Waiman Long 5ac893b8cb ipc: allow boot time extension of IPCMNI from 32k to 16M ... The maximum number of unique System V IPC identifiers was limited to 32k. That limit should be big enough for most use cases. However, there are some users out there requesting for more, especially those that are migrating from Solaris which uses 24 bits for unique identifiers. To satisfy the need of those users, a new boot time kernel option "ipcmni_extend" is added to extend the IPCMNI value to 16M. This is a 512X increase which should be big enough for users out there that need a large number of unique IPC identifier. The use of this new option will change the pattern of the IPC identifiers returned by functions like shmget(2). An application that depends on such pattern may not work properly. So it should only be used if the users really need more than 32k of unique IPC numbers. This new option does have the side effect of reducing the maximum number of unique sequence numbers from 64k down to 128. So it is a trade-off. The computation of a new IPC id is not done in the performance critical path. So a little bit of additional overhead shouldn't have any real performance impact. Link: http://lkml.kernel.org/r/20190329204930.21620-1-longman@redhat.com Signed-off-by: Waiman Long <longman@redhat.com> Acked-by: Manfred Spraul <manfred@colorfullife.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kees Cook <keescook@chromium.org> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-05-14 19:52:52 -07:00
..
ABI	Merge branch 'x86-mds-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-05-14 07:57:29 -07:00
accelerators
accounting	psi: introduce psi monitor	2019-05-14 19:52:48 -07:00
acpi/dsd	LED updates for 5.2-rc1.	2019-05-07 18:02:51 -07:00
admin-guide	ipc: allow boot time extension of IPCMNI from 32k to 16M	2019-05-14 19:52:52 -07:00
aoe
arm	ARM: 8833/1: Ensure that NEON code always compiles with Clang	2019-02-12 15:20:09 +00:00
arm64	Merge branch 'for-next/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into for-next/core	2019-05-03 10:18:08 +01:00
auxdisplay
backlight
block	block: null: Add documentation for "zone_nr_conv" param	2019-04-09 08:18:23 -06:00
blockdev	zram: idle writeback fixes and cleanup	2019-01-08 17:15:10 -08:00
bpf	docs/btf: fix the missing section marks	2019-05-09 15:59:59 -07:00
bus-devices
cdrom
cgroup-v1	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
cma
connector
console
core-api	lib: Move mathematic helpers to separate folder	2019-05-14 19:52:49 -07:00
cpu-freq	Documentation: cpu-freq: Frequencies aren't always sorted	2018-11-07 13:29:04 +01:00
crypto	crypto: shash - remove shash_desc::flags	2019-04-25 15:38:12 +08:00
dev-tools	gcov: docs: add a note on GCC vs Clang differences	2019-05-14 19:52:51 -07:00
device-mapper	dm cache: add support for discard passdown to the origin device	2019-03-05 14:53:52 -05:00
devicetree	dt-bindings: pps: pps-gpio PPS ECHO implementation	2019-05-14 19:52:51 -07:00
doc-guide	docs: doc-guide: remove the extension from .rst files	2019-04-19 12:46:27 -06:00
driver-api	This is the bulk of the GPIO changes for the v5.2 kernel cycle:	2019-05-11 10:54:43 -04:00
driver-model	drm-misc-next for 5.2:	2019-03-25 11:05:12 +01:00
early-userspace	Correct gen_init_cpio tool's documentation	2018-11-25 12:25:53 -07:00
EDID	Docs/EDID: Calculate CRC while building the code	2018-11-06 07:36:22 -07:00
extcon
fault-injection	doc: fault-injection: fix macro name in example	2019-01-07 15:36:11 -07:00
fb	fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line option	2019-01-16 17:42:35 +01:00
features	Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux	2019-05-07 19:34:17 -07:00
filesystems	autofs: add description of ignore pseudo mount option	2019-05-14 19:52:50 -07:00
firmware_class
firmware-guide	Documentation: ACPI: move video_extension.txt to firmware-guide/acpi and convert to reST	2019-04-25 23:07:20 +02:00
fmc
fpga
gpio	docs: gpio: convert docs to ReST and rename to *.rst	2019-04-23 23:30:07 +02:00
gpu	drm: add drm_format_helper.c to kerneldoc	2019-04-17 09:39:22 +02:00
hid	HID: doc: fix wrong data structure reference for UHID_OUTPUT	2018-12-18 14:55:22 +01:00
hwmon	hwmon: (lm75) Add support for TMP75B	2019-05-03 13:16:18 -07:00
i2c	i2c-piix4: Add Hygon Dhyana SMBus support	2019-05-03 16:47:54 +02:00
ia64
ide
iio
infiniband	Documentation/infiniband: update from locked to pinned_vm	2019-02-07 12:56:23 -07:00
input	doc: Change LXR references to elixir.bootlin.com	2019-02-01 16:05:03 -07:00
interconnect	interconnect: Add generic on-chip interconnect API	2019-01-22 13:37:25 +01:00
ioctl	seccomp: add a return code to trap to userspace	2018-12-11 16:28:41 -08:00
isdn
kbuild	moduleparam: Save information about built-in modules in separate file	2019-05-07 21:50:24 +09:00
kdump	kdump: Document kernel data exported in the vmcoreinfo note	2019-01-15 11:05:28 +01:00
kernel-hacking
laptops	Documentation: fix lg-laptop.rst warnings	2019-02-11 08:27:47 -07:00
leds	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
lightnvm
livepatch	docs/livepatch: Unify style of livepatch documentation in the ReST format	2019-05-07 16:06:28 -06:00
locking	Documentation/locking/lockdep: Drop last two chars of sample states	2019-03-04 12:55:18 -07:00
m68k
maintainer
md
media	media updates for v5.1-rc1	2019-05-08 11:13:17 -07:00
memory-devices
mic
mips
misc-devices	Documentation: add ibmvmc to toctree(index) and fix warnings	2019-01-14 08:37:17 -07:00
mmc
mtd
namespaces
netlabel
networking	Documentation: net: dsa: sja1105: Add info about supported traffic modes	2019-05-05 21:52:42 -07:00
nfc
nios2
nvdimm	libnvdimm/security: Add documentation for nvdimm security support	2018-12-21 12:44:41 -08:00
nvmem	Documentation: nvmem: document cell tables and lookup entries	2018-09-28 15:14:54 +02:00
openrisc
parisc
PCI	pci-v4.20-changes	2018-10-25 06:50:48 -07:00
pcmcia
perf	Documentation: perf: Add documentation for ThunderX2 PMU uncore driver	2018-12-06 12:29:47 +00:00
phy
platform
power	PM/EM: Document the Energy Model framework	2019-01-27 12:29:37 +01:00
powerpc	Documentation: powerpc: Expand the DAWR acronym	2019-05-03 02:54:58 +10:00
pps
process	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
pti
ptp
rapidio
RCU	doc: Fix typos and otherwise modernize checklist.txt	2019-03-26 14:37:06 -07:00
riscv
s390	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
scheduler	sched/doc: Document Energy Aware Scheduling	2019-01-27 12:29:37 +01:00
scsi	scsi: ufs-bsg: Allow reading descriptors	2019-02-27 09:00:02 -05:00
security	doc: security: Add kern-doc for lsm_hooks.h	2019-02-22 08:54:09 -07:00
serial	docs: serial: convert docs to ReST and rename to *.rst	2019-04-25 11:37:42 +02:00
sh	sh: remove board_time_init() callback	2018-12-18 16:13:04 +01:00
sound	ALSA: doc: my_chip has no element ioport	2019-04-03 11:55:47 +02:00
sparc	docs: sparc: convert to ReST	2019-05-08 17:13:35 -07:00
sphinx
sphinx-static	docs: improve readability for people with poorer eyesight	2018-10-07 09:16:50 -06:00
spi	spi-summary: document set_cs_timing	2019-04-08 14:13:43 +07:00
sysctl	userfaultfd/sysctl: add vm.unprivileged_userfaultfd	2019-05-14 09:47:45 -07:00
target	scsi: target/core: Remove the write_pending_status() callback function	2019-02-04 21:23:59 -05:00
thermal	docs: hwmon: Add an index file and rename docs to *.rst	2019-04-17 10:37:23 -07:00
timers	Docs: Correct /proc/stat path	2019-02-22 08:50:17 -07:00
trace	mm: move recent_rotated pages calculation to shrink_inactive_list()	2019-05-14 09:47:45 -07:00
translations	Some late arriving documentation changes. In particular, this contains the	2019-05-10 13:24:53 -04:00
usb	docs: usb: convert documents to ReST	2019-04-16 12:16:19 +02:00
userspace-api	Documentation: seccomp: unify list indentation	2019-03-18 12:00:28 -06:00
virtual	KVM: fix KVM_CLEAR_DIRTY_LOG for memory slots of unaligned size	2019-04-30 21:22:15 +02:00
vm	mm/hmm: add default fault flags to avoid the need to pre-fill pfns arrays	2019-05-14 09:47:48 -07:00
w1
watchdog	Documentation/watchdog: Add documentation mlx-wdt driver	2019-03-02 15:28:20 +01:00
wimax
x86	Merge branch 'x86-mds-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-05-14 07:57:29 -07:00
xilinx	Documentation: xilinx: Add documentation for eemi APIs	2018-10-09 13:26:05 +02:00
xtensa	xtensa: document boot parameter passing	2019-02-03 18:06:19 -08:00
.gitignore
atomic_bitops.txt	docs: atomic_bitops.txt: add a title for this document	2019-04-11 12:37:02 -06:00
atomic_t.txt	Documentation/atomic_t: Clarify signed vs unsigned	2019-03-18 10:27:52 -07:00
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
Changes
clearing-warn-once.txt	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
CodingStyle
conf.py	This is a fairly typical cycle for documentation. There's some welcome	2018-10-24 18:01:11 +01:00
cpu-load.txt
cputopology.txt	topology: Simplify cputopology.txt formatting and wording	2019-04-19 10:56:04 +02:00
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt	DMA mapping updates for 5.2	2019-05-09 08:40:55 -07:00
DMA-API.txt	virtio: fixes, cleanups	2019-03-10 12:47:57 -07:00
DMA-attributes.txt
DMA-ISA-LPC.txt	Documentation/DMA-ISA-LPC: fix an incorrect reference	2019-02-11 08:23:07 -07:00
docutils.conf
dontdiff	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
efi-stub.txt
eisa.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	Merge branch 'x86-mds-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-05-14 07:57:29 -07:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-per-CPU-kthreads.txt
kobject.txt	kref/kobject: Improve documentation	2018-12-06 13:57:03 +01:00
kprobes.txt	Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux	2019-05-07 19:34:17 -07:00
kref.txt
ldm.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lsm.txt
lzo.txt	lib/lzo: fix bugs for very short or empty input	2019-04-05 16:02:30 -10:00
mailbox.txt
Makefile	docs: Makefile: use latexmk if available	2019-04-01 14:33:42 -06:00
memory-barriers.txt	docs/memory-barriers.txt: Update I/O section to be clearer about CPU vs thread	2019-04-23 13:34:17 +01:00
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt	docs: ntb.txt: add blank lines to clean up some Sphinx warnings	2019-04-11 12:37:03 -06:00
numastat.txt
packing.txt	lib: Add support for generic packing operations	2019-05-03 10:49:17 -04:00
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pnp.txt
preempt-locking.txt	x86/fpu: Remove fpu__restore()	2019-04-09 19:27:42 +02:00
pwm.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt	futex: Update comments and docs about return values of arch futex code	2019-04-26 13:57:55 +01:00
rpmsg.txt
rtc.txt	Documentation: rtc: Correct location of rtctest.c	2019-03-25 10:34:55 -06:00
SAK.txt
sgi-ioc4.txt
siphash.txt
SM501.txt
smsc_ece1099.txt
speculation.txt	docs: speculation.txt: mark example blocks as such	2019-04-11 12:37:03 -06:00
static-keys.txt	static_keys.txt: Fix trivial spelling mistake	2019-02-06 16:44:16 -07:00
SubmittingPatches
svga.txt
switchtec.txt	NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB	2018-10-11 11:28:53 -05:00
sync_file.txt
tee.txt
this_cpu_ops.txt
unaligned-memory-access.txt	docs: unaligned-memory-access.txt: use a lowercase title	2019-04-11 12:37:03 -06:00
vfio-mediated-device.txt
vfio.txt
video-output.txt	docs: video-output.txt: convert it to ReST format	2019-04-11 12:37:03 -06:00
xillybus.txt
xz.txt
zorro.txt