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Petr Mladek 3b2c77d000 livepatch: Allow to call a custom callback when freeing shadow variables 
We might need to do some actions before the shadow variable is freed.
For example, we might need to remove it from a list or free some data
that it points to.

This is already possible now. The user can get the shadow variable
by klp_shadow_get(), do the necessary actions, and then call
klp_shadow_free().

This patch allows to do it a more elegant way. The user could implement
the needed actions in a callback that is passed to klp_shadow_free()
as a parameter. The callback usually does reverse operations to
the constructor callback that can be called by klp_shadow_*alloc().

It is especially useful for klp_shadow_free_all(). There we need to do
these extra actions for each found shadow variable with the given ID.

Note that the memory used by the shadow variable itself is still released
later by rcu callback. It is needed to protect internal structures that
keep all shadow variables. But the destructor is called immediately.
The shadow variable must not be access anyway after klp_shadow_free()
is called. The user is responsible to protect this any suitable way.

Be aware that the destructor is called under klp_shadow_lock. It is
the same as for the contructor in klp_shadow_alloc().

Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2018-04-17 13:42:48 +02:00
..
ABI Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching 2018-01-31 13:02:18 -08:00
accounting
acpi ACPI / LPIT: Add Low Power Idle Table (LPIT) support 2017-10-11 15:38:10 +02:00
admin-guide Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-01-30 10:15:30 -08:00
aoe
arm ARM: sunxi: add support for R40 SoC 2017-09-22 21:57:09 +02:00
arm64 arm64 updates for 4.16: 2018-01-30 13:57:43 -08:00
auxdisplay
backlight
blackfin
block block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP 2017-11-14 20:13:33 -07:00
blockdev SCSI misc on 20170907 2017-09-07 21:11:05 -07:00
bpf bpf: document answers to common questions about BPF 2017-11-01 21:01:47 +09:00
bus-devices
cdrom documentation: Update ide-cd documentation to reflect CONFIG_BLK_DEV_HD_IDE removal 2017-10-12 11:25:31 -06:00
cgroup-v1 Documentation: Fix 'file_mapped' -> 'mapped_file' 2018-01-30 09:52:11 -08:00
cma
connector
console
core-api genericirq.rst: Remove :c:func:... in code blocks 2017-12-02 08:41:46 -07:00
cpu-freq cpufreq: stats: Handle the case when trans_table goes beyond PAGE_SIZE 2017-11-08 23:41:25 +01:00
cpuidle
cris
crypto crypto: doc - adapt api sample to use async. op wait 2017-11-03 22:11:23 +08:00
dev-tools Kbuild misc updates for v4.15 2017-11-17 17:51:33 -08:00
device-mapper dm cache: Documentation: update default migration_throttling value 2018-01-30 16:55:47 -05:00
devicetree Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2018-01-31 13:00:01 -08:00
doc-guide Documentation: fix ref to sphinx/kerneldoc.py 2017-10-19 12:57:10 -06:00
driver-api DMAengine updates for v4.16-rc1 2018-01-31 11:52:20 -08:00
driver-model serdev: Introduce devm_serdev_device_open() 2018-01-08 10:08:34 +00:00
early-userspace
EDID
extcon
fault-injection cpu/hotplug: Get rid of CPU hotplug notifier leftovers 2017-11-13 10:03:53 +01:00
fb documentation: fb: update list of available compiled-in fonts 2017-11-08 03:39:52 -07:00
features Xtensa improvements for v4.16: 2018-01-29 16:40:28 -08:00
filesystems Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-01-31 09:25:20 -08:00
firmware_class
fmc
fpga
frv
gpio gpio: Fix a documentation spelling mistake 2018-01-21 16:52:31 +01:00
gpu docs: fix, intel_guc_loader.c has been moved to intel_guc_fw.c 2018-01-02 17:21:51 +02:00
hid Documentation: fix input related doc refs 2017-10-12 11:14:06 -06:00
hwmon hwmon: (pmbus/max31785) Add dual tachometer support 2018-01-02 15:05:34 -08:00
i2c i2c: i801: Add support for Intel Cedar Fork 2017-10-05 14:44:56 +02:00
ia64 kbuild: /bin/pwd -> pwd 2017-11-18 11:32:27 +09:00
ide
iio iio: adc: New driver for Cirrus Logic EP93xx ADC 2017-07-25 19:56:23 +01:00
infiniband Documentation: Hardware tag matching 2017-08-29 08:30:21 -04:00
input HID: hid-multitouch: support fine-grain orientation reporting 2017-12-01 10:01:01 +01:00
ioctl scsi: cxlflash: Introduce host ioctl support 2017-06-26 15:01:11 -04:00
isdn
kbuild kconfig: fix relational operators for bool and tristate symbols 2018-01-06 02:31:23 +09:00
kdump kexec/kdump: minor Documentation updates for arm64 and Image 2017-07-12 16:26:00 -07:00
kernel-hacking There has been a fair amount of activity in the docs tree this time 2017-07-03 21:13:25 -07:00
laptops Documentation: fix admin-guide doc refs 2017-10-12 11:13:28 -06:00
leds Documentation: leds: Update 00-INDEX file 2017-10-23 20:17:03 +02:00
lightnvm
livepatch livepatch: Allow to call a custom callback when freeing shadow variables 2018-04-17 13:42:48 +02:00
locking Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu 2018-01-03 14:14:18 +01:00
m68k
md raid5-ppl: PPL support for disks with write-back cache enabled 2018-01-15 14:29:42 -08:00
media media: docs: add documentation for frontend attach info 2017-11-30 04:19:04 -05:00
memory-devices
metag
mic
mips
misc-devices
mmc MMC core: 2017-05-02 17:34:32 -07:00
mn10300
mtd mtd: spi-nor: add an API to restore the status of SPI flash chip 2017-12-13 00:36:00 +01:00
namespaces
netlabel
networking doc: clarification about setting SO_ZEROCOPY 2018-01-10 15:01:49 -05:00
nfc
nios2
nvdimm
nvmem NVMEM documentation fix: A minor typo 2017-08-24 13:31:58 -06:00
openrisc Documentation: openrisc: Updates to README 2017-10-30 21:37:53 +09:00
parisc
PCI docs: update old references for DocBook from the documentation 2017-05-16 08:44:19 -03:00
pcmcia
perf perf: ARM DynamIQ Shared Unit PMU support 2018-01-02 16:43:12 +00:00
phy
platform
power regulator: Changes for v4.16 2018-01-29 11:32:44 -08:00
powerpc powerpc updates for 4.13 2017-07-07 13:55:45 -07:00
pps drivers/pps: aesthetic tweaks to PPS-related content 2017-09-08 18:26:51 -07:00
process Merge branch 'perf/urgent' into perf/core, to pick up fixes and to refresh to v4.15 2017-12-06 23:37:06 +01:00
pti
ptp
rapidio
RCU Merge branches 'cond_resched.2017.12.04a', 'dyntick.2017.11.28a', 'fixes.2017.12.11a', 'srbd.2017.12.05a' and 'torture.2017.12.11a' into HEAD 2017-12-11 09:21:58 -08:00
s390
scheduler sched/deadline: Fix the description of runtime accounting in the documentation 2017-11-16 09:00:35 +01:00
scsi scsi: documentation: Fix case of 'scsi_device' struct mention(s) 2017-12-02 08:43:43 -07:00
security KEYS: fix in-kernel documentation for keyctl_read() 2017-11-15 16:38:44 +00:00
serial tty: n_gsm: do not send/receive in ldisc close path 2017-06-03 18:48:52 +09:00
sh docs-rst: convert sh book to ReST 2017-05-16 08:44:18 -03:00
sound sound updates for 4.15-rc1 2017-11-14 18:01:46 -08:00
sparc
sphinx Documentation/sphinx: fix kernel-doc decode for non-utf-8 locale 2017-08-31 13:36:28 -06:00
sphinx-static docs RTD theme: code-block with line nos - lines and line numbers don't line up. 2017-07-17 13:48:45 -06:00
spi spi: Document SPI slave controller support 2017-05-26 13:11:00 +01:00
sysctl Revert "mm/page-writeback.c: print a warning if the vm dirtiness settings are illogical" 2017-11-29 18:40:43 -08:00
target Documentation/target: add an example script to configure an iSCSI target 2017-05-01 22:21:35 -07:00
thermal cpu_cooling: Remove static-power related documentation 2018-01-03 13:11:48 +01:00
timers docs: highres: fix broken urls 2017-09-26 14:58:23 -06:00
trace Char/Misc patches for 4.15-rc1 2017-11-16 09:10:59 -08:00
translations A few late-arriving docs updates that have no real reason to wait. There's 2017-11-23 21:01:32 -10:00
usb Documentation: usb: fix typo in UVC gadgetfs config command 2018-01-11 18:39:52 +01:00
userspace-api seccomp: Implement SECCOMP_RET_KILL_PROCESS action 2017-08-14 13:46:50 -07:00
virtual KVM: PPC: Book3S: Provide information about hardware/firmware CVE workarounds 2018-01-19 15:17:01 +11:00
vm Documentation/vm/zswap.txt: update with same-value filled page feature 2017-12-14 16:00:48 -08:00
w1 w1: w1-gpio: Convert to use GPIO descriptors 2017-12-08 15:32:53 +01:00
watchdog Documentation: fix selftests related file refs 2017-10-19 12:58:21 -06:00
wimax
x86 Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-01-29 17:48:22 -08:00
xtensa xtensa: add support for KASAN 2017-12-16 22:37:12 -08:00
.gitignore
00-INDEX linux-kselftest-4.13-rc1-update 2017-07-07 14:04:47 -07:00
atomic_bitops.txt Documentation/locking/atomic: Add documents for new atomic_t APIs 2017-08-10 12:29:00 +02:00
atomic_t.txt Documentation/locking/atomic: Finish the document... 2017-08-25 11:06:33 +02:00
bcache.txt bcache.txt: standardize document format 2017-07-14 13:51:27 -06:00
bt8xxgpio.txt bt8xxgpio.txt: standardize document format 2017-07-14 13:51:27 -06:00
btmrvl.txt btmrvl.txt: standardize document format 2017-07-14 13:51:27 -06:00
bus-virt-phys-mapping.txt bus-virt-phys-mapping.txt: standardize document format 2017-07-14 13:51:28 -06:00
cachetlb.txt cachetlb.txt: standardize document format 2017-07-14 13:51:28 -06:00
cgroup-v2.txt cgroup, docs: document the root cgroup behavior of cpu and io controllers 2018-01-16 08:07:09 -08:00
Changes
circular-buffers.txt doc: De-emphasize smp_read_barrier_depends 2017-12-05 11:57:53 -08:00
clearing-warn-once.txt kernel debug: support resetting WARN*_ONCE 2017-11-17 16:10:00 -08:00
clk.txt clk.txt: standardize document format 2017-07-14 13:51:29 -06:00
CodingStyle
conf.py docs-rst: don't require adjustbox anymore 2017-09-08 10:02:55 -06:00
cpu-load.txt cpu-load: standardize document format 2017-07-14 13:51:30 -06:00
cputopology.txt cputopology.txt: standardize document format 2017-07-14 13:51:30 -06:00
crc32.txt crc32.txt: standardize document format 2017-07-14 13:51:30 -06:00
dcdbas.txt dcdbas.txt: standardize document format 2017-07-14 13:51:31 -06:00
debugging-modules.txt
debugging-via-ohci1394.txt debugging-via-ohci1394.txt: standardize document format 2017-07-14 13:51:34 -06:00
dell_rbu.txt dell_rbu.txt: standardize document format 2017-07-14 13:58:12 -06:00
digsig.txt digsig.txt: standardize document format 2017-07-14 13:51:31 -06:00
DMA-API-HOWTO.txt DMA-API-HOWTO.txt: standardize document format 2017-07-14 13:51:32 -06:00
DMA-API.txt dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags 2017-09-01 11:59:17 +02:00
DMA-attributes.txt DMA-attributes.txt: standardize document format 2017-07-14 13:51:33 -06:00
DMA-ISA-LPC.txt DMA-ISA-LPC.txt: standardize document format 2017-07-14 13:51:33 -06:00
docutils.conf
dontdiff Remove gperf usage from toolchain 2017-08-19 11:02:53 -07:00
efi-stub.txt efi-stub.txt: standardize document format 2017-07-14 13:51:34 -06:00
eisa.txt eisa.txt: standardize document format 2017-07-14 13:51:34 -06:00
errseq.rst Documentation: add some docs for errseq_t 2017-07-29 09:01:02 -04:00
flexible-arrays.txt flexible-arrays.txt: standardize document format 2017-07-14 13:51:35 -06:00
futex-requeue-pi.txt futex-requeue-pi.txt: standardize document format 2017-07-14 13:51:35 -06:00
gcc-plugins.txt gcc-plugins.txt: standardize document format 2017-07-14 13:51:36 -06:00
highuid.txt highuid.txt: standardize document format 2017-07-14 13:51:36 -06:00
hw_random.txt hw_random.txt: standardize document format 2017-07-14 13:51:37 -06:00
hwspinlock.txt hwspinlock.txt: standardize document format 2017-07-14 13:51:37 -06:00
index.rst Make the main documentation title less Geocities 2017-06-23 14:02:27 -06:00
intel_txt.txt intel_txt.txt: standardize document format 2017-07-14 13:51:38 -06:00
Intel-IOMMU.txt Intel-IOMMU.txt: standardize document format 2017-07-14 13:51:38 -06:00
io_ordering.txt io_ordering.txt: standardize document format 2017-07-14 13:51:39 -06:00
io-mapping.txt io-mapping.txt: standardize document format 2017-07-14 13:51:38 -06:00
iostats.txt iostats.txt: update it to cover recent Kernels 2017-07-14 13:51:40 -06:00
IPMI.txt ipmi: Make IPMI panic strings always available 2017-09-27 16:03:45 -05:00
IRQ-affinity.txt IRQ-affinity.txt: standardize document format 2017-07-14 13:51:41 -06:00
IRQ-domain.txt irqdomain: Kill CONFIG_IRQ_DOMAIN_DEBUG 2018-01-24 12:32:58 +01:00
IRQ.txt IRQ.txt: add a markup for its title 2017-07-14 13:51:42 -06:00
irqflags-tracing.txt irqflags-tracing.txt: standardize document format 2017-07-14 13:51:42 -06:00
isa.txt isa.txt: standardize document format 2017-07-14 13:51:43 -06:00
isapnp.txt isapnp.txt: promote title level 2017-07-14 13:51:43 -06:00
kernel-doc-nano-HOWTO.txt docs: update old references for DocBook from the documentation 2017-05-16 08:44:19 -03:00
kernel-per-CPU-kthreads.txt kernel-per-CPU-kthreads.txt: standardize document format 2017-07-14 13:51:43 -06:00
kobject.txt kobject.txt: standardize document format 2017-07-14 13:51:44 -06:00
kprobes.txt kprobes/docs: Remove jprobes related documents 2017-10-20 11:02:55 +02:00
kref.txt kref.txt: standardize document format 2017-07-14 13:51:45 -06:00
ldm.txt ldm.txt: standardize document format 2017-07-14 13:51:45 -06:00
lockup-watchdogs.txt lockup-watchdogs.txt: standardize document format 2017-07-14 13:51:46 -06:00
logo.gif
logo.txt
lsm.txt docs-rst: convert lsm from DocBook to ReST 2017-05-16 08:44:19 -03:00
lzo.txt lzo.txt: standardize document format 2017-07-14 13:51:46 -06:00
mailbox.txt mailbox.txt: standardize document format 2017-07-14 13:51:47 -06:00
Makefile Documentation: add script and build target to check for broken file references 2017-10-12 11:07:42 -06:00
memory-barriers.txt doc: De-emphasize smp_read_barrier_depends 2017-12-05 11:57:53 -08:00
memory-hotplug.txt memory-hotplug.txt: standardize document format 2017-07-14 13:57:53 -06:00
men-chameleon-bus.txt men-chameleon-bus.txt: standardize document format 2017-07-14 13:57:54 -06:00
nommu-mmap.txt nommu-mmap.txt: don't use all upper case on titles 2017-07-14 13:57:55 -06:00
ntb.txt This series converts a number of top-level documents to the RST format 2017-07-15 12:58:58 -07:00
numastat.txt numastat.txt: standardize document format 2017-07-14 13:57:56 -06:00
padata.txt padata.txt: standardize document format 2017-07-14 13:57:56 -06:00
parport-lowlevel.txt parport-lowlevel.txt: standardize document format 2017-07-14 13:57:57 -06:00
percpu-rw-semaphore.txt percpu-rw-semaphore.txt: standardize document format 2017-07-14 13:57:58 -06:00
phy.txt phy.txt: standardize document format 2017-07-14 13:57:58 -06:00
pi-futex.txt Documentation: fix locking rt-mutex doc refs 2017-10-19 12:56:44 -06:00
pnp.txt pnp.txt: standardize document format 2017-07-14 13:57:59 -06:00
preempt-locking.txt preempt-locking.txt: standardize document format 2017-07-14 13:58:00 -06:00
printk-formats.txt vsprintf: add printk specifier %px 2017-11-29 12:13:14 +11:00
pwm.txt pwm: Standardize document format 2017-07-06 08:23:30 +02:00
rbtree.txt rbtree: cache leftmost node internally 2017-09-08 18:26:48 -07:00
remoteproc.txt remoteproc.txt: standardize document format 2017-07-14 13:58:02 -06:00
rfkill.txt rfkill.txt: standardize document format 2017-07-14 13:58:02 -06:00
robust-futex-ABI.txt robust-futex-ABI.txt: standardize document format 2017-07-14 13:58:03 -06:00
robust-futexes.txt robust-futexes.txt: standardize document format 2017-07-14 13:58:03 -06:00
rpmsg.txt rpmsg.txt: standardize document format 2017-07-14 13:58:04 -06:00
rtc.txt rtc: add generic nvmem support 2017-07-07 13:14:14 +02:00
SAK.txt SAK.txt: standardize document format 2017-07-14 13:58:04 -06:00
sgi-ioc4.txt sgi-ioc4.txt: standardize document format 2017-07-14 13:58:05 -06:00
siphash.txt siphash.txt: standardize document format 2017-07-14 13:58:06 -06:00
SM501.txt SM501.txt: standardize document format 2017-07-14 13:58:06 -06:00
smsc_ece1099.txt smsc_ece1099.txt: standardize document format 2017-07-14 13:58:07 -06:00
static-keys.txt jump_label: Provide hotplug context variants 2017-08-10 12:28:59 +02:00
SubmittingPatches
svga.txt documentation/svga.txt: update outdated file 2017-11-20 10:45:50 -07:00
switchtec.txt NTB: switchtec_ntb: Update switchtec documentation with notes for NTB 2017-11-18 20:37:13 -05:00
sync_file.txt sync_file.txt: standardize document format 2017-05-24 13:01:27 -03:00
tee.txt tee.txt: standardize document format 2017-07-14 13:58:14 -06:00
this_cpu_ops.txt this_cpu_ops.txt: standardize document format 2017-07-14 13:58:08 -06:00
unaligned-memory-access.txt unaligned-memory-access.txt: standardize document format 2017-07-14 13:58:09 -06:00
vfio-mediated-device.txt vfio-mediated-device.txt: standardize document format 2017-07-14 13:58:10 -06:00
vfio.txt vfio.txt: standardize document format 2017-07-14 13:58:10 -06:00
video-output.txt
xillybus.txt xillybus.txt: standardize document format 2017-07-14 13:58:11 -06:00
xz.txt xz.txt: standardize document format 2017-07-14 13:58:11 -06:00
zorro.txt zorro.txt: standardize document format 2017-07-14 13:58:12 -06:00