Steven Rostedt dc1b157b82 tracing: Fix archs that still call tracepoints without RCU watching ... Tracepoints require having RCU "watching" as it uses RCU to do updates to the tracepoints. There are some cases that would call a tracepoint when RCU was not "watching". This was usually in the idle path where RCU has "shutdown". For the few locations that had tracepoints without RCU watching, there was an trace_*_rcuidle() variant that could be used. This used SRCU for protection. There are tracepoints that trace when interrupts and preemption are enabled and disabled. In some architectures, these tracepoints are called in a path where RCU is not watching. When x86 and arm64 removed these locations, it was incorrectly assumed that it would be safe to remove the trace_*_rcuidle() variant and also remove the SRCU logic, as it made the code more complex and harder to implement new tracepoint features (like faultable tracepoints and tracepoints in rust). Instead of bringing back the trace_*_rcuidle(), as it will not be trivial to do as new code has already been added depending on its removal, add a workaround to the one file that still requires it (trace_preemptirq.c). If the architecture does not define CONFIG_ARCH_WANTS_NO_INSTR, then check if the code is in the idle path, and if so, call ct_irq_enter/exit() which will enable RCU around the tracepoint. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/20241204100414.4d3e06d0@gandalf.local.home Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Fixes: 48bcda6848 ("tracing: Remove definition of trace_*_rcuidle()") Closes: https://lore.kernel.org/all/bddb02de-957a-4df5-8e77-829f55728ea2@roeck-us.net/ Acked-by: Paul E. McKenney <paulmck@kernel.org> Tested-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Madhavan Srinivasan <maddy@linux.ibm.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2024-12-05 09:28:58 -05:00
..
bpf	Summary	2024-11-22 20:36:11 -08:00
cgroup	cgroup: Changes for v6.13	2024-11-20 09:54:49 -08:00
configs	configs/debug: make sure PROVE_RCU_LIST=y takes effect	2024-10-28 10:21:09 -07:00
debug	kdb: fix ctrl+e/a/f/b/d/p/n broken in keyboard mode	2024-11-18 15:20:22 +00:00
dma	dma-debug: fix physical address calculation for struct dma_debug_entry	2024-11-28 10:19:16 +01:00
entry	sched: Add TIF_NEED_RESCHED_LAZY infrastructure	2024-11-05 12:55:37 +01:00
events	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
futex	futex: improve user space accesses	2024-11-25 12:11:55 -08:00
gcov	gcov: add support for GCC 14	2024-06-15 10:43:06 -07:00
irq	A set of updates for the interrupt subsystem:	2024-11-19 15:54:19 -08:00
kcsan	kcsan: Remove redundant call of kallsyms_lookup_name()	2024-10-14 16:44:56 +02:00
livepatch	livepatch: Replace snprintf() with sysfs_emit()	2024-07-02 16:56:18 +02:00
locking	Scheduler changes for v6.13:	2024-11-19 14:16:06 -08:00
module	Modules changes for v6.13-rc1	2024-11-27 10:20:50 -08:00
power	The biggest change here is eliminating the awful idea that KVM had, of	2024-11-23 16:00:50 -08:00
printk	printk changes for 6.13	2024-11-20 09:21:11 -08:00
rcu	A set of updates for the interrupt subsystem:	2024-11-19 15:54:19 -08:00
sched	sched_ext: Change for v6.13	2024-11-20 10:08:00 -08:00
time	ntp: Remove invalid cast in time offset math	2024-11-28 12:02:38 +01:00
trace	tracing: Fix archs that still call tracepoints without RCU watching	2024-12-05 09:28:58 -05:00
.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	lsm/stable-6.13 PR 20241112	2024-11-18 17:34:05 -08:00
audit.h	audit: change context data from secid to lsm_prop	2024-10-11 14:34:16 -04:00
auditfilter.c	audit: change context data from secid to lsm_prop	2024-10-11 14:34:16 -04:00
auditsc.c	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
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	lsm: constify the 'target' parameter in security_capget()	2023-08-08 16:48:47 -04:00
cfi.c
compat.c
configs.c
context_tracking.c	context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching	2024-08-15 21:30:43 +05:30
cpu_pm.c
cpu.c	Driver core changes for 6.13-rc1	2024-11-29 11:43:29 -08:00
crash_core.c	kexec/crash: no crash update when kexec in progress	2024-11-05 17:12:27 -08:00
crash_reserve.c	crash: fix crash memory reserve exceed system memory bug	2024-09-01 20:43:30 -07:00
cred.c	cred: Add a light version of override/revert_creds()	2024-11-11 10:45:04 +01:00
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	remove pointless includes of <linux/fdtable.h>	2024-10-07 13:34:41 -04:00
exit.h	exit: add internal include file with helpers	2023-09-21 12:03:50 -06:00
extable.c
fail_function.c
fork.c	Revert "fs: don't block i_writecount during exec"	2024-11-27 12:51:30 +01:00
freezer.c	sched/fair: Fix external p->on_rq users	2024-10-14 09:14:35 +02:00
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	hung_task: add detect count for hung tasks	2024-11-11 17:17:03 -08:00
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	kallsyms: Match symbols exactly with CONFIG_LTO_CLANG	2024-08-15 09:33:35 -07:00
kallsyms_selftest.h
kallsyms.c	kallsyms: Match symbols exactly with CONFIG_LTO_CLANG	2024-08-15 09:33:35 -07:00
kcmp.c	get rid of ...lookup...fdget_rcu() family	2024-10-07 13:34:41 -04:00
Kconfig.freezer
Kconfig.hz
Kconfig.kexec	crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32	2024-11-14 22:43:48 -08:00
Kconfig.locks
Kconfig.preempt	sched: No PREEMPT_RT=y for all{yes,mod}config	2024-11-07 15:25:05 +01:00
kcov.c	Updates for KCOV instrumentation on x86:	2024-09-17 12:40:34 +02:00
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	kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y	2024-09-01 17:59:01 -07:00
kexec_internal.h	kexec: use atomic_try_cmpxchg_acquire() in kexec_trylock()	2024-09-01 20:43:23 -07:00
kexec.c	crash: add a new kexec flag for hotplug support	2024-04-23 14:59:01 +10:00
kheaders.c
kprobes.c	kprobes: Use struct_size() in __get_insn_slot()	2024-10-31 11:00:58 +09:00
ksyms_common.c
ksysfs.c	profiling: remove prof_cpu_mask	2024-07-29 10:45:54 -07:00
kthread.c	get rid of __get_task_comm()	2024-11-05 17:12:28 -08:00
latencytop.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
Makefile	mm: move kernel/numa.c to mm/	2024-09-03 21:15:26 -07:00
module_signature.c
notifier.c	reboot: move reboot_notifier_list to kernel/reboot.c	2024-11-05 17:12:31 -08:00
nsproxy.c	fdget(), trivial conversions	2024-11-03 01:28:06 -05:00
padata.c	padata: Clean up in padata_do_multithreaded()	2024-11-10 11:50:54 +08:00
panic.c	drm next for 6.12-rc1	2024-09-19 10:18:15 +02:00
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	fdget(), more trivial conversions	2024-11-03 01:28:06 -05:00
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/reboot: replace sprintf() with sysfs_emit()	2024-11-11 17:17:05 -08:00
regset.c	regset: use kvzalloc() for regset_get_alloc()	2024-04-25 21:07:03 -07:00
relay.c	[tree-wide] finally take no_llseek out	2024-09-27 08:18:43 -07:00
resource_kunit.c	resource, kunit: fix user-after-free in resource_test_region_intersects()	2024-10-09 12:47:19 -07:00
resource.c	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
rseq.c
scftorture.c	scftorture: Handle NULL argument passed to scf_add_to_free_list().	2024-11-14 16:09:51 -08:00
scs.c
seccomp.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
signal.c	posix-timers: Target group sigqueue to current task only if not exiting	2024-11-29 13:19:09 +01:00
smp.c	locking/csd-lock: Switch from sched_clock() to ktime_get_mono_fast_ns()	2024-10-11 09:31:21 -07:00
smpboot.c	kthread: add kthread_stop_put	2023-10-04 10:41:57 -07:00
smpboot.h
softirq.c	A set of updates for the interrupt subsystem:	2024-11-19 15:54:19 -08:00
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	rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs()	2024-08-15 21:30:42 +05:30
sys_ni.c	Probes updates for v6.11:	2024-07-18 12:19:20 -07:00
sys.c	arm64 updates for 6.13:	2024-11-18 18:10:37 -08:00
sysctl-test.c	sysctl: Add module description to sysctl-testing	2024-06-03 15:20:37 +02:00
sysctl.c	sysctl: Reorganize kerneldoc parameter names	2024-10-23 15:28:40 +02:00
task_work.c	sched/core: Disable page allocation in task_tick_mm_cid()	2024-10-11 10:49:32 +02:00
taskstats.c	fdget(), more trivial conversions	2024-11-03 01:28:06 -05:00
torture.c	torture: Add MODULE_DESCRIPTION()	2024-05-30 15:31:38 -07:00
tracepoint.c	tracing: Fix syscall tracepoint use-after-free	2024-11-01 14:37:31 -04:00
tsacct.c	tsacct: replace strncpy() with strscpy()	2024-07-12 16:39:53 -07:00
ucount.c	Summary	2024-11-22 20:36:11 -08:00
uid16.c
uid16.h
umh.c	remove pointless includes of <linux/fdtable.h>	2024-10-07 13:34:41 -04:00
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: use kmemdup_array() instead of kmemdup() for multiple allocation	2024-09-09 16:47:42 -07:00
user-return-notifier.c
user.c	uidgid: make sure we fit into one cacheline	2024-09-12 12:16:09 +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	mm: support only one page_type per page	2024-09-03 21:15:43 -07:00
watch_queue.c	fdget(), trivial conversions	2024-11-03 01:28:06 -05:00
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	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
workqueue_internal.h	workqueue: Drop the special locking rule for worker->flags and worker_pool->flags	2023-08-07 15:57:22 -10:00
workqueue.c	workqueue: Reduce expensive locks for unbound workqueue	2024-11-15 06:43:39 -10:00