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linux/arch/s390/kernel
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Qian Cai de5d9dae15 s390/smp: move rcu_cpu_starting() earlier 
The call to rcu_cpu_starting() in smp_init_secondary() is not early
enough in the CPU-hotplug onlining process, which results in lockdep
splats as follows:

 WARNING: suspicious RCU usage
 -----------------------------
 kernel/locking/lockdep.c:3497 RCU-list traversed in non-reader section!!

 other info that might help us debug this:

 RCU used illegally from offline CPU!
 rcu_scheduler_active = 1, debug_locks = 1
 no locks held by swapper/1/0.

 Call Trace:
 show_stack+0x158/0x1f0
 dump_stack+0x1f2/0x238
 __lock_acquire+0x2640/0x4dd0
 lock_acquire+0x3a8/0xd08
 _raw_spin_lock_irqsave+0xc0/0xf0
 clockevents_register_device+0xa8/0x528
 init_cpu_timer+0x33e/0x468
 smp_init_secondary+0x11a/0x328
 smp_start_secondary+0x82/0x88

This is avoided by moving the call to rcu_cpu_starting up near the
beginning of the smp_init_secondary() function. Note that the
raw_smp_processor_id() is required in order to avoid calling into
lockdep before RCU has declared the CPU to be watched for readers.

Link: https://lore.kernel.org/lkml/160223032121.7002.1269740091547117869.tip-bot2@tip-bot2/
Signed-off-by: Qian Cai <cai@redhat.com>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2020-11-03 15:12:16 +01:00
..
syscalls
mm/madvise: introduce process_madvise() syscall: an external memory hinting API
2020-10-18 09:27:10 -07:00
vdso64
Kbuild updates for v5.10
2020-10-22 13:13:57 -07:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
alternative.c
s390: add automatic detection of the spectre defense
2018-03-28 08:38:24 +02:00
asm-offsets.c
s390/vdso: remove unused constants
2020-11-03 15:12:16 +01:00
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
audit.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
base.S
s390/base: remove unused s390_base_mcck_handler
2019-09-03 13:53:56 +02:00
cache.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_linux.c
s390: use generic UID16 implementation
2019-01-18 09:33:18 +01:00
compat_linux.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_ptrace.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_signal.c
signal: Remove task parameter from force_sig
2019-05-27 09:36:28 -05:00
cpcmd.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash_dump.c
s390/nvme: support firmware-assisted dump to NVMe disks
2020-10-02 14:40:48 +02:00
debug.c
s390/debug: debug feature version 3
2020-08-11 18:16:43 +02:00
diag.c
s390/diag: convert to use DEFINE_SEQ_ATTRIBUTE macro
2020-09-17 14:11:03 +02:00
dis.c
s390/dis: get rid of set_fs() usage
2020-09-17 14:11:03 +02:00
dumpstack.c
kernel: rename show_stack_loglvl() => show_stack()
2020-06-09 09:39:13 -07:00
early_printk.c
s390/sclp: remove unused sclp_early_printk_forced
2020-09-21 08:08:44 +02:00
early.c
s390: remove cad commandline option
2020-09-30 12:09:54 +02:00
ebcdic.c
s390: ebcdic: convert comments to UTF-8
2018-08-23 18:48:43 -07:00
entry.h
s390 updates for the 5.10 merge window
2020-10-16 12:36:38 -07:00
entry.S
s390: convert to GENERIC_VDSO
2020-08-26 18:47:21 +02:00
fpu.c
s390: correct some inline assembly constraints
2019-04-17 10:40:57 +02:00
ftrace.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
guarded_storage.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2017-11-13 11:47:01 -08:00
head64.S
s390/head64: correct init_task stack setup
2019-11-30 10:52:45 +01:00
idle.c
s390/idle: fix suspicious RCU usage
2020-09-14 10:08:07 +02:00
ima_arch.c
s390/kexec_file: Disable kexec_load when IPLed secure
2019-04-29 10:44:03 +02:00
ipl_vmparm.c
s390/ipl: provide uapi header for list directed IPL
2019-04-26 12:34:05 +02:00
ipl.c
s390/ipl: add support to control memory clearing for nvme re-IPL
2020-10-02 14:40:48 +02:00
irq.c
s390/irq: make init_ext_interrupts static
2020-03-11 14:18:44 +01:00
jump_label.c
s390/jump_label: remove unused structure definition
2019-06-07 10:10:10 +02:00
kdebugfs.c
s390: no need to check return value of debugfs_create functions
2019-01-28 15:58:55 +01:00
kexec_elf.c
kexec: Fix file verification on S390
2019-09-10 13:27:51 +01:00
kexec_image.c
kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE
2019-08-19 21:54:15 -07:00
kprobes_insn_page.S
s390/kprobes: move insn_page to text segment
2020-10-09 23:45:30 +02:00
kprobes.c
s390 updates for the 5.10 merge window
2020-10-16 12:36:38 -07:00
lgr.c
s390: convert to msecs_to_jiffies()
2020-06-29 16:31:46 +02:00
machine_kexec_file.c
s390/kexec_file: fix initrd location for kdump kernel
2020-05-14 23:21:37 +02:00
machine_kexec_reloc.c
s390/kaslr: add support for R_390_JMP_SLOT relocation type
2020-05-20 10:13:27 +02:00
machine_kexec.c
mm: remove unneeded includes of <asm/pgalloc.h>
2020-08-07 11:33:26 -07:00
Makefile
s390/kprobes: move insn_page to text segment
2020-10-09 23:45:30 +02:00
mcount.S
s390: support KPROBES_ON_FTRACE
2020-01-30 13:07:55 +01:00
module.c
s390/module: Use s390_kernel_write() for late relocations
2020-05-08 00:12:43 +02:00
nmi.c
s390: remove critical section cleanup from entry.S
2020-05-28 12:21:54 +02:00
nospec-branch.c
s390 updates for the 5.2 merge window
2019-05-06 16:42:54 -07:00
nospec-sysfs.c
s390: Convert IS_ENABLED uses to __is_defined
2019-04-11 13:36:53 +02:00
numa.c
s390/numa: move code to arch/s390/kernel
2020-08-11 18:16:55 +02:00
os_info.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
perf_cpum_cf_common.c
s390/cpum_cf: move common functions into a separate file
2019-02-22 09:19:55 +01:00
perf_cpum_cf_diag.c
s390/cpumf: Adjust registration of s390 PMU device drivers
2019-11-20 17:16:01 +01:00
perf_cpum_cf_events.c
s390/cpum_cf,perf: change DFLT_CCERROR counter name
2020-07-21 13:53:56 +02:00
perf_cpum_cf.c
s390/cpumf: Adjust registration of s390 PMU device drivers
2019-11-20 17:16:01 +01:00
perf_cpum_sf.c
s390/cpum_sf: prohibit callchain data collection
2020-07-01 20:02:33 +02:00
perf_event.c
s390: add error handling to perf_callchain_kernel
2019-10-31 17:20:54 +01:00
perf_regs.c
s390/perf: fix gcc 8 array-bounds warning
2018-07-02 11:24:54 +02:00
pgm_check.S
s390: add 3f program exception handler
2020-09-14 10:08:07 +02:00
process.c
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-09 13:33:54 -07:00
processor.c
s390/cpuinfo: do not skip info for CPUs without MHz feature
2020-03-23 13:41:55 +01:00
ptrace.c
s390/ptrace: fix storage key handling
2020-08-17 13:17:14 +02:00
reipl.S
s390: add missing ENDPROC statements to assembler functions
2019-05-02 13:54:11 +02:00
relocate_kernel.S
s390: add missing ENDPROC statements to assembler functions
2019-05-02 13:54:11 +02:00
runtime_instr.c
s390/runtime_instrumentation: fix storage key handling
2020-08-17 13:17:10 +02:00
setup.c
s390 updates for the 5.10 merge window
2020-10-16 12:36:38 -07:00
signal.c
tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()
2020-10-17 15:04:36 -06:00
smp.c
s390/smp: move rcu_cpu_starting() earlier
2020-11-03 15:12:16 +01:00
stacktrace.c
stacktrace: Remove reliable argument from arch_stack_walk() callback
2020-09-18 14:24:16 +01:00
sthyi.c
s390/sthyi: Fix machine name validity indication
2018-10-15 12:17:00 +02:00
sys_s390.c
s390: autogenerate compat syscall wrappers
2019-01-18 09:33:19 +01:00
sysinfo.c
s390: no need to check return value of debugfs_create functions
2019-01-28 15:58:55 +01:00
time.c
s390/stp: unify stp_work_mutex and clock_sync_mutex
2020-09-26 15:51:21 +02:00
topology.c
s390: convert to msecs_to_jiffies()
2020-06-29 16:31:46 +02:00
trace.c
s390/ftrace: fix potential crashes when switching tracers
2020-04-22 16:20:55 +02:00
traps.c
s390/kernel: expand exception table logic to allow new handling options
2020-07-20 10:55:50 +02:00
unwind_bc.c
s390/unwind: stop gracefully at user mode pt_regs in irq stack
2019-12-18 23:29:26 +01:00
uprobes.c
s390/uprobes: implement arch_uretprobe_is_alive()
2018-04-23 07:57:16 +02:00
uv.c
s390/kasan: support protvirt with 4-level paging
2020-09-16 14:08:48 +02:00
vdso.c
s390: convert to GENERIC_VDSO
2020-08-26 18:47:21 +02:00
vmlinux.lds.S
vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG
2020-09-01 09:50:35 +02:00
vtime.c
sched/cputime: Rename vtime_account_system() to vtime_account_kernel()
2019-10-09 12:39:25 +02:00