Steven Rostedt (VMware) 29ce24519c ring-buffer: Do not trigger a WARN if clock going backwards is detected ... After tweaking the ring buffer to be a bit faster, a warning is triggering on one of my machines, and causing my tests to fail. This warning is caused when the delta (current time stamp minus previous time stamp), is larger than the max time held by the ring buffer (59 bits). If the clock were to go backwards slightly, this would then easily trigger this warning. The machine that it triggered on, the clock did go backwards by around 450 nanoseconds, and this happened after a recalibration of the TSC clock. Now that the ring buffer is faster, it detects this, and the delta that is used larger than the max, the warning is triggered and my test fails. To handle the clock going backwards, look at the saved before and after time stamps. If they are the same, it means that the current event did not interrupt another event, and that those timestamp are of a previous event that was recorded. If the max delta is triggered, look at those time stamps, make sure they are the same, then use them to compare with the current timestamp. If the current timestamp is less than the before/after time stamps, then that means the clock being used went backward. Print out a message that this has happened, but do not warn about it (and only print the message once). Still do the warning if the delta is indeed larger than what can be used. Also remove the unneeded KERN_WARNING from the WARN_ONCE() print. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2020-07-01 22:12:07 -04:00
..
bpf	bpf: Don't return EINVAL from {get,set}sockopt when optlen > PAGE_SIZE	2020-06-17 10:54:05 -07:00
cgroup	mmap locking API: convert mmap_sem comments	2020-06-09 09:39:14 -07:00
configs	compiler: remove CONFIG_OPTIMIZE_INLINING entirely	2020-04-07 10:43:42 -07:00
debug	kgdb: Avoid suspicious RCU usage warning	2020-06-26 15:41:40 +01:00
dma	dma-remap: align the size in dma_common_*_remap()	2020-06-23 14:14:41 +02:00
events	Merge branch 'akpm' (patches from Andrew)	2020-06-09 09:54:46 -07:00
gcov	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
irq	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
kcsan	kcsan: Support distinguishing volatile accesses	2020-06-11 20:04:01 +02:00
livepatch	livepatch: Make klp_apply_object_relocs static	2020-05-11 00:31:38 +02:00
locking	The X86 entry, exception and interrupt code rework	2020-06-13 10:05:47 -07:00
power	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
printk	Revert "kernel/printk: add kmsg SEEK_CUR handling"	2020-06-21 20:47:20 -07:00
rcu	rcu: Fixup noinstr warnings	2020-06-25 08:24:32 -07:00
sched	Peter Zijlstra says:	2020-06-28 10:37:39 -07:00
time	The X86 entry, exception and interrupt code rework	2020-06-13 10:05:47 -07:00
trace	ring-buffer: Do not trigger a WARN if clock going backwards is detected	2020-07-01 22:12:07 -04:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
acct.c	mmap locking API: convert mmap_sem comments	2020-06-09 09:39:14 -07:00
async.c
audit_fsnotify.c	fsnotify: use helpers to access data by data_type	2020-03-23 18:19:06 +01:00
audit_tree.c
audit_watch.c	\n	2020-04-06 08:58:42 -07:00
audit.c	audit/stable-5.8 PR 20200601	2020-06-02 17:13:37 -07:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-04-22 15:23:10 -04:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-04-22 15:23:10 -04:00
auditsc.c	audit: add subj creds to NETFILTER_CFG record to	2020-05-20 18:09:19 -04:00
backtracetest.c
bounds.c
capability.c
compat.c	uaccess: Selectively open read or write user access	2020-05-01 12:35:21 +10:00
configs.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
context_tracking.c	context_tracking: Ensure that the critical path cannot be instrumented	2020-06-11 15:14:36 +02:00
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-05-15 11:44:34 -07:00
cpu.c	The changes in this cycle are:	2020-06-03 13:06:42 -07:00
crash_core.c
crash_dump.c	crash_dump: Remove no longer used saved_max_pfn	2020-04-15 11:21:54 +02:00
cred.c	exec: Teach prepare_exec_creds how exec treats uids & gids	2020-05-20 14:44:21 -05:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	mmap locking API: convert mmap_sem comments	2020-06-09 09:39:14 -07:00
extable.c	kernel/extable.c: use address-of operator on section symbols	2020-04-07 10:43:42 -07:00
fail_function.c
fork.c	mmap locking API: convert nested write lock sites	2020-06-09 09:39:14 -07:00
freezer.c
futex.c	mmap locking API: use coccinelle to convert mmap_sem rwsem call sites	2020-06-09 09:39:14 -07:00
gen_kheaders.sh	kbuild: add variables for compression tools	2020-06-06 23:42:01 +09:00
groups.c	mm: remove the pgprot argument to __vmalloc	2020-06-02 10:59:11 -07:00
hung_task.c	kernel/hung_task.c: introduce sysctl to print all traces when a hung task is detected	2020-06-08 11:05:56 -07:00
iomem.c
irq_work.c	irq_work, smp: Allow irq_work on call_single_queue	2020-05-28 10:54:15 +02:00
jump_label.c
kallsyms.c	kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()	2020-04-07 10:43:44 -07:00
kcmp.c	kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve	2020-03-25 10:04:01 -05:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: check kcov_softirq in kcov_remote_stop()	2020-06-10 19:14:17 -07:00
kexec_core.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_elf.c
kexec_file.c	kexec: do not verify the signature without the lockdown or mandatory signature	2020-06-26 00:27:36 -07:00
kexec_internal.h	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kheaders.c
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-10 15:36:22 -07:00
kprobes.c	kretprobe: Prevent triggering kretprobe from within kprobe_flush_task	2020-06-16 21:21:01 -04:00
ksysfs.c
kthread.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
latencytop.c	sysctl: pass kernel pointers to ->proc_handler	2020-04-27 02:07:40 -04:00
Makefile	Notifications over pipes + Keyring notifications	2020-06-13 09:56:21 -07:00
module_signature.c
module_signing.c
module-internal.h
module.c	mm: remove vmalloc_exec	2020-06-26 00:27:38 -07:00
notifier.c	mm: remove vmalloc_sync_(un)mappings()	2020-06-02 10:59:12 -07:00
nsproxy.c	nsproxy: restore EINVAL for non-namespace file descriptor	2020-06-17 00:33:12 +02:00
padata.c	padata: add basic support for multithreaded jobs	2020-06-03 20:09:45 -07:00
panic.c	bug: Annotate WARN/BUG/stackfail as noinstr safe	2020-06-11 15:14:36 +02:00
params.c
pid_namespace.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
pid.c	remove the no longer needed pid_alive() check in __task_pid_nr_ns()	2020-04-30 06:40:14 -05:00
profile.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
ptrace.c	ptrace: reintroduce usage of subjective credentials in ptrace_has_cap()	2020-01-18 13:51:39 +01:00
range.c
reboot.c	printk: Collapse shutdown types into a single dump reason	2020-05-30 10:34:03 -07:00
relay.c	mmap locking API: convert mmap_sem comments	2020-06-09 09:39:14 -07:00
resource.c	/dev/mem: Revoke mappings when a driver claims the region	2020-05-27 11:10:05 +02:00
rseq.c	rseq: Reject unknown flags on rseq unregister	2019-12-25 10:41:20 +01:00
scs.c	scs: Report SCS usage in bytes rather than number of entries	2020-06-04 16:14:56 +01:00
seccomp.c	sysctl: pass kernel pointers to ->proc_handler	2020-04-27 02:07:40 -04:00
signal.c	Merge branch 'work.set_fs-exec' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-06-01 16:21:46 -07:00
smp.c	smp, irq_work: Continue smp_call_function*() and irq_work*() integration	2020-06-28 17:01:20 +02:00
smpboot.c
smpboot.h
softirq.c	x86/entry: Clarify irq_{enter,exit}_rcu()	2020-06-11 15:15:24 +02:00
stackleak.c
stacktrace.c
stop_machine.c	stop_machine: Make stop_cpus() static	2020-01-17 10:19:21 +01:00
sys_ni.c
sys.c	Add additional LSM hooks for SafeSetID	2020-06-14 11:39:31 -07:00
sysctl_binary.c
sysctl-test.c	kunit: allow kunit tests to be loaded as a module	2020-01-09 16:42:29 -07:00
sysctl.c	kernel/sysctl.c: ignore out-of-range taint bits introduced via kernel.tainted	2020-06-08 11:05:56 -07:00
task_work.c	task_work_run: don't take ->pi_lock unconditionally	2020-03-02 14:06:33 -07:00
taskstats.c
test_kprobes.c
torture.c	CPU (hotplug) updates:	2020-03-30 18:06:39 -07:00
tracepoint.c
tsacct.c	tsacct: add 64-bit btime field	2019-12-18 18:07:31 +01:00
ucount.c	ucount: Make sure ucounts in /proc/sys/user don't regress again	2020-04-07 21:51:27 +02:00
uid16.c
uid16.h
umh.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-05-15 13:48:59 -07:00
up.c	smp/up: Make smp_call_function_single() match SMP semantics	2020-02-07 15:34:12 +01:00
user_namespace.c	nsproxy: add struct nsset	2020-05-09 13:57:12 +02:00
user-return-notifier.c
user.c	user.c: make uidhash_table static	2020-06-04 19:06:24 -07:00
utsname_sysctl.c	sysctl: pass kernel pointers to ->proc_handler	2020-04-27 02:07:40 -04:00
utsname.c	nsproxy: add struct nsset	2020-05-09 13:57:12 +02:00
watch_queue.c	Notifications over pipes + Keyring notifications	2020-06-13 09:56:21 -07:00
watchdog_hld.c
watchdog.c	kernel/watchdog.c: convert {soft/hard}lockup boot parameters to sysctl aliases	2020-06-08 11:05:56 -07:00
workqueue_internal.h
workqueue.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00