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linux/arch/parisc/kernel
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Helge Deller dbeb9153de parisc: Mark cr16 CPU clocksource unstable on all SMP machines 
commit afdb4a5b1d upstream.

In commit c8c3735997 ("parisc: Enhance detection of synchronous cr16
clocksources") I assumed that CPUs on the same physical core are syncronous.
While booting up the kernel on two different C8000 machines, one with a
dual-core PA8800 and one with a dual-core PA8900 CPU, this turned out to be
wrong. The symptom was that I saw a jump in the internal clocks printed to the
syslog and strange overall behaviour.  On machines which have 4 cores (2
dual-cores) the problem isn't visible, because the current logic already marked
the cr16 clocksource unstable in this case.

This patch now marks the cr16 interval timers unstable if we have more than one
CPU in the system, and it fixes this issue.

Fixes: c8c3735997 ("parisc: Enhance detection of synchronous cr16 clocksources")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2021-12-08 09:04:55 +01:00
..
syscalls compat: remove some compat entry points 2021-09-08 15:32:35 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c parisc: Refactor alternative code to accept multiple conditions 2020-04-05 22:50:40 +02:00
asm-offsets.c parisc: Implement __get/put_kernel_nofault() 2021-09-09 22:53:09 +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
cache.c parisc: Flush kernel data mapping in set_pte_at() when installing pte for user page 2021-11-18 19:17:14 +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
drivers.c bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
entry.S parisc/entry: fix trace test in syscall exit path 2021-11-21 13:44:13 +01:00
firmware.c isystem: ship and use stdarg.h 2021-08-19 09:02:55 +09:00
ftrace.c ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs 2020-11-13 12:14:55 -05:00
hardware.c parisc: hardware: Update references to parisc website 2020-06-01 23:02:39 +02:00
head.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
hpmc.S parisc: Fix IVT checksum calculation wrt HPMC 2021-02-12 16:31:42 +01:00
inventory.c parisc: Add qemu fw_cfg interface 2020-10-15 08:10:37 +02:00
irq.c Rework of the X86 irq stack handling: 2021-02-24 16:32:23 -08:00
jump_label.c parisc: Add static branch and JUMP_LABEL feature 2019-05-06 00:10:03 +02:00
kexec.c parisc: add support for kexec_file_load() syscall 2019-09-08 15:41:46 +02:00
kexec_file.c parisc: add support for kexec_file_load() syscall 2019-09-08 15:41:46 +02:00
kgdb.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
kprobes.c parisc: kprobes: Use generic kretprobe trampoline handler 2020-09-08 11:52:33 +02:00
Makefile parisc: fix compilation when KEXEC=n and KEXEC_FILE=y 2019-12-15 21:05:38 +01:00
module.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
pa7300lc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pacache.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
parisc_ksyms.c parisc: Drop strnlen_user() in favour of generic version 2021-09-09 12:44:30 +02:00
patch.c parisc: add spinlock to patch function 2019-06-08 12:56:26 +02:00
pci-dma.c parisc: pci-dma: fix warning unused-function 2020-12-15 05:41:11 +01:00
pci.c parisc: Drop comments which are already in pci.h 2019-09-05 16:41:11 +02:00
pdc_chassis.c kernel.h: split out panic and oops helpers 2021-07-01 11:06:04 -07:00
pdc_cons.c tty: pdc_cons, free tty_driver upon failure 2021-07-27 12:17:21 +02:00
pdt.c parisc: Report bad pages as HardwareCorrupted 2020-07-28 11:19:17 +02:00
perf.c parisc/perf: open access for CAP_PERFMON privileged process 2020-04-16 12:19:08 -03:00
perf_asm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
perf_images.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
process.c isystem: trim/fixup stdarg.h and other headers 2021-08-19 09:02:55 +09:00
processor.c parisc: Drop loops_per_jiffy from per_cpu struct 2020-11-11 14:57:30 +01:00
ptrace.c arch/parisc/kernel: remove duplicate include in ptrace 2021-03-04 09:12:29 +01:00
real2.S parisc: Fix and improve kernel stack unwinding 2018-08-13 09:54:17 +02:00
relocate_kernel.S parisc: add kexec syscall support 2019-09-08 15:37:04 +02:00
setup.c parisc: Mark sched_clock unstable only if clocks are not syncronized 2021-09-09 12:44:31 +02:00
signal.c Revert "parisc: Reduce sigreturn trampoline to 3 instructions" 2021-11-25 09:48:44 +01:00
signal32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
signal32.h Revert "parisc: Reduce sigreturn trampoline to 3 instructions" 2021-11-25 09:48:44 +01:00
smp.c parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling 2021-11-18 19:16:21 +01:00
stacktrace.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
sys_parisc.c parisc: Make user stack size configurable 2020-11-11 14:59:08 +01:00
sys_parisc32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall.S parisc: syscalls: switch to generic syscalltbl.sh 2021-04-27 09:43:56 +02:00
time.c parisc: Mark cr16 CPU clocksource unstable on all SMP machines 2021-12-08 09:04:55 +01:00
topology.c parisc: Add CPU topology support 2017-11-17 15:27:22 +01:00
traps.c trap: cleanup trap_init() 2021-09-08 11:50:27 -07:00
unaligned.c Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2019-07-08 21:48:15 -07:00
unwind.c parisc/unwind: fix unwinder when CONFIG_64BIT is enabled 2021-11-18 19:16:21 +01:00
vmlinux.lds.S Revert "parisc: Fix backtrace to always include init funtion names" 2021-12-01 09:04:41 +01:00