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linux-stable/kernel
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Peter Zijlstra 1d7f856c2c jump_label: Fix static_key_slow_dec() yet again 
While commit 83ab38ef0a0b ("jump_label: Fix concurrency issues in
static_key_slow_dec()") fixed one problem, it created yet another,
notably the following is now possible:

  slow_dec
    if (try_dec) // dec_not_one-ish, false
    // enabled == 1
                                slow_inc
                                  if (inc_not_disabled) // inc_not_zero-ish
                                  // enabled == 2
                                    return

    guard((mutex)(&jump_label_mutex);
    if (atomic_cmpxchg(1,0)==1) // false, we're 2

                                slow_dec
                                  if (try-dec) // dec_not_one, true
                                  // enabled == 1
                                    return
    else
      try_dec() // dec_not_one, false
      WARN

Use dec_and_test instead of cmpxchg(), like it was prior to
83ab38ef0a0b. Add a few WARNs for the paranoid.

Fixes: 83ab38ef0a0b ("jump_label: Fix concurrency issues in static_key_slow_dec()")
Reported-by: "Darrick J. Wong" <djwong@kernel.org>
Tested-by: Klara Modin <klarasmodin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
2024-09-10 11:57:27 +02:00
..
bpf
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
cgroup
Merge branch 'for-6.10-fixes' into for-6.11
2024-07-14 18:04:03 -10:00
configs
mm/slab: Plumb kmem_buckets into __do_kmalloc_node()
2024-07-03 12:24:19 +02:00
debug
kdb: Get rid of redundant kdb_curr_task()
2024-06-21 15:49:29 +01:00
dma
dma-debug: avoid deadlock between dma debug vs printk and netconsole
2024-08-06 10:29:32 -07:00
entry
entry: Respect changes to system call number by trace_sys_enter()
2024-03-12 13:23:32 +01:00
events
A lot of networking people were at a conference last week, busy
2024-07-25 13:32:25 -07:00
futex
printk: Change type of CONFIG_BASE_SMALL to bool
2024-05-06 17:39:09 +02:00
gcov
gcov: add support for GCC 14
2024-06-15 10:43:06 -07:00
irq
genirq/irqdesc: Honor caller provided affinity in alloc_desc()
2024-08-07 17:27:00 +02:00
kcsan
kcsan: Add missing MODULE_DESCRIPTION() macro
2024-06-06 11:21:14 -07:00
livepatch
livepatch: Replace snprintf() with sysfs_emit()
2024-07-02 16:56:18 +02:00
locking
rtmutex: Drop rt_mutex::wait_lock before scheduling
2024-08-15 15:38:53 +02:00
module
module: make waiting for a concurrent module loader interruptible
2024-08-09 08:33:28 -07:00
power
mm: remove the implementation of swap_free() and always use swap_free_nr()
2024-07-03 19:30:01 -07:00
printk
trivial printk changes for 6.11
2024-07-25 13:18:41 -07:00
rcu
Merge branches 'doc.2024.06.06a', 'fixes.2024.07.04a', 'mb.2024.06.28a', 'nocb.2024.06.03a', 'rcu-tasks.2024.06.06a', 'rcutorture.2024.06.06a' and 'srcu.2024.06.18a' into HEAD
2024-07-04 13:54:17 -07:00
sched
profiling: remove profile=sleep support
2024-08-04 13:36:28 -07:00
time
timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()
2024-08-05 16:14:14 +02:00
trace
ring-buffer: Remove unused function ring_buffer_nr_pages()
2024-08-07 20:26:44 -04:00
.gitignore
…
acct.c
kernel misc: Remove the now superfluous sentinel elements from ctl_table array
2024-04-24 09:43:53 +02:00
async.c
async: Use a dedicated unbound workqueue with raised min_active
2024-02-09 11:13:59 -10:00
audit_fsnotify.c
…
audit_tree.c
fsnotify: create a wrapper fsnotify_find_inode_mark()
2024-04-04 16:24:16 +02:00
audit_watch.c
fsnotify: create a wrapper fsnotify_find_inode_mark()
2024-04-04 16:24:16 +02:00
audit.c
audit: use KMEM_CACHE() instead of kmem_cache_create()
2024-01-25 10:12:22 -05:00
audit.h
…
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-06-13 14:26:50 -04:00
auditsc.c
audit,io_uring: io_uring openat triggers audit reference count underflow
2023-10-13 18:34:46 +02:00
backtracetest.c
backtracetest: add MODULE_DESCRIPTION()
2024-06-24 22:24:55 -07:00
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-04-29 08:29:29 -07:00
capability.c
…
cfi.c
…
compat.c
…
configs.c
…
context_tracking.c
context_tracking: Make context_tracking_key __ro_after_init
2024-03-22 11:18:18 +01:00
cpu_pm.c
…
cpu.c
- Unrelated x86/cc changes queued here to avoid ugly cross-merges and
2024-07-15 19:36:01 -07:00
crash_core.c
Mainly singleton patches, documented in their respective changelogs.
2024-05-19 14:02:03 -07:00
crash_reserve.c
crash: remove header files which are included more than once
2024-06-24 22:25:08 -07:00
cred.c
cred: Use KMEM_CACHE() instead of kmem_cache_create()
2024-02-23 17:33:31 -05:00
delayacct.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
dma.c
…
elfcorehdr.c
crash: remove dependency of FA_DUMP on CRASH_DUMP
2024-02-23 17:48:22 -08:00
exec_domain.c
…
exit.c
- 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN
2024-07-21 17:15:46 -07:00
exit.h
exit: add internal include file with helpers
2023-09-21 12:03:50 -06:00
extable.c
…
fail_function.c
…
fork.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
freezer.c
Linux 6.7-rc6
2023-12-23 15:52:13 +01:00
gen_kheaders.sh
kheaders: use command -v to test for existence of cpio
2024-05-30 01:13:20 +09:00
groups.c
groups: Convert group_info.usage to refcount_t
2023-09-29 11:28:39 -07:00
hung_task.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
iomem.c
kernel/iomem.c: remove __weak ioremap_cache helper
2023-08-21 13:37:28 -07:00
irq_work.c
…
jump_label.c
jump_label: Fix static_key_slow_dec() yet again
2024-09-10 11:57:27 +02:00
kallsyms_internal.h
kallsyms: get rid of code for absolute kallsyms
2024-07-20 16:33:21 +09:00
kallsyms_selftest.c
mm: vmalloc: enable memory allocation profiling
2024-04-25 20:55:57 -07:00
kallsyms_selftest.h
…
kallsyms.c
kallsyms: get rid of code for absolute kallsyms
2024-07-20 16:33:21 +09:00
kcmp.c
file: convert to SLAB_TYPESAFE_BY_RCU
2023-10-19 11:02:48 +02:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.kexec
crash: clean up kdump related config items
2024-02-23 17:48:22 -08:00
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: properly check for softirq context
2024-08-07 18:33:56 -07:00
kexec_core.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
kexec_elf.c
…
kexec_file.c
crash: add a new kexec flag for hotplug support
2024-04-23 14:59:01 +10:00
kexec_internal.h
crash: remove dependency of FA_DUMP on CRASH_DUMP
2024-02-23 17:48:22 -08:00
kexec.c
crash: add a new kexec flag for hotplug support
2024-04-23 14:59:01 +10:00
kheaders.c
…
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-05 14:04:03 +09:00
ksyms_common.c
…
ksysfs.c
profiling: remove prof_cpu_mask
2024-07-29 10:45:54 -07:00
kthread.c
kunit: Handle test faults
2024-05-06 14:22:02 -06:00
latencytop.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
Makefile
crash: split crash dumping code out from kexec_core.c
2024-02-23 17:48:22 -08:00
module_signature.c
…
notifier.c
…
nsproxy.c
pidfd: add pidfs
2024-03-01 12:23:37 +01:00
numa.c
kernel/numa.c: Move logging out of numa.h
2023-12-20 19:26:30 -05:00
padata.c
padata: Fix possible divide-by-0 panic in padata_mt_helper()
2024-08-07 18:33:56 -07:00
panic.c
kernel/panic: add verbose logging of kernel taints in backtraces
2024-06-24 22:25:05 -07:00
params.c
params: Fix multi-line comment style
2023-12-01 09:51:44 -08:00
pid_namespace.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
pid_sysctl.h
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
pid.c
pidfs: remove config option
2024-03-13 12:53:53 -07:00
profile.c
profiling: remove profile=sleep support
2024-08-04 13:36:28 -07:00
ptrace.c
ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()
2024-02-22 15:38:52 -08:00
range.c
…
reboot.c
kernel misc: Remove the now superfluous sentinel elements from ctl_table array
2024-04-24 09:43:53 +02:00
regset.c
regset: use kvzalloc() for regset_get_alloc()
2024-04-25 21:07:03 -07:00
relay.c
kernel: relay: remove relay_file_splice_read dead code, doesn't work
2023-12-29 12:22:27 -08:00
resource_kunit.c
resource: add missing MODULE_DESCRIPTION()
2024-06-28 19:36:30 -07:00
resource.c
resource: Export find_resource_space()
2024-05-28 11:14:14 -05:00
rseq.c
…
scftorture.c
scftorture: Make torture_type static
2024-05-30 15:31:51 -07:00
scs.c
…
seccomp.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
signal.c
kernel: rerun task_work while freezing in get_signal()
2024-07-11 01:51:44 -06:00
smp.c
smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu()
2024-07-10 22:40:39 +02:00
smpboot.c
kthread: add kthread_stop_put
2023-10-04 10:41:57 -07:00
smpboot.h
…
softirq.c
softirq: Fix suspicious RCU usage in __do_softirq()
2024-04-29 05:03:51 +02:00
stackleak.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
stacktrace.c
stacktrace: fix kernel-doc typo
2023-12-29 12:22:29 -08:00
static_call_inline.c
static_call: Replace pointless WARN_ON() in static_call_module_notify()
2024-09-06 16:29:22 +02:00
static_call.c
…
stop_machine.c
…
sys_ni.c
Probes updates for v6.11:
2024-07-18 12:19:20 -07:00
sys.c
RISC-V Patches for the 6.10 Merge Window, Part 1
2024-05-22 09:56:00 -07:00
sysctl-test.c
sysctl: Add module description to sysctl-testing
2024-06-03 15:20:37 +02:00
sysctl.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
task_work.c
task_work: make TWA_NMI_CURRENT handling conditional on IRQ_WORK
2024-07-29 12:05:06 -07:00
taskstats.c
taskstats: fill_stats_for_tgid: use for_each_thread()
2023-10-04 10:41:57 -07:00
torture.c
torture: Add MODULE_DESCRIPTION()
2024-05-30 15:31:38 -07:00
tracepoint.c
…
tsacct.c
tsacct: replace strncpy() with strscpy()
2024-07-12 16:39:53 -07:00
ucount.c
sysctl changes for v6.10-rc1
2024-05-17 17:31:24 -07:00
uid16.c
…
uid16.h
…
umh.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
up.c
smp: Change function signatures to use call_single_data_t
2023-09-13 14:59:24 +02:00
user_namespace.c
user_namespace: remove unnecessary NULL values from kbuf
2024-02-22 15:38:52 -08:00
user-return-notifier.c
…
user.c
printk: Change type of CONFIG_BASE_SMALL to bool
2024-05-06 17:39:09 +02:00
usermode_driver.c
…
utsname_sysctl.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
utsname.c
…
vhost_task.c
vhost_task: Handle SIGKILL by flushing work and exiting
2024-05-22 08:31:15 -04:00
vmcore_info.c
kallsyms: get rid of code for absolute kallsyms
2024-07-20 16:33:21 +09:00
watch_queue.c
watch_queue: fix kcalloc() arguments order
2023-12-21 13:17:54 +01:00
watchdog_buddy.c
…
watchdog_perf.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-07-17 21:11:34 -07:00
watchdog.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
workqueue_internal.h
…
workqueue.c
workqueue: Remove unneeded lockdep_assert_cpus_held()
2024-07-15 14:01:14 -10:00