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6a942f5780
linux/arch/s390/include/asm
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Valentin Schneider 6a942f5780 s390: preempt: Fix preempt_count initialization 
S390's init_idle_preempt_count(p, cpu) doesn't actually let us initialize the
preempt_count of the requested CPU's idle task: it unconditionally writes
to the current CPU's. This clearly conflicts with idle_threads_init(),
which intends to initialize *all* the idle tasks, including their
preempt_count (or their CPU's, if the arch uses a per-CPU preempt_count).

Unfortunately, it seems the way s390 does things doesn't let us initialize
every possible CPU's preempt_count early on, as the pages where this
resides are only allocated when a CPU is brought up and are freed when it
is brought down.

Let the arch-specific code set a CPU's preempt_count when its lowcore is
allocated, and turn init_idle_preempt_count() into an empty stub.

Fixes: f1a0a376ca ("sched/core: Initialize the idle task with preemption disabled")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20210707163338.1623014-1-valentin.schneider@arm.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-07-08 22:12:18 +02:00
..
fpu s390: convert to generic entry 2021-01-19 12:29:26 +01:00
trace
vdso s390/vdso: add minimal compat vdso 2021-07-08 15:37:28 +02:00
airq.h s390/airq: use DMA memory for adapter interrupts 2019-06-15 12:25:05 +02:00
alternative-asm.h s390: add assembler macros for CPU alternatives 2018-03-28 08:38:27 +02:00
alternative.h s390/alternatives: add alternative_input() / alternative_io() 2021-02-09 15:57:06 +01:00
ap.h s390/ap: get rid of register asm in ap_dqap() 2021-07-08 22:12:17 +02:00
appldata.h s390/appldata: pass parameter list pointer to appldata_asm 2018-10-09 11:20:50 +02:00
archrandom.h s390/crypto: add arch_get_random_long() support 2020-12-10 21:02:08 +01:00
asm-const.h s390/kernel: unify EX_TABLE* implementations 2020-07-20 10:55:45 +02:00
asm-prototypes.h
atomic_ops.h s390/atomic,cmpxchg: make constraints work with old compilers 2021-04-15 17:47:42 +02:00
atomic.h locking/atomic: make ARCH_ATOMIC a Kconfig symbol 2021-05-26 13:20:49 +02:00
barrier.h
bitops.h s390/bitops: use register pair instead of register asm 2021-06-18 16:41:21 +02:00
boot_data.h s390/ipl: read IPL report at early boot 2019-04-26 12:34:05 +02:00
bug.h printk: Make linux/printk.h self-contained 2020-07-27 17:46:24 +09:00
bugs.h
cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
ccwdev.h s390/cio: remove duplicate struct ccw1 declaration 2021-04-05 11:30:57 +02:00
ccwgroup.h s390/ccwgroup: use BUS_NOTIFY_UNBOUND_DRIVER to trigger ungrouping 2021-06-07 17:07:00 +02:00
checksum.h s390/checksum: use register pair instead of register asm 2021-06-18 16:41:21 +02:00
chpid.h s390/cio: rename struct channel_path_desc 2018-03-26 16:13:11 +02:00
chsc.h s390/cio: Add new Operation Code OC3 to PNSO 2020-09-15 13:21:46 -07:00
cio.h s390/cio: add tpi.h header file 2021-06-07 17:07:01 +02:00
clocksource.h s390: convert to GENERIC_VDSO 2020-08-26 18:47:21 +02:00
clp.h s390/pci: Implement ioremap_wc/prot() with MIO 2020-09-14 10:30:07 +02:00
cmb.h
cmpxchg.h s390/cmpxchg: use register pair instead of register asm 2021-06-28 11:18:28 +02:00
compat.h compat: lift compat_s64 and compat_u64 to <asm-generic/compat.h> 2020-09-17 13:00:46 -04:00
cpacf.h s390: mark __cpacf_query() as __always_inline 2019-10-04 16:37:33 +02:00
cpcmd.h
cpu_mcf.h s390/cpumf: Allow concurrent access for CPU Measurement Counter Facility 2021-07-05 12:44:23 +02:00
cpu_mf-insn.h s390/cpu_mf: add store cpu counter multiple instruction support 2019-02-22 09:19:52 +01:00
cpu_mf.h s390/cpum_sf: Replace function name in debug statements 2019-11-30 10:52:46 +01:00
cpu.h
cpufeature.h
cputime.h s390: convert to generic entry 2021-01-19 12:29:26 +01:00
crw.h
css_chars.h s390/cio: Add new Operation Code OC3 to PNSO 2020-09-15 13:21:46 -07:00
ctl_reg.h s390/mcck: move register validation to C code 2021-07-05 12:44:23 +02:00
current.h
debug.h s390/debug: debug feature version 3 2020-08-11 18:16:43 +02:00
delay.h s390/delay: remove udelay_simple() 2020-12-16 14:55:49 +01:00
diag.h s390/setup: diag 318: refactor struct 2020-06-23 09:16:48 +02:00
dis.h
dma.h
dwarf.h
eadm.h
ebcdic.h s390: fix clang -Wpointer-sign warnigns in boot code 2019-05-03 17:17:58 +02:00
elf.h s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART 2021-07-08 22:12:17 +02:00
entry-common.h s390/signal: remove sigreturn on stack 2021-07-08 22:12:17 +02:00
exec.h
extable.h s390/kernel: expand exception table logic to allow new handling options 2020-07-20 10:55:50 +02:00
extmem.h
facility.h s390/facility: get rid of register asm 2021-06-18 16:41:23 +02:00
fcx.h
ftrace.h s390/ftrace: assume -mhotpatch or -mrecord-mcount always available 2020-11-20 19:19:11 +01:00
futex.h s390/mm: remove set_fs / rework address space handling 2020-11-23 12:01:12 +01:00
gmap.h s390: remove orphaned function declarations 2020-09-30 12:09:54 +02:00
hardirq.h softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig 2021-02-10 23:34:16 +01:00
hugetlb.h mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
hw_irq.h s390/irq: make init_ext_interrupts static 2020-03-11 14:18:44 +01:00
idals.h s390/idal: use struct_size() in kmalloc() 2019-06-04 15:03:18 +02:00
idle.h s390/time,idle: get rid of unsigned long long 2021-03-08 10:46:27 +01:00
io.h mm: remove xlate_dev_kmem_ptr() 2021-05-07 00:26:34 -07:00
ipl.h s390/nvme: support firmware-assisted dump to NVMe disks 2020-10-02 14:40:48 +02:00
irq_work.h s390/smp: implement arch_irq_work_raise() 2021-02-24 00:31:22 +01:00
irq.h s390/pci: gather statistics for floating vs directed irqs 2019-04-29 10:47:01 +02:00
irqflags.h s390/irqflags: always inline arch irqflags functions 2021-06-18 16:41:19 +02:00
isc.h KVM: s390: add gib_alert_irq_handler() 2019-02-05 14:29:23 +01:00
itcw.h
jump_label.h s390/jump_label: use "i" constraint for clang 2020-01-22 13:05:35 +01:00
kasan.h s390: setup kernel memory layout early 2021-06-18 16:41:19 +02:00
Kbuild local64.h: make <asm/local64.h> mandatory 2020-12-29 15:36:49 -08:00
kdebug.h
kexec.h s390/kernel: build a relocatable kernel 2019-04-29 10:47:10 +02:00
kprobes.h s390: support KPROBES_ON_FTRACE 2020-01-30 13:07:55 +01:00
kvm_host.h KVM: stats: Separate generic stats from architecture specific ones 2021-06-24 11:47:56 -04:00
kvm_para.h KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED 2018-03-06 18:40:44 +01:00
linkage.h s390/linkage: increase asm symbols alignment to 16 2021-07-08 22:12:18 +02:00
livepatch.h livepatch: Use the default ftrace_ops instead of REGS when ARGS is available 2020-11-13 12:15:28 -05:00
lowcore.h s390/lowcore: remove superfluous __packed annotations 2021-06-07 17:07:01 +02:00
mem_detect.h s390/mem_detect: provide single get_mem_detect_end 2019-08-26 12:51:18 +02:00
mem_encrypt.h s390/mm: Remove sev_active() function 2019-08-09 22:52:11 +10:00
mmu_context.h s390/mm: ensure switch_mm() is executed with interrupts disabled 2021-06-07 17:06:59 +02:00
mmu.h s390 updates for the 5.7 merge window 2020-04-04 09:45:50 -07:00
mmzone.h
module.h
nmi.h s390/mcck: keep machine check interruption codes sorted 2021-07-05 12:44:23 +02:00
nospec-branch.h s390: correct nospec auto detection init order 2018-04-11 17:46:00 +02:00
nospec-insn.h s390/nospec: rename assembler generated expoline thunks 2019-05-02 13:54:11 +02:00
numa.h s390/mm: remove fake numa support 2020-02-27 16:02:21 +01:00
os_info.h
page-states.h
page.h s390 updates for the 5.14 merge window 2021-07-04 12:17:38 -07:00
pci_clp.h s390/pci: Implement ioremap_wc/prot() with MIO 2020-09-14 10:30:07 +02:00
pci_debug.h
pci_dma.h s390/pci: remove unused functions 2020-06-29 16:32:09 +02:00
pci_insn.h s390: fix setting of mio addressing control 2019-07-11 20:40:02 +02:00
pci_io.h s390/pci: Fix s390_mmio_read/write with MIO 2020-05-14 23:21:37 +02:00
pci.h s390/pci: add zpci_set_irq()/zpci_clear_irq() 2021-06-28 11:18:28 +02:00
percpu.h s390/cmpxchg: use register pair instead of register asm 2021-06-28 11:18:28 +02:00
perf_event.h s390: implement perf_arch_fetch_caller_regs 2019-11-30 10:52:44 +01:00
pgalloc.h mm/thp: define default pmd_pgtable() 2021-07-01 11:06:03 -07:00
pgtable.h s390 updates for the 5.14 merge window 2021-07-04 12:17:38 -07:00
pkey.h s390/pkey: pkey cleanup: narrow in-kernel API, fix some variable types 2019-08-21 12:58:53 +02:00
pnet.h s390/net: move pnet constants 2019-02-07 18:06:18 -08:00
preempt.h s390: preempt: Fix preempt_count initialization 2021-07-08 22:12:18 +02:00
processor.h s390/processor: always inline stap() and __load_psw_mask() 2021-06-18 16:41:19 +02:00
ptdump.h s390: add ARCH_HAS_DEBUG_WX support 2020-09-14 11:38:35 +02:00
ptrace.h s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART 2021-07-08 22:12:17 +02:00
purgatory.h s390/purgatory: Remove duplicate variable definitions 2018-07-06 08:47:51 +02:00
qdio.h s390/qeth: remove QAOB's pointer to its TX buffer 2021-06-11 12:49:15 -07:00
runtime_instr.h
schid.h
sclp.h s390/sclp: provide extended sccb support 2020-11-18 12:16:02 +01:00
scsw.h s390: Simplify the calculation of variables 2021-02-09 15:57:04 +01:00
seccomp.h s390: Enable seccomp architecture tracking 2020-11-20 11:16:35 -08:00
sections.h s390: correct __bootdata / __bootdata_preserved macros 2020-10-26 14:18:01 +01:00
serial.h
set_memory.h s390/mm,ptdump: hold cpa mutex while walking for kernel page table dump 2020-09-14 11:38:34 +02:00
setup.h s390/boot: replace magic string check with a bootdata flag 2021-07-05 12:44:23 +02:00
shmparam.h
signal.h
sigp.h s390/sigp: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
smp.h KVM: s390: diag9c (directed yield) forwarding 2021-03-09 10:16:26 +01:00
softirq_stack.h s390/softirq: use call_on_stack() macro 2021-07-08 22:12:18 +02:00
sparsemem.h
spinlock_types.h s390/spinlock: remove align attribute from arch_spinlock_t 2021-03-28 20:23:54 +02:00
spinlock.h s390/spinlock: use R constraint in inline assembly 2021-04-12 12:46:43 +02:00
stacktrace.h s390: rename CALL_ON_STACK_NORETURN() to call_on_stack_noreturn() 2021-07-08 22:12:18 +02:00
stp.h s390/stp: add support for leap seconds 2020-09-26 15:51:21 +02:00
string.h s390/string: get rid of register asm 2021-06-28 11:18:28 +02:00
switch_to.h
syscall_wrapper.h s390: pass struct pt_regs instead of registers to syscalls 2021-01-19 12:29:27 +01:00
syscall.h s390: convert to generic entry 2021-01-19 12:29:26 +01:00
sysinfo.h
termios.h
thread_info.h s390/thread_info.h: fix task_struct declaration warning 2021-02-09 15:57:04 +01:00
timex.h s390/timex: get rid of register asm 2021-06-28 11:18:28 +02:00
tlb.h s390/tlb: make cleared_pXs flags consistent with generic code 2021-01-19 12:29:25 +01:00
tlbflush.h s390: remove orphaned function declarations 2020-09-30 12:09:54 +02:00
topology.h s390/numa: set node distance to LOCAL_DISTANCE 2020-08-11 18:16:35 +02:00
tpi.h s390: add struct tpi_info to struct pt_regs 2021-06-07 17:07:01 +02:00
types.h s390: introduce register pair union 2021-06-18 16:41:21 +02:00
uaccess.h s390/uaccess: get rid of register asm 2021-06-18 16:41:23 +02:00
unistd.h s390: wire up clone3 system call 2019-07-23 10:45:53 +02:00
unwind.h s390/unwind: start unwinding from reliable state 2019-11-30 10:52:48 +01:00
uprobes.h
user.h
uv.h s390: mm: Fix secure storage access exception handling 2021-07-05 12:44:23 +02:00
vdso.h s390/vdso: add minimal compat vdso 2021-07-08 15:37:28 +02:00
vga.h
vmalloc.h mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h> 2019-12-10 10:12:55 +01:00
vmlinux.lds.h s390: introduce .boot.preserved.data section 2019-04-10 17:47:09 +02:00
vtime.h s390: convert to generic entry 2021-01-19 12:29:26 +01:00
vtimer.h s390: remove orphaned function declarations 2020-09-30 12:09:54 +02:00
vx-insn.h s390: add alignment hints to vector load and store 2019-02-07 11:57:10 +01:00
xor.h