Kristina Martsenko e0188a556d arm64: documentation: document tagged pointer stack constraints ... commit f0e421b1bf7af97f026e1bb8bfe4c5a7a8c08f42 upstream. Some kernel features don't currently work if a task puts a non-zero address tag in its stack pointer, frame pointer, or frame record entries (FP, LR). For example, with a tagged stack pointer, the kernel can't deliver signals to the process, and the task is killed instead. As another example, with a tagged frame pointer or frame records, perf fails to generate call graphs or resolve symbols. For now, just document these limitations, instead of finding and fixing everything that doesn't work, as it's not known if anyone needs to use tags in these places anyway. In addition, as requested by Dave Martin, generalize the limitations into a general kernel address tag policy, and refactor tagged-pointers.txt to include it. Fixes: d50240a5f6 ("arm64: mm: permit use of tagged pointers at EL0") Reviewed-by: Dave Martin <Dave.Martin@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-05-25 14:30:15 +02:00
..
ABI	iio: proximity: as3935: correct IIO_CHAN_INFO_RAW output	2016-07-27 09:47:36 -07:00
accounting
acpi	mfd: core: redo ACPI matching of the children devices	2015-10-26 15:25:53 +01:00
aoe
arm	ARM: dts: keystone: k2l: fix kernel crash when clk_ignore_unused is not in bootargs	2015-11-23 10:36:27 -08:00
arm64	arm64: documentation: document tagged pointer stack constraints	2017-05-25 14:30:15 +02:00
auxdisplay
backlight
blackfin
block	null_blk: register as a LightNVM device	2015-11-16 15:22:28 -07:00
blockdev
bus-devices
cdrom
cgroups	There is a nice new document from Neil on how pathname lookups work and	2015-11-05 15:59:24 -08:00
cma
connector
console
cpu-freq
cpuidle
cris
crypto	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
development-process
device-mapper	- Revert a dm-multipath change that caused a regression for unprivledged	2015-11-04 21:19:53 -08:00
devicetree	clk: sunxi: Add apb0 gates for H3	2017-05-02 21:19:47 -07:00
dmaengine
DocBook	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-11-10 09:33:06 -08:00
driver-model
dvb
early-userspace
EDID
extcon
fault-injection
fb
features	arm64 updates for 4.4:	2015-11-04 14:47:13 -08:00
filesystems	proc: revert /proc/<pid>/maps [stack:TID] annotation	2016-09-15 08:27:46 +02:00
firmware_class
fmc
fpga
frv
gpio	There is a nice new document from Neil on how pathname lookups work and	2015-11-05 15:59:24 -08:00
hid
hwmon	ARM: SoC driver updates for v4.4	2015-11-10 15:00:03 -08:00
i2c	i2c: i801: add Intel Lewisburg device IDs	2015-11-20 16:22:21 +01:00
ia64
ide
infiniband
input	Input: add userio module	2015-10-27 18:55:31 -07:00
ioctl	char/misc drivers for 4.4-rc1	2015-11-04 22:15:15 -08:00
isdn
ja_JP
kbuild
kdump
ko_KR
laptops
leds
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 16:10:43 -08:00
m68k
memory-devices
metag
mic	samples: move mic/mpssd example code from Documentation	2017-03-12 06:37:23 +01:00
mips
misc-devices
mmc	mmc: core: Remove MMC_CLKGATE	2015-10-26 16:00:09 +01:00
mn10300
mtd
namespaces
netlabel
networking	netlink: remove mmapped netlink support	2017-03-22 12:04:13 +01:00
nfc
nios2
nvdimm	libnvdimm: documentation clarifications	2015-11-12 09:55:23 -08:00
nvmem
parisc
PCI
pcmcia
phy
platform
power
powerpc
pps
prctl
pti
ptp
rapidio
RCU
s390
scheduler
scsi	scsi: fix race between simultaneous decrements of ->host_failed	2016-07-27 09:47:39 -07:00
security	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
serial	Fix OpenSSH pty regression on close	2016-06-01 12:15:52 -07:00
sh
sound	ALSA: hda - Remove obsoleted documentation	2015-10-17 18:34:24 +02:00
spi
sysctl	mnt: Add a per mount namespace limit on the number of mounts	2017-04-30 05:49:28 +02:00
target	target: use per-attribute show and store methods	2015-10-13 22:17:49 -07:00
thermal
timers
tpm
trace	Most of the changes are clean ups and small fixes. Some of them have	2015-11-06 13:30:20 -08:00
usb	usb: core: lpm: fix usb3_hardware_lpm sysfs node	2016-01-31 11:28:58 -08:00
vDSO
video4linux	[media] media: videobuf2: Change queue_setup argument	2015-10-20 14:48:39 -02:00
virtual	KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state	2017-01-09 08:07:49 +01:00
vm	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
w1
watchdog
wimax
x86	Revert "x86/mm: Expand the exception table logic to allow new handling options"	2016-10-31 19:56:26 -06:00
xtensa
zh_CN
00-INDEX
adding-syscalls.txt
applying-patches.txt
assoc_array.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
Changes	There is a nice new document from Neil on how pathname lookups work and	2015-11-05 15:59:24 -08:00
circular-buffers.txt
clk.txt
coccinelle.txt
CodeOfConflict
CodingStyle
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt	dma: remove external references to dma_supported	2015-11-09 15:11:24 -08:00
DMA-attributes.txt
dma-buf-sharing.txt
DMA-ISA-LPC.txt
dontdiff	Documentation: dontdiff: remove media from dontdiff	2015-11-11 10:08:07 -07:00
dynamic-debug-howto.txt
edac.txt
efi-stub.txt
eisa.txt
email-clients.txt	A few more documentation patches that wandered in and have no reason to	2015-11-13 09:19:05 -08:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gdb-kernel-debugging.txt
highuid.txt
HOWTO
hsi.txt
hw_random.txt
hwspinlock.txt
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt	ipmi watchdog : add panic_wdt_timeout parameter	2015-11-16 06:28:43 -06:00
IRQ-affinity.txt
IRQ-domain.txt	irqdomain: Documentation updates	2015-10-13 19:01:25 +02:00
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kasan.txt	mm, slub, kasan: enable user tracking by default with KASAN=y	2015-11-05 19:34:48 -08:00
kernel-doc-nano-HOWTO.txt
kernel-docs.txt	kernel-docs.txt: update kernelnewbies reference	2015-10-11 15:36:43 -06:00
kernel-parameters.txt	x86/platform/goldfish: Prevent unconditional loading	2017-02-26 11:07:51 +01:00
kernel-per-CPU-kthreads.txt
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt
ldm.txt
local_ops.txt
lockup-watchdogs.txt	kernel/watchdog.c: add sysctl knob hardlockup_panic	2015-11-05 19:34:48 -08:00
logo.gif
logo.txt
lzo.txt
magic-number.txt
mailbox.txt
Makefile	samples: move mic/mpssd example code from Documentation	2017-03-12 06:37:23 +01:00
ManagementStyle
md-cluster.txt
md.txt
media-framework.txt
memory-barriers.txt	atomic: remove all traces of READ_ONCE_CTRL() and atomic*_read_ctrl()	2015-11-03 17:22:17 -08:00
memory-hotplug.txt
men-chameleon-bus.txt
module-signing.txt	Documentation/module-signing.txt: Note need for version info if reusing a key	2016-08-20 18:09:27 +02:00
mono.txt
nommu-mmap.txt
ntb.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pinctrl.txt	pinctrl: Flag strict is a field in struct pinmux_ops	2016-10-07 15:23:41 +02:00
pnp.txt
preempt-locking.txt
printk-formats.txt	lib/vsprintf.c: update documentation	2015-11-06 17:50:42 -08:00
pwm.txt
ramoops.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.txt
smsc_ece1099.txt
sparse.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches	A few more documentation patches that wandered in and have no reason to	2015-11-13 09:19:05 -08:00
svga.txt
sysfs-rules.txt
sysrq.txt
this_cpu_ops.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt
xz.txt
zorro.txt