linux-kernelorg-stable/include/linux
Thomas Gleixner 76031d9536 clocksource: Make negative motion detection more robust
Guenter reported boot stalls on a emulated ARM 32-bit platform, which has a
24-bit wide clocksource.

It turns out that the calculated maximal idle time, which limits idle
sleeps to prevent clocksource wrap arounds, is close to the point where the
negative motion detection triggers.

  max_idle_ns:                    597268854 ns
  negative motion tripping point: 671088640 ns

If the idle wakeup is delayed beyond that point, the clocksource
advances far enough to trigger the negative motion detection. This
prevents the clock to advance and in the worst case the system stalls
completely if the consecutive sleeps based on the stale clock are
delayed as well.

Cure this by calculating a more robust cut-off value for negative motion,
which covers 87.5% of the actual clocksource counter width. Compare the
delta against this value to catch negative motion. This is specifically for
clock sources with a small counter width as their wrap around time is close
to the half counter width. For clock sources with wide counters this is not
a problem because the maximum idle time is far from the half counter width
due to the math overflow protection constraints.

For the case at hand this results in a tripping point of 1174405120ns.

Note, that this cannot prevent issues when the delay exceeds the 87.5%
margin, but that's not different from the previous unchecked version which
allowed arbitrary time jumps.

Systems with small counter width are prone to invalid results, but this
problem is unlikely to be seen on real hardware. If such a system
completely stalls for more than half a second, then there are other more
urgent problems than the counter wrapping around.

Fixes: c163e40af9 ("timekeeping: Always check for negative motion")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/all/8734j5ul4x.ffs@tglx
Closes: https://lore.kernel.org/all/387b120b-d68a-45e8-b6ab-768cd95d11c2@roeck-us.net
2024-12-05 16:03:24 +01:00
..
amba ARM: 9415/1: amba: Add dev_is_amba() function and export it for modules 2024-11-12 16:41:45 +00:00
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blk-mq.h block: don't reorder requests in blk_mq_add_to_batch 2024-11-13 12:04:58 -07:00
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clk.h
clkdev.h
clockchips.h
clocksource.h clocksource: Make negative motion detection more robust 2024-12-05 16:03:24 +01:00
clocksource_ids.h
closure.h
cma.h
cmpxchg-emu.h
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cnt32_to_63.h
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dw_apb_timer.h clocksource/drivers/dw_apb: Remove unused dw_apb_clockevent functions 2024-11-13 13:49:33 +01:00
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interconnect-provider.h
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interrupt.h
interval_tree.h
interval_tree_generic.h
io-64-nonatomic-hi-lo.h
io-64-nonatomic-lo-hi.h
io-mapping.h
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io_uring_types.h io_uring-6.13-20242901 2024-11-30 15:43:02 -08:00
ioam6.h
ioam6_genl.h
ioam6_iptunnel.h
iocontext.h
iomap.h New xfs code for 6.13 2024-11-21 09:20:07 -08:00
iommu-dma.h
iommu-helper.h
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iopoll.h
ioport.h
ioprio.h
ioremap.h
iosys-map.h
iov_iter.h
iova.h
iova_bitmap.h
ip.h
ipack.h
ipc.h
ipc_namespace.h
ipmi.h
ipmi_smi.h
ipv6.h
ipv6_route.h
irq.h
irq_poll.h
irq_sim.h
irq_work.h
irqbypass.h
irqchip.h
irqdesc.h
irqdomain.h
irqdomain_defs.h
irqflags.h
irqflags_types.h
irqhandler.h
irqnr.h
irqreturn.h
isa-dma.h
isa.h
isapnp.h
iscsi_boot_sysfs.h
iscsi_ibft.h
ism.h
iversion.h
jbd2.h jbd2: avoid dozens of -Wflex-array-member-not-at-end warnings 2024-11-13 12:56:48 -05:00
jhash.h
jiffies.h
journal-head.h
joystick.h
jump_label.h
jump_label_ratelimit.h
jz4740-adc.h
jz4780-nemc.h
kallsyms.h
kasan-checks.h
kasan-enabled.h
kasan-tags.h
kasan.h
kbd_diacr.h
kbd_kern.h
kbuild.h
kconfig.h
kcore.h
kcov.h
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kdb.h
kdebug.h
kdev_t.h
kern_levels.h
kernel-page-flags.h
kernel.h
kernel_read_file.h
kernel_stat.h
kernelcapi.h
kernfs.h
kexec.h
key-type.h
key.h
keyboard.h
keyctl.h
kfence.h
kfifo.h
kgdb.h
khugepaged.h
klist.h
kmemleak.h
kmod.h
kmsan-checks.h
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kmsan_string.h
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kmsg_dump.h
kobj_map.h
kobject.h
kobject_api.h
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kprobes.h
kref.h
kref_api.h
ks0108.h
ks8842.h
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ksm.h
kstrtox.h
kthread.h
ktime.h
ktime_api.h
kvm_dirty_ring.h
kvm_host.h KVM: x86: switch hugepage recovery thread to vhost_task 2024-11-14 13:20:04 -05:00
kvm_irqfd.h
kvm_para.h
kvm_types.h
l2tp.h
lantiq.h
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led-class-flash.h
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leds-regulator.h
leds-ti-lmu-common.h
leds.h
libata.h
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libgcc.h
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linkage.h
linkmode.h
linux_logo.h
lis3lv02d.h
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litex.h
livepatch.h
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llc.h
llist.h
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local_lock.h
local_lock_internal.h
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lp.h
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lwq.h
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mailbox_client.h
mailbox_controller.h
map_benchmark.h
maple.h
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marvell_phy.h
math.h
math64.h
mbcache.h
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mc6821.h
mc146818rtc.h
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mdio-bitbang.h
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mdio-mux.h
mdio.h mdio: Remove mdio45_ethtool_gset_npage() 2024-11-14 19:08:55 -08:00
mei_aux.h
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mem_encrypt.h
memblock.h
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mempolicy.h
mempool.h
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micrel_phy.h
microchipphy.h
migrate.h
migrate_mode.h
mii.h
mii_timestamper.h
min_heap.h
minmax.h
misc_cgroup.h
miscdevice.h
mm.h fuse update for 6.13 2024-11-26 12:41:27 -08:00
mm_api.h
mm_inline.h
mm_types.h - The series "zram: optimal post-processing target selection" from 2024-11-23 09:58:07 -08:00
mm_types_task.h
mman.h
mmap_lock.h
mmdebug.h Rename .data.once to .data..once to fix resetting WARN*_ONCE 2024-11-27 09:38:27 +09:00
mmiotrace.h
mmu_context.h
mmu_notifier.h
mmzone.h memcg/hugetlb: add hugeTLB counters to memcg 2024-11-14 22:49:19 -08:00
mnt_idmapping.h
mnt_namespace.h
mod_devicetable.h
module.h Kbuild updates for v6.13 2024-11-30 13:41:50 -08:00
module_signature.h
module_symbol.h
moduleloader.h
moduleparam.h
most.h
mount.h
moxtet.h
mpage.h
mpi.h
mpls.h
mpls_iptunnel.h
mroute.h
mroute6.h
mroute_base.h
msdos_fs.h
msdos_partition.h
msg.h
msi.h
msi_api.h
mtio.h
mutex.h
mutex_api.h
mutex_types.h
mv643xx_eth.h
mv643xx_i2c.h
mvebu-pmsu.h
mxm-wmi.h
namei.h
nd.h
ndctl.h
net.h
net_tstamp.h
netdev_features.h
netdevice.h ndo_fdb_del: Add a parameter to report whether notification was sent 2024-11-15 16:39:18 -08:00
netdevice_xmit.h
netfilter.h
netfilter_bridge.h
netfilter_defs.h
netfilter_ipv4.h
netfilter_ipv6.h
netfilter_netdev.h
netfs.h
netlink.h Networking changes for 6.13. 2024-11-21 08:28:08 -08:00
netpoll.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-19 13:56:02 +01:00
nfs.h
nfs3.h
nfs4.h
nfs_common.h
nfs_fs.h
nfs_fs_i.h
nfs_fs_sb.h
nfs_iostat.h
nfs_page.h
nfs_ssc.h
nfs_xdr.h
nfsacl.h
nfslocalio.h nfs_common: must not hold RCU while calling nfsd_file_put_local 2024-11-18 20:23:12 -05:00
nitro_enclaves.h
nl802154.h
nls.h
nmi.h
node.h
nodemask.h
nodemask_types.h
nospec.h
notifier.h
ns_common.h
nsc_gpio.h
nsproxy.h
ntb.h
ntb_transport.h
nubus.h
numa.h
numa_memblks.h
nvme-auth.h
nvme-fc-driver.h
nvme-fc.h
nvme-keyring.h
nvme-rdma.h
nvme-tcp.h
nvme.h nvme: introduce change ptpl and iekey definition 2024-11-21 08:57:41 -08:00
nvmem-consumer.h
nvmem-provider.h
nvram.h
oa_tc6.h
objagg.h
objpool.h
objtool.h
objtool_types.h
of.h of: base: Add for_each_child_of_node_with_prefix() 2024-11-27 12:04:01 +01:00
of_address.h
of_clk.h
of_device.h
of_dma.h
of_fdt.h
of_gpio.h
of_graph.h
of_iommu.h
of_irq.h
of_mdio.h
of_net.h
of_pci.h
of_pdt.h
of_platform.h
of_reserved_mem.h
oid_registry.h
olpc-ec.h
omap-dma.h
omap-gpmc.h
omap-iommu.h
omap-mailbox.h
omapfb.h
once.h Rename .data.once to .data..once to fix resetting WARN*_ONCE 2024-11-27 09:38:27 +09:00
once_lite.h Rename .data.once to .data..once to fix resetting WARN*_ONCE 2024-11-27 09:38:27 +09:00
oom.h
openvswitch.h
osq_lock.h
overflow.h
packing.h
padata.h
page-flags-layout.h
page-flags.h - The series "zram: optimal post-processing target selection" from 2024-11-23 09:58:07 -08:00
page-isolation.h
page_counter.h
page_ext.h
page_frag_cache.h
page_idle.h
page_owner.h
page_ref.h
page_reporting.h
page_table_check.h
pageblock-flags.h
pagemap.h
pagevec.h
pagewalk.h
panic.h
panic_notifier.h
papr_scm.h
parman.h
parport.h
parport_pc.h
parser.h
part_stat.h
pata_arasan_cf_data.h
patchkey.h
path.h
pch_dma.h
pci-acpi.h
pci-ats.h
pci-bwctrl.h thermal: Add PCIe cooling driver 2024-11-16 10:09:30 -06:00
pci-doe.h
pci-ecam.h
pci-ep-cfs.h
pci-epc.h PCI: endpoint: Fix pci_epc_map map_size kerneldoc string 2024-11-18 17:18:21 +00:00
pci-epf.h
pci-p2pdma.h
pci-pwrctrl.h PCI/pwrctrl: Rename pwrctrl functions and structures 2024-11-21 16:01:27 +00:00
pci-tph.h
pci.h pci-v6.13-changes 2024-11-26 18:05:44 -08:00
pci_hotplug.h
pci_ids.h USB / Thunderbolt (USB4) changes for 6.13-rc1 2024-11-29 11:19:31 -08:00
pcs-lynx.h
pcs-rzn1-miic.h
pe.h
peci-cpu.h
peci.h
percpu-defs.h
percpu-refcount.h
percpu-rwsem.h
percpu.h
percpu_counter.h
perf_event.h perf/core: Correct perf sampling with guest VMs 2024-11-14 10:40:01 +01:00
perf_event_api.h
perf_regs.h
personality.h
pfn.h
pfn_t.h
pgalloc_tag.h
pgtable.h
pgtable_api.h
phonet.h
phy.h net: phy: fix phy_ethtool_set_eee() incorrectly enabling LPI 2024-11-28 09:26:13 +01:00
phy_fixed.h
phy_led_triggers.h
phy_link_topology.h
phylib_stubs.h
phylink.h
pid.h
pid_namespace.h
pid_types.h
pidfs.h
pim.h
pipe_fs_i.h
pkeys.h
pktcdvd.h
pl320-ipc.h
platform_device.h Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
platform_profile.h
pldmfw.h
plist.h
plist_types.h
pm-trace.h
pm.h
pm_clock.h
pm_domain.h
pm_opp.h
pm_qos.h
pm_runtime.h
pm_wakeirq.h
pm_wakeup.h
pmbus.h
pmu.h
pnp.h
poison.h
poll.h
polynomial.h
posix-clock.h
posix-timers.h
posix-timers_types.h
posix_acl.h
posix_acl_xattr.h
power_supply.h
powercap.h
ppp-comp.h
ppp_channel.h
ppp_defs.h
pps_kernel.h
pr.h
prandom.h
preempt.h
prefetch.h
prime_numbers.h
printk.h printk: add dummy printk_force_console_enter/exit helpers 2024-11-13 11:00:23 +01:00
prmt.h
proc_fs.h
proc_ns.h
processor.h
profile.h
projid.h
property.h
pruss_driver.h
psci.h
pseudo_fs.h
psi.h
psi_types.h
psp-platform-access.h
psp-sev.h
psp-tee.h
psp.h
pstore.h
pstore_blk.h
pstore_ram.h
pstore_zone.h
ptdump.h
pti.h
ptp_classify.h
ptp_clock_kernel.h
ptp_kvm.h
ptp_mock.h
ptp_pch.h
ptr_ring.h
ptrace.h
ptrace_api.h
purgatory.h
pvclock_gtod.h
pwm.h
pwm_backlight.h
pxa2xx_ssp.h
pxa168_eth.h
qnx6_fs.h
quota.h
quotaops.h
radix-tree.h
raid_class.h
ramfs.h
random.h
randomize_kstack.h
range.h
ras.h
ratelimit.h
ratelimit_types.h
rational.h
rbtree.h
rbtree_augmented.h
rbtree_latch.h
rbtree_types.h
rcu_node_tree.h
rcu_notifier.h
rcu_segcblist.h
rcu_sync.h
rculist.h
rculist_bl.h
rculist_nulls.h
rcupdate.h Rename .data.unlikely to .data..unlikely 2024-11-27 09:38:27 +09:00
rcupdate_trace.h rcupdate_trace: Define rcu_tasks_trace lock guard 2024-11-23 17:47:53 -05:00
rcupdate_wait.h
rcuref.h
rcutiny.h
rcutree.h
rcuwait.h
rcuwait_api.h
reboot-mode.h
reboot.h
reciprocal_div.h
ref_tracker.h
refcount.h
refcount_api.h
refcount_types.h
regmap.h regmap: Updates for v6.13 2024-11-20 12:09:47 -08:00
regset.h
relay.h
remoteproc.h
resctrl.h
reset-controller.h
reset.h
resource.h
resource_ext.h
restart_block.h
resume_user_mode.h
rethook.h
rfkill.h
rhashtable-types.h
rhashtable.h
ring_buffer.h
rio.h
rio_drv.h
rio_ids.h
rio_regs.h
rmap.h
rmi.h
rndis.h
rodata_test.h
root_dev.h
rpmb.h
rpmsg.h
rseq.h
rslib.h
rtc.h
rtmutex.h
rtnetlink.h
rtsx_common.h
rtsx_pci.h
rtsx_usb.h
rv.h
rw_hint.h
rwbase_rt.h
rwlock.h
rwlock_api_smp.h
rwlock_rt.h
rwlock_types.h
rwsem.h
sbitmap.h
scatterlist.h
scc.h
sched.h - The series "resource: A couple of cleanups" from Andy Shevchenko 2024-11-25 16:09:48 -08:00
sched_clock.h
scmi_imx_protocol.h
scmi_protocol.h
scpi_protocol.h
screen_info.h
scs.h
sctp.h
scx200.h
scx200_gpio.h
seccomp.h
seccomp_types.h
secretmem.h
securebits.h
security.h lsm/stable-6.13 PR 20241112 2024-11-18 17:34:05 -08:00
sed-opal-key.h
sed-opal.h
seg6.h
seg6_genl.h
seg6_hmac.h
seg6_iptunnel.h
seg6_local.h
selection.h
sem.h
sem_types.h
semaphore.h
seq_buf.h
seq_file.h
seq_file_net.h
seqlock.h
seqlock_api.h
seqlock_types.h
serdev.h
serial.h
serial_8250.h
serial_bcm63xx.h
serial_core.h
serial_s3c.h
serial_sci.h
serio.h
set_memory.h
sfp.h
sh_clk.h
sh_dma.h
sh_eth.h
sh_intc.h
sh_timer.h
shdma-base.h
shm.h
shmem_fs.h - The series "zram: optimal post-processing target selection" from 2024-11-23 09:58:07 -08:00
shrinker.h
signal.h
signal_types.h
signalfd.h
siox.h
siphash.h
sizes.h
skb_array.h
skbuff.h
skbuff_ref.h
skmsg.h
slab.h slab updates for 6.13 2024-11-25 16:51:24 -08:00
slimbus.h
sm501-regs.h
sm501.h
smc91x.h
smp.h
smp_types.h
smpboot.h
smsc911x.h
smscphy.h
sock_diag.h
socket.h
sockptr.h net: Comment copy_from_sockptr() explaining its behaviour 2024-11-28 08:57:42 +01:00
softirq.h
sonet.h
sony-laptop.h
sonypi.h
sort.h
sound.h
soundcard.h
spinlock.h
spinlock_api.h
spinlock_api_smp.h
spinlock_api_up.h
spinlock_rt.h
spinlock_types.h
spinlock_types_raw.h
spinlock_types_up.h
spinlock_up.h
splice.h
spmi.h
sprintf.h
sram.h
srcu.h srcu: Unconditionally record srcu_read_lock_lite() in ->srcu_reader_flavor 2024-11-15 22:13:37 +01:00
srcutiny.h srcu: Unconditionally record srcu_read_lock_lite() in ->srcu_reader_flavor 2024-11-15 22:13:37 +01:00
srcutree.h srcu: Unconditionally record srcu_read_lock_lite() in ->srcu_reader_flavor 2024-11-15 22:13:37 +01:00
ssbi.h
stackdepot.h
stackleak.h
stackprotector.h
stacktrace.h
start_kernel.h
stat.h
statfs.h
static_call.h
static_call_types.h
static_key.h
stdarg.h
stddef.h
stm.h
stmmac.h
stmp3xxx_rtc_wdt.h
stmp_device.h
stop_machine.h
string.h printf: Remove unused 'bprintf' 2024-11-30 22:41:35 -05:00
string_choices.h
string_helpers.h
stringhash.h
stringify.h
sungem_phy.h
sunserialcore.h
sunxi-rsb.h
surface_acpi_notify.h
suspend.h
svga.h
sw842.h
swab.h
swait.h
swait_api.h
swap.h
swap_cgroup.h
swap_slots.h
swapfile.h
swapops.h
swiotlb.h
switchtec.h
sxgbe_platform.h
sync_core.h
sync_file.h
synclink.h
sys.h
sys_soc.h
syscall_user_dispatch.h
syscall_user_dispatch_types.h
syscalls.h
syscalls_api.h
syscore_ops.h
sysctl.h
sysfb.h
sysfs.h sysfs: attribute_group: allow registration of const bin_attribute 2024-11-15 19:29:16 +01:00
syslog.h
sysrq.h
sysv_fs.h
t10-pi.h
task_io_accounting.h
task_io_accounting_ops.h
task_work.h
taskstats_kern.h
tboot.h
tc.h
tca6416_keypad.h
tcp.h
tee_core.h
tee_drv.h
tegra-icc.h
termios_internal.h
text-patching.h
textsearch.h
textsearch_fsm.h
tfrc.h
thermal.h
thread_info.h
threads.h
thunderbolt.h
ti-emif-sram.h
ti_wilink_st.h
tick.h A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
tifm.h
timb_dma.h
timb_gpio.h
time.h
time32.h
time64.h
time_namespace.h
timecounter.h
timekeeper_internal.h
timekeeping.h
timer.h
timer_types.h
timerfd.h
timeriomem-rng.h
timerqueue.h
timerqueue_types.h
timex.h
tnum.h
topology.h
torture.h
toshiba.h
tpm.h tpm: Opt-in in disable PCR integrity protection 2024-11-13 21:10:45 +02:00
tpm_command.h
tpm_eventlog.h
trace.h
trace_clock.h
trace_events.h tracing: Record task flag NEED_RESCHED_LAZY. 2024-11-22 17:49:39 -05:00
trace_recursion.h
trace_seq.h
tracefs.h
tracepoint-defs.h
tracepoint.h Tracing updates for 6.13: 2024-11-28 11:46:13 -08:00
transport_class.h
ts-nbus.h
tsacct_kern.h
tsm.h
tty.h
tty_buffer.h
tty_driver.h
tty_flip.h
tty_ldisc.h
tty_port.h
turris-omnia-mcu-interface.h
typecheck.h
types.h
u64_stats_sync.h
u64_stats_sync_api.h
uacce.h
uaccess.h vfs-6.13.usercopy 2024-11-18 10:50:09 -08:00
ubsan.h
ucs2_string.h
udp.h net/udp: Add 4-tuple hash list basis 2024-11-18 11:56:21 +00:00
uidgid.h
uidgid_types.h
uio.h
uio_driver.h
umh.h
unaligned.h
unicode.h
union_find.h
units.h
unroll.h
uprobes.h
usb.h USB: make to_usb_device_driver() use container_of_const() 2024-11-14 17:57:33 +01:00
usb_usual.h
usbdevice_fs.h
user-return-notifier.h
user.h
user_events.h
user_namespace.h
userfaultfd_k.h
usermode_driver.h
util_macros.h
uts.h
utsname.h
uuid.h
vbox_utils.h
vdpa.h
verification.h
vermagic.h
vexpress.h
vfio.h
vfio_pci_core.h
vfs.h
vga_switcheroo.h
vgaarb.h
vhost_iotlb.h
via-core.h
via.h
via_i2c.h
videodev2.h
virtio.h VFIO updates for v6.13 2024-11-27 12:57:03 -08:00
virtio_anchor.h
virtio_byteorder.h
virtio_caif.h
virtio_config.h
virtio_dma_buf.h
virtio_net.h
virtio_pci_admin.h virtio-pci: Introduce APIs to execute device parts admin commands 2024-11-13 15:25:41 -07:00
virtio_pci_legacy.h
virtio_pci_modern.h
virtio_ring.h
virtio_vsock.h
vm_event_item.h
vmalloc.h
vmcore_info.h
vmpressure.h
vmstat.h
vmw_vmci_api.h
vmw_vmci_defs.h
vringh.h
vt.h
vt_buffer.h
vt_kern.h
vtime.h
w1.h
wait.h A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
wait_api.h
wait_bit.h
watch_queue.h
watchdog.h
win_minmax.h
wireless.h
wkup_m3_ipc.h
wm97xx.h
wmi.h
wordpart.h
workqueue.h
workqueue_api.h
workqueue_types.h
writeback.h Merge patch series "two little writeback cleanups v2" 2024-11-13 14:08:34 +01:00
ww_mutex.h
wwan.h
xarray.h
xattr.h
xxhash.h
xz.h
yam.h
zconf.h
zlib.h
zorro.h
zpool.h
zsmalloc.h
zstd.h
zstd_errors.h
zstd_lib.h
zswap.h
zutil.h