||
537 | ---------------------------- | ||
538 | |||
539 | What: remove bogus DV presets V4L2_DV_1080I29_97, V4L2_DV_1080I30 and | ||
540 | V4L2_DV_1080I25 | ||
541 | When: 3.6 | ||
542 | Why: These HDTV formats do not exist and were added by a confused mind | ||
543 | (that was me, to be precise...) | ||
544 | Who: Hans Verkuil <hans.verkuil@cisco.com> | ||
545 | |||
546 | ---------------------------- | ||
547 | |||
548 | What: V4L2_CID_HCENTER, V4L2_CID_VCENTER V4L2 controls | ||
549 | When: 3.7 | ||
550 | Why: The V4L2_CID_VCENTER, V4L2_CID_HCENTER controls have been deprecated | ||
551 | for about 4 years and they are not used by any mainline driver. | ||
552 | There are newer controls (V4L2_CID_PAN*, V4L2_CID_TILT*) that provide | ||
553 | similar functionality. | ||
554 | Who: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> | ||
555 | |||
556 | ---------------------------- | ||
557 | |||
558 | What: cgroup option updates via remount | ||
559 | When: March 2013 | ||
560 | Why: Remount currently allows changing bound subsystems and | ||
561 | release_agent. Rebinding is hardly useful as it only works | ||
562 | when the hierarchy is empty and release_agent itself should be | ||
563 | replaced with conventional fsnotify. | ||
564 | |||
565 | ---------------------------- | ||
566 | |||
567 | What: xt_recent rev 0 | ||
568 | When: 2013 | ||
569 | Who: Pablo Neira Ayuso <pablo@netfilter.org> | ||
570 | Files: net/netfilter/xt_recent.c | ||
571 | |||
572 | ---------------------------- | ||
573 | |||
574 | What: KVM debugfs statistics | ||
575 | When: 2013 | ||
576 | Why: KVM tracepoints provide mostly equivalent information in a much more | ||
577 | flexible fashion. | ||
578 | |||
579 | ---------------------------- | ||
580 | |||
581 | What: at91-mci driver ("CONFIG_MMC_AT91") | ||
582 | When: 3.8 | ||
583 | Why: There are two mci drivers: at91-mci and atmel-mci. The PDC support | ||
584 | was added to atmel-mci as a first step to support more chips. | ||
585 | Then at91-mci was kept only for old IP versions (on at91rm9200 and | ||
586 | at91sam9261). The support of these IP versions has just been added | ||
587 | to atmel-mci, so atmel-mci can be used for all chips. | ||
588 | Who: Ludovic Desroches <ludovic.desroches@atmel.com> | ||
589 | |||
590 | ---------------------------- | ||
591 | |||
592 | What: net/wanrouter/ | ||
593 | When: June 2013 | ||
594 | Why: Unsupported/unmaintained/unused since 2.6 | ||
595 | |||
596 | ---------------------------- | ||
597 | |||
598 | What: V4L2 selections API target rectangle and flags unification, the | ||
599 | following definitions will be removed: V4L2_SEL_TGT_CROP_ACTIVE, | ||
600 | V4L2_SEL_TGT_COMPOSE_ACTIVE, V4L2_SUBDEV_SEL_*, V4L2_SUBDEV_SEL_FLAG_* | ||
601 | in favor of common V4L2_SEL_TGT_* and V4L2_SEL_FLAG_* definitions. | ||
602 | For more details see include/linux/v4l2-common.h. | ||
603 | When: 3.8 | ||
604 | Why: The regular V4L2 selections and the subdev selection API originally | ||
605 | defined distinct names for the target rectangles and flags - V4L2_SEL_* | ||
606 | and V4L2_SUBDEV_SEL_*. Although, it turned out that the meaning of these | ||
607 | target rectangles is virtually identical and the APIs were consolidated | ||
608 | to use single set of names - V4L2_SEL_*. This didn't involve any ABI | ||
609 | changes. Alias definitions were created for the original ones to avoid | ||
610 | any instabilities in the user space interface. After few cycles these | ||
611 | backward compatibility definitions will be removed. | ||
612 | Who: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> | ||
613 | |||
614 | ---------------------------- | ||
615 | |||
616 | What: Using V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT flags | ||
617 | to indicate a V4L2 memory-to-memory device capability | ||
618 | When: 3.8 | ||
619 | Why: New drivers should use new V4L2_CAP_VIDEO_M2M capability flag | ||
620 | to indicate a V4L2 video memory-to-memory (M2M) device and | ||
621 | applications can now identify a M2M video device by checking | ||
622 | for V4L2_CAP_VIDEO_M2M, with VIDIOC_QUERYCAP ioctl. Using ORed | ||
623 | V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT flags for M2M | ||
624 | devices is ambiguous and may lead, for example, to identifying | ||
625 | a M2M device as a video capture or output device. | ||
626 | Who: Sylwester Nawrocki <s.nawrocki@samsung.com> | ||
627 | |||
628 | ---------------------------- | ||
629 | |||
630 | What: OMAP private DMA implementation | ||
631 | When: 2013 | ||
632 | Why: We have a DMA engine implementation; all users should be updated | ||
633 | to use this rather than persisting with the old APIs. The old APIs | ||
634 | block merging the old DMA engine implementation into the DMA | ||
635 | engine driver. | ||
636 | Who: Russell King <linux@arm.linux.org.uk>, | ||
637 | Santosh Shilimkar <santosh.shilimkar@ti.com> | ||
638 | |||
639 | ---------------------------- | ||