Steven Rostedt c4f1fe47b1 tracing: Better separate SNAPSHOT and MAX_TRACE options ... The latency tracers (scheduler, irqsoff, etc) were created when tracing was first added. These tracers required a "snapshot" buffer that was the same size as the ring buffer being written to. When a new max latency was hit, the main ring buffer would swap with the snapshot buffer so that the trace leading up to the latency would be saved in the snapshot buffer (The snapshot buffer is never written to directly and the data within it can be viewed without fear of being overwritten). Later, a new feature was added to allow snapshots to be taken by user space or even event triggers. This created a "snapshot" file that allowed users to trigger a snapshot from user space to save the current trace. The config for this new feature (CONFIG_TRACER_SNAPSHOT) would select the latency tracer config (CONFIG_TRACER_MAX_LATENCY) as it would need all the functionality from it as it already existed. But this was incorrect. As the snapshot feature is really what the latency tracers need and not the other way around. Have CONFIG_TRACER_MAX_TRACE select CONFIG_TRACER_SNAPSHOT where the tracers that needs the max latency buffer selects the TRACE_MAX_TRACE which will then select TRACER_SNAPSHOT. Also, go through trace.c and trace.h and make the code that only needs the TRACER_MAX_TRACE protected by that and the code that always requires the snapshot to be protected by TRACER_SNAPSHOT. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Link: https://patch.msgid.link/20260208183856.767870992@kernel.org Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2026-02-08 21:01:13 -05:00
..
bpf	bpf: Reject BPF_MAP_TYPE_INSN_ARRAY in check_reg_const_str()	2026-01-07 19:03:46 -08:00
cgroup	kernel: cgroup: Add LGPL-2.1 SPDX license ID to legacy_freezer.c	2026-01-15 22:03:15 -10:00
configs	hung_task: panic when there are more than N hung tasks at the same time	2025-11-12 10:00:14 -08:00
debug	kdb: Adapt kdb_msg_write to work with NBCON consoles	2025-10-24 12:56:20 +02:00
dma	dma/pool: Avoid allocating redundant pools	2026-01-14 11:00:00 +01:00
entry	rseq: Switch to TIF_RSEQ if supported	2025-11-04 08:35:37 +01:00
events	perf: Fix refcount warning on event->mmap_count increment	2026-01-21 16:28:58 +01:00
futex	Futex changes for v6.19:	2025-12-10 17:21:30 +09:00
gcov	gcov: add support for GCC 15	2025-11-09 21:19:44 -08:00
irq	treewide: Update email address	2026-01-11 06:09:11 -10:00
kcsan	Kernel Concurrency Sanitizer (KCSAN) updates for v6.18	2025-10-02 08:31:44 -07:00
livepatch	livepatching changes for 6.19	2025-12-03 13:46:48 -08:00
liveupdate	kho: validate preserved memory map during population	2026-01-14 22:16:21 -08:00
locking	RCU pull request for v6.19	2025-12-03 12:18:07 -08:00
module	kernel: modules: Add SPDX license identifier to kmod.c	2026-01-15 16:58:28 -08:00
power	Merge branch 'pm-em'	2026-01-16 16:16:24 +01:00
printk	printk fixup for 6.19 rc6	2026-01-16 09:46:59 -08:00
rcu	srcu: Fix warning to permit SRCU-fast readers in NMI handlers	2026-01-30 10:43:58 -05:00
sched	sched/fair: Revert force wakeup preemption	2026-01-23 11:53:20 +01:00
time	clocksource: Reduce watchdog readout delay limit to prevent false positives	2026-01-21 11:33:11 +01:00
trace	tracing: Better separate SNAPSHOT and MAX_TRACE options	2026-02-08 21:01:13 -05:00
unwind	unwind_user/x86: Teach FP unwind about start of function	2025-10-29 10:29:58 +01:00
.gitignore	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-06-24 20:30:37 +09:00
acct.c	act: use credential guards in acct_write_process()	2025-11-04 12:36:49 +01:00
async.c
audit.c	audit: fix skb leak when audit rate limit is exceeded	2025-09-10 19:55:00 -04:00
audit.h	audit: fix comment misindentation in audit.h	2025-10-22 19:28:06 -04:00
audit_fsnotify.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
audit_tree.c	mount-related stuff for this cycle	2025-10-03 10:19:44 -07:00
audit_watch.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
auditfilter.c	audit: Use kzalloc() instead of kmalloc()/memset() in audit_krule_to_data()	2025-11-07 16:38:34 -05:00
auditsc.c	audit: merge loops in __audit_inode_child()	2025-11-07 16:50:42 -05:00
backtracetest.c
bounds.c	x86/asm: Remove ANNOTATE_DATA_SPECIAL usage	2025-12-03 16:53:19 +01:00
capability.c	capability: Remove unused has_capability	2025-03-07 22:03:09 -06:00
cfi.c	cfi: Move BPF CFI types and helpers to generic code	2025-07-31 18:23:53 -07:00
compat.c
configs.c
context_tracking.c	context_tracking: Make RCU watch ct_kernel_exit_state() warning	2025-03-04 18:44:29 -08:00
cpu.c	cpu: Make atomic hotplug callbacks run with interrupts disabled on UP	2025-12-10 15:49:11 +09:00
cpu_pm.c	syscore: Pass context data to callbacks	2025-11-14 10:01:52 +01:00
crash_core.c	crash: fix crashkernel resource shrink	2025-11-15 10:52:01 -08:00
crash_core_test.c	crash: add KUnit tests for crash_exclude_mem_range	2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c	crash_dump: retrieve dm crypt keys in kdump kernel	2025-05-21 10:48:21 -07:00
crash_reserve.c	crash: let architecture decide crash memory export to iomem_resource	2025-11-12 10:00:15 -08:00
cred.c	kernel-6.19-rc1.cred	2025-12-01 13:45:41 -08:00
delayacct.c	delayacct: remove redundant code and adjust indentation	2025-05-27 19:40:33 -07:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
exit.h
extable.c
fail_function.c
fork.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
freezer.c	freezer: Clarify that only cgroup1 freezer uses PM freezer	2025-10-30 20:10:27 +01:00
gen_kheaders.sh	kheaders: make it possible to override TAR	2025-08-06 10:23:36 +09:00
groups.c
hung_task.c	hung_task: add hung_task_sys_info sysctl to dump sys info on task-hung	2025-11-20 14:03:43 -08:00
iomem.c	mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()	2025-02-21 15:05:38 +01:00
irq_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
jump_label.c	jump_label: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
kallsyms.c	kallsyms: Fix wrong "big" kernel symbol type read from procfs	2025-11-24 16:56:24 +01:00
kallsyms_internal.h
kallsyms_selftest.c	kallsyms: use kmalloc_array() instead of kmalloc()	2025-09-28 11:36:14 -07:00
kallsyms_selftest.h
kcmp.c	kcmp: improve performance adding an unlikely hint to task comparisons	2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz	kernel: Fix "select" wording on HZ_250 description	2025-02-21 09:20:30 +01:00
Kconfig.kexec	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
Kconfig.locks
Kconfig.preempt	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
kcov.c	kcov: use write memory barrier after memcpy() in kcov_move_area()	2025-09-13 17:32:44 -07:00
kexec.c	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kexec_core.c	kernel/kexec: fix IMA when allocation happens in CMA area	2025-12-23 11:23:14 -08:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-03-16 22:30:47 -07:00
kexec_file.c	x86/kexec: carry forward the boot DTB on kexec	2025-09-13 17:32:43 -07:00
kexec_internal.h	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kheaders.c	kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()	2024-12-24 09:46:49 +01:00
kprobes.c	kprobes: Add missing kerneldoc for __get_insn_slot	2025-07-15 18:45:34 +09:00
kstack_erase.c	sysctl: remove __user qualifier from stack_erasing_sysctl buffer argument	2025-11-27 15:44:53 +01:00
ksyms_common.c
ksysfs.c	kexec: move sysfs entries to /sys/kernel/kexec	2025-11-27 14:24:42 -08:00
kthread.c	kthread: Warn if mm_struct lacks user_ns in kthread_use_mm()	2025-12-24 21:32:58 +01:00
latencytop.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
Makefile	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
module_signature.c
notifier.c	reboot: move reboot_notifier_list to kernel/reboot.c	2024-11-05 17:12:31 -08:00
nscommon.c	ns: rename is_initial_namespace()	2025-11-11 10:01:31 +01:00
nsproxy.c	nsproxy: fix free_nsproxy() and simplify create_new_namespaces()	2025-11-14 13:10:38 +01:00
nstree.c	nstree: fix kernel-doc comments for internal functions	2025-11-14 13:10:38 +01:00
padata.c	padata: remove __padata_list_init()	2025-11-14 18:15:49 +08:00
panic.c	panic: only warn about deprecated panic_print on write access	2026-01-19 12:30:01 -08:00
params.c	params: Replace deprecated strcpy() with strscpy() and memcpy()	2025-08-16 21:47:25 +02:00
pid.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
pid_namespace.c	pid: rely on common reference count behavior	2025-11-11 10:01:32 +01:00
pid_sysctl.h	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
profile.c
ptrace.c	rseq: Introduce struct rseq_data	2025-11-04 08:30:50 +01:00
range.c
reboot.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
regset.c
relay.c	relay: update relay to use mmap_prepare	2025-11-16 17:28:11 -08:00
resource.c	Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"	2025-11-27 14:24:45 -08:00
resource_kunit.c
rseq.c	rseq: Switch to fast path processing on exit to user	2025-11-04 08:34:39 +01:00
scftorture.c	scftorture: Handle NULL argument passed to scf_add_to_free_list().	2024-11-14 16:09:51 -08:00
scs.c	scs: fix a wrong parameter in __scs_magic	2025-11-12 10:00:13 -08:00
seccomp.c	Performance events updates for v6.18:	2025-09-30 11:11:21 -07:00
signal.c	signal: Move MMCID exit out of sighand lock	2025-11-25 19:45:40 +01:00
smp.c	smp: Introduce a helper function to check for pending IPIs	2025-11-19 18:06:50 +01:00
smpboot.c	sched/smp: Use the SMP version of idle_thread_set_boot_cpu()	2025-06-13 08:47:20 +02:00
smpboot.h
softirq.c	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
stacktrace.c
static_call.c
static_call_inline.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-01 15:02:03 +02:00
sys.c	Patch series in this pull request:	2025-10-02 18:44:54 -07:00
sys_ni.c	uprobes/x86: Add uprobe syscall to speed up uprobe	2025-08-21 20:09:20 +02:00
sysctl-test.c	sysctl: move u8 register test to lib/test_sysctl.c	2025-04-14 14:13:41 +02:00
sysctl.c	sysctl: Wrap do_proc_douintvec with the public function proc_douintvec_conv	2025-11-27 15:45:38 +01:00
task_work.c	task_work: Fix NMI race condition	2025-10-29 10:29:54 +01:00
taskstats.c	fdget(), more trivial conversions	2024-11-03 01:28:06 -05:00
torture.c	torture: Delay CPU-hotplug operations until boot completes	2025-08-14 15:26:30 -07:00
tracepoint.c	tracing: Guard __DECLARE_TRACE() use of __DO_TRACE_CALL() with SRCU-fast	2026-01-30 10:44:11 -05:00
tsacct.c	pid: change bacct_add_tsk() to use task_ppid_nr_ns()	2025-08-19 13:38:20 +02:00
ucount.c	ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()	2025-08-02 12:01:38 -07:00
uid16.c
uid16.h
umh.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
up.c
user-return-notifier.c
user.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
user_namespace.c	ns: move ns type into struct ns_common	2025-09-25 09:23:54 +02:00
utsname.c	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
utsname_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
vhost_task.c	vhost: Take a reference on the task in struct vhost_task.	2025-09-21 17:44:20 -04:00
vmcore_info.c	vmcoreinfo: track and log recoverable hardware errors	2025-11-27 14:24:44 -08:00
watch_queue.c	watch_queue: Use local kmap in post_one_notification()	2025-11-19 12:17:28 +01:00
watchdog.c	powerpc/watchdog: add support for hardlockup_sys_info sysctl	2026-01-14 22:16:22 -08:00
watchdog_buddy.c	watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu()	2025-07-31 11:28:03 -04:00
watchdog_perf.c	watchdog: skip checks when panic is in progress	2025-09-13 17:32:53 -07:00
workqueue.c	workqueue: Don't rely on wq->rescuer to stop rescuer	2025-11-21 09:45:36 -10:00
workqueue_internal.h