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linux/arch/s390/kernel
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Sven Schnelle bb9a6585c2 s390/stp: Remove udelay from stp_sync_clock() 
[ Upstream commit b367017cda ]

When an stp sync check is handled on a system with multiple
cpus each cpu gets a machine check but only the first one
actually handles the sync operation. All other CPUs spin
waiting for the first one to finish with a short udelay().
But udelay can't be used here as the first CPU modifies tod_clock_base
before performing the sync op. During this timeframe
get_tod_clock_monotonic() might return a non-monotonic time.

The time spent waiting should be very short and udelay is a busy loop
anyways, therefore simply remove the udelay.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-28 16:24:20 +02:00
..
syscalls s390/syscalls: Avoid creation of arch/arch/ directory 2024-12-14 19:50:43 +01:00
vdso32 s390/vdso: Use standard stack frame layout 2024-06-16 13:39:40 +02:00
vdso64 s390/vdso: Use standard stack frame layout 2024-06-16 13:39:40 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
asm-offsets.c s390/dump: fix old lowcore virtual vs physical address confusion 2022-08-17 14:24:09 +02:00
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: remove unused s390_base_ext_handler 2020-11-09 11:20:58 +01:00
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 s390/signal: switch to using vdso for sigreturn and syscall restart 2021-07-08 22:09:47 +02:00
cpcmd.c s390/cpcmd: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
crash_dump.c s390/crashdump: fix TOD programmable field size 2022-12-02 17:41:07 +01:00
debug.c s390/sclp: add tracing of SCLP interactions 2021-08-25 11:03:35 +02:00
diag.c s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
dis.c s390/disassembler: add instructions 2021-07-27 09:39:19 +02:00
dumpstack.c exit: Add and use make_task_dead. 2023-02-01 08:27:20 +01:00
early.c s390/smp,mcck: fix early IPI handling 2024-09-04 13:23:21 +02:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
ebcdic.c s390: ebcdic: convert comments to UTF-8 2018-08-23 18:48:43 -07:00
entry.h s390/boot: allocate amode31 section in decompressor 2022-07-12 16:34:56 +02:00
entry.S s390/entry: Fix last breaking event handling in case of stack corruption 2025-07-10 15:57:41 +02:00
fpu.c s390: convert to generic entry 2021-01-19 12:29:26 +01:00
ftrace.c s390/ftrace: remove dead code 2023-03-17 08:48:57 +01:00
ftrace.h s390/ftrace: implement hotpatching 2021-08-03 14:31:40 +02:00
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/boot: move dma sections from decompressor to decompressed kernel 2021-07-27 09:39:17 +02:00
idle.c s390/idle: mark arch_cpu_idle() noinstr 2023-03-10 09:39:50 +01:00
ima_arch.c s390/kexec_file: Disable kexec_load when IPLed secure 2019-04-29 10:44:03 +02:00
ipl.c s390/ipl: Fix incorrect initialization of nvme dump block 2024-06-16 13:39:41 +02:00
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
irq.c s390/entry: fix duplicate tracking of irq nesting level 2021-12-22 09:32:36 +01:00
jump_label.c s390/jump_label: print real address in a case of a jump label bug 2021-07-27 09:39:13 +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.c s390/entry: Mark IRQ entries to fix stack depot warnings 2024-12-14 19:51:23 +01:00
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
lgr.c s390: convert to msecs_to_jiffies() 2020-06-29 16:31:46 +02:00
machine_kexec.c s390/maccess: rework absolute lowcore accessors 2022-08-17 14:24:13 +02:00
machine_kexec_file.c s390/kexec: fix ipl report address for kdump 2023-01-18 11:48:48 +01:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
Makefile s390: rename dma section to amode31 2021-08-05 14:10:53 +02:00
mcount.S s390/ftrace: fix ftrace_update_ftrace_func implementation 2021-07-15 12:54:58 +02:00
module.c mm: defer kmemleak object creation of module_alloc() 2022-03-08 19:12:38 +01:00
nmi.c exit: Add and use make_task_dead. 2023-02-01 08:27:20 +01:00
nospec-branch.c s390/speculation: Use statically initialized const for instructions 2021-06-28 11:18:28 +02:00
nospec-sysfs.c s390/facilities: move stfl information from lowcore to global data 2021-06-07 17:06:58 +02:00
numa.c s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
os_info.c s390/maccess: rework absolute lowcore accessors 2022-08-17 14:24:13 +02:00
perf_cpum_cf.c s390/cpumf: Handle events cycles and instructions identical 2022-06-29 09:03:26 +02:00
perf_cpum_cf_common.c s390/cpumf: Allow concurrent access for CPU Measurement Counter Facility 2021-07-05 12:44:23 +02:00
perf_cpum_cf_events.c s390/cpum_cf,perf: change DFLT_CCERROR counter name 2020-07-21 13:53:56 +02:00
perf_cpum_sf.c s390/cpum_sf: Handle CPU hotplug remove during sampling 2024-12-14 19:51:34 +01:00
perf_event.c s390/perf: obtain sie_block from the right address 2022-06-09 10:23:21 +02:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c sched: Add wrapper for get_wchan() to keep task blocked 2025-08-28 16:24:03 +02:00
processor.c s390: replace deprecated CPU-hotplug functions 2021-08-05 14:10:53 +02:00
ptrace.c s390/ptrace: handle setting of fpc register correctly 2024-02-23 08:54:40 +01:00
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/boot: Remove alt_stfle_fac_list from decompressor 2024-06-16 13:39:41 +02:00
signal.c s390: remove do_signal() prototype and do_notify_resume() function 2021-08-25 11:03:34 +02:00
smp.c memblock: drop memblock_free_early_nid() and memblock_free_early() 2025-03-13 12:50:07 +01:00
stacktrace.c stacktrace: Move documentation for arch_stack_walk_reliable() to header 2021-03-10 15:52:31 +01:00
sthyi.c KVM: s390: fix sthyi error handling 2023-08-11 15:13:49 +02:00
syscall.c s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART 2021-07-08 22:12:17 +02:00
sysinfo.c s390/sysinfo: get rid of register asm 2021-06-18 16:41:23 +02:00
text_amode31.S s390/diag: make restart_part2 a local label 2021-08-25 11:03:34 +02:00
time.c s390/stp: Remove udelay from stp_sync_clock() 2025-08-28 16:24:20 +02:00
topology.c s390/topology: honour nr_cpu_ids when adding CPUs 2023-06-09 10:32:25 +02:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390/traps: Fix test_monitor_call() inline assembly 2025-03-13 12:51:03 +01:00
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: Fix fall-through warnings for Clang 2021-07-13 14:43:09 -05:00
uv.c s390/uv: fully validate the VMA before calling follow_page() 2021-11-18 19:16:40 +01:00
vdso.c s390/vdso: add minimal compat vdso 2021-07-08 15:37:28 +02:00
vmlinux.lds.S s390/vmlinux.lds.S: Move ro_after_init section behind rodata section 2024-09-12 11:07:49 +02:00
vtime.c s390/vtime: fix average steal time calculation 2024-03-26 18:21:35 -04:00