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OpenCloudOS-Kernel/arch/powerpc/platforms/pseries
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Valentin Schneider 2c669ef697 powerpc/preempt: Don't touch the idle task's preempt_count during hotplug 
Powerpc currently resets a CPU's idle task preempt_count to 0 before
said task starts executing the secondary startup routine (and becomes an
idle task proper).

This conflicts with commit f1a0a376ca ("sched/core: Initialize the
idle task with preemption disabled").

which initializes all of the idle tasks' preempt_count to
PREEMPT_DISABLED during smp_init(). Note that this was superfluous
before said commit, as back then the hotplug machinery would invoke
init_idle() via idle_thread_get(), which would have already reset the
CPU's idle task's preempt_count to PREEMPT_ENABLED.

Get rid of this preempt_count write.

Fixes: f1a0a376ca ("sched/core: Initialize the idle task with preemption disabled")
Reported-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210707183831.2106509-1-valentin.schneider@arm.com
 		2021-07-08 23:38:10 +10:00
..
Kconfig powerpc/pseries: Implement paravirt qspinlocks for SPLPAR 2020-07-27 00:01:29 +10:00
Makefile powerpc/pseries/vas: Integrate API with open/close windows 2021-06-20 21:58:57 +10:00
cmm.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
dlpar.c powerpc/pseries/dlpar: use rtas_get_sensor() 2021-06-25 14:47:20 +10:00
dtl.c powerpc64: Break asm/percpu.h vs spinlock_types.h dependency 2020-07-10 12:00:01 +02:00
eeh_pseries.c powerpc/pseries/eeh: Make pseries_send_allow_unfreeze() static 2021-01-30 11:39:31 +11:00
event_sources.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
firmware.c powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE 2020-07-29 21:09:37 +10:00
hotplug-cpu.c powerpc/pseries: Stop calling printk in rtas_stop_self() 2021-04-20 14:22:24 +10:00
hotplug-memory.c powerpc/pseries: fail quicker in dlpar_memory_add_by_ic() 2021-06-25 00:07:09 +10:00
hvCall.S powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
hvCall_inst.c powerpc/pseries: Make symbol '__pcpu_scope_hcall_stats' static 2021-04-14 23:04:17 +10:00
hvconsole.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
hvcserver.c powerpc: Use fallthrough pseudo-keyword 2020-07-29 21:09:37 +10:00
ibmebus.c powerpc: Add missing linux/{of.h,irqdomain.h} include directives 2021-06-10 13:09:16 +01:00
io_event_irq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
iommu.c powerpc/iommu: Do not immediately panic when failed IOMMU table allocation 2021-04-23 01:38:04 +10:00
kexec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
lpar.c powerpc/pseries: warn if recursing into the hcall tracing code 2021-05-12 11:07:39 +10:00
lparcfg.c powerpc/pseries: export LPAR security flavor in lparcfg 2021-03-26 23:19:41 +11:00
mobility.c powerpc/pseries/mobility: handle premature return from H_JOIN 2021-03-23 09:25:12 +11:00
msi.c powerpc/pseries: Don't enforce MSI affinity with kdump 2021-03-01 12:33:31 +11:00
nvram.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
of_helpers.c powerpc/pseries: Fix of_read_drc_info_cell() to point at next record 2020-03-25 12:06:43 +11:00
of_helpers.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
papr_scm.c powerpc/papr_scm: trivial: fix typo in a comment 2021-06-25 14:47:19 +10:00
pci.c powerpc/powernv: remove the nvlink support 2021-05-02 23:35:32 +10:00
pci_dlpar.c powerpc/pseries: extract host bridge from pci_bus prior to bus removal 2021-04-16 23:58:04 +10:00
pmem.c powerpc/pseries/pmem: Make symbol 'drc_pmem_match' static 2021-04-14 23:04:17 +10:00
power.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
pseries.h powerpc/pseries: Introduce dlpar_unisolate_drc() 2021-04-20 14:22:23 +10:00
pseries_energy.c powerpc/pseries: Fix drc-info mappings of logical cpus to drc-index 2019-11-13 16:57:57 +11:00
ras.c powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
reconfig.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rng.c powerpc/pseries: Fix missing of_node_put() in rng_init() 2020-08-25 01:31:31 +10:00
rtas-fadump.c powerpc/fadump: make symbol 'rtas_fadump_set_regval' static 2021-04-14 23:04:19 +10:00
rtas-fadump.h powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
scanlog.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
setup.c powerpc/pesries: Get STF barrier requirement from H_GET_CPU_CHARACTERISTICS 2021-06-21 21:13:19 +10:00
smp.c powerpc/preempt: Don't touch the idle task's preempt_count during hotplug 2021-07-08 23:38:10 +10:00
suspend.c powerpc/pseries/hibernation: remove prepare_late() callback 2020-12-08 21:41:02 +11:00
svm.c powerpc/svm: stop using io_tlb_start 2021-03-17 00:13:52 +00:00
vas.c powerpc/pseries/vas: Include irqdomain.h 2021-06-25 14:53:47 +10:00
vas.h powerpc/pseries/vas: Define VAS/NXGZIP hcalls and structs 2021-06-20 21:58:56 +10:00
vio.c powerpc/pseries: Add shutdown() to vio_driver and vio_bus 2021-04-20 14:22:24 +10:00
vphn.c powerpc/vphn: Check for error from hcall_vphn 2020-03-04 22:44:30 +11:00