Cristian Marussi d0bab0c39e arm64: smp: fix smp_send_stop() behaviour ... On a system with only one CPU online, when another one CPU panics while starting-up, smp_send_stop() will fail to send any STOP message to the other already online core, resulting in a system still responsive and alive at the end of the panic procedure. [ 186.700083] CPU3: shutdown [ 187.075462] CPU2: shutdown [ 187.162869] CPU1: shutdown [ 188.689998] ------------[ cut here ]------------ [ 188.691645] kernel BUG at arch/arm64/kernel/cpufeature.c:886! [ 188.692079] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 188.692444] Modules linked in: [ 188.693031] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.6.0-rc4-00001-g338d25c35a98 #104 [ 188.693175] Hardware name: Foundation-v8A (DT) [ 188.693492] pstate: 200001c5 (nzCv dAIF -PAN -UAO) [ 188.694183] pc : has_cpuid_feature+0xf0/0x348 [ 188.694311] lr : verify_local_elf_hwcaps+0x84/0xe8 [ 188.694410] sp : ffff800011b1bf60 [ 188.694536] x29: ffff800011b1bf60 x28: 0000000000000000 [ 188.694707] x27: 0000000000000000 x26: 0000000000000000 [ 188.694801] x25: 0000000000000000 x24: ffff80001189a25c [ 188.694905] x23: 0000000000000000 x22: 0000000000000000 [ 188.694996] x21: ffff8000114aa018 x20: ffff800011156a38 [ 188.695089] x19: ffff800010c944a0 x18: 0000000000000004 [ 188.695187] x17: 0000000000000000 x16: 0000000000000000 [ 188.695280] x15: 0000249dbde5431e x14: 0262cbe497efa1fa [ 188.695371] x13: 0000000000000002 x12: 0000000000002592 [ 188.695472] x11: 0000000000000080 x10: 00400032b5503510 [ 188.695572] x9 : 0000000000000000 x8 : ffff800010c80204 [ 188.695659] x7 : 00000000410fd0f0 x6 : 0000000000000001 [ 188.695750] x5 : 00000000410fd0f0 x4 : 0000000000000000 [ 188.695836] x3 : 0000000000000000 x2 : ffff8000100939d8 [ 188.695919] x1 : 0000000000180420 x0 : 0000000000180480 [ 188.696253] Call trace: [ 188.696410] has_cpuid_feature+0xf0/0x348 [ 188.696504] verify_local_elf_hwcaps+0x84/0xe8 [ 188.696591] check_local_cpu_capabilities+0x44/0x128 [ 188.696666] secondary_start_kernel+0xf4/0x188 [ 188.697150] Code: 52805001 72a00301 6b01001f 54000ec0 (d4210000) [ 188.698639] ---[ end trace 3f12ca47652f7b72 ]--- [ 188.699160] Kernel panic - not syncing: Attempted to kill the idle task! [ 188.699546] Kernel Offset: disabled [ 188.699828] CPU features: 0x00004,20c02008 [ 188.700012] Memory Limit: none [ 188.700538] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- [root@arch ~]# echo Helo Helo [root@arch ~]# cat /proc/cpuinfo | grep proce processor : 0 Make smp_send_stop() account also for the online status of the calling CPU while evaluating how many CPUs are effectively online: this way, the right number of STOPs is sent, so enforcing a proper freeze of the system at the end of panic even under the above conditions. Fixes: 08e875c16a ("arm64: SMP support") Reported-by: Dave Martin <Dave.Martin@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Will Deacon <will@kernel.org>		2020-03-17 22:51:18 +00:00
..
probes	arm64: remove __exception annotations	2019-10-28 11:22:38 +00:00
vdso	arm64: vdso: Remove stale files from old assembly implementation	2019-10-07 11:07:16 +01:00
vdso32	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
.gitignore
acpi_numa.c	acpi: Create subtable parsing infrastructure	2019-04-04 18:41:12 +02:00
acpi_parking_protocol.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
acpi.c	arm64: acpi: fix DAIF manipulation with pNMI	2020-01-22 14:41:22 +00:00
alternative.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
armv8_deprecated.c	arm64: armv8_deprecated: update the comments of armv8_deprecated_init()	2020-01-08 17:29:41 +00:00
asm-offsets.c	arm64: asm-offsets: add S_FP	2019-11-06 14:17:34 +00:00
cacheinfo.c	arm64 updates for 5.3:	2019-07-08 09:54:55 -07:00
cpu_errata.c	Merge branch 'for-next/errata' into for-next/core	2020-01-22 11:35:05 +00:00
cpu_ops.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
cpu-reset.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpu-reset.S	arm64: kernel: avoid x18 in __cpu_soft_restart	2020-01-16 17:32:56 +00:00
cpufeature.c	Merge branch 'for-next/rng' into for-next/core	2020-01-22 11:38:53 +00:00
cpuidle.c	PSCI: cpuidle: Refactor CPU suspend power_state parameter handling	2019-08-09 17:51:39 +01:00
cpuinfo.c	Merge branch 'for-next/rng' into for-next/core	2020-01-22 11:38:53 +00:00
crash_core.c	arm64: kernel: arch_crash_save_vmcoreinfo() should depend on CONFIG_CRASH_CORE	2018-09-11 11:08:49 +01:00
crash_dump.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
debug-monitors.c	arm64: Remove unneeded rcu_read_lock from debug handlers	2019-08-01 15:00:27 +01:00
efi-entry.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
efi-header.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
efi-rt-wrapper.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
efi.c	mm/pgtable: drop pgtable_t variable from pte_fn_t functions	2019-07-12 11:05:46 -07:00
entry-common.c	arm64: entry: cleanup el0 svc handler naming	2020-01-17 13:22:14 +00:00
entry-fpsimd.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
entry-ftrace.S	arm64: ftrace: fix ifdeffery	2019-12-06 13:25:14 +00:00
entry.S	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-01-28 10:07:09 -08:00
fpsimd.c	arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag cleanly	2020-01-14 17:11:53 +00:00
ftrace.c	arm64: ftrace: minimize ifdeffery	2019-11-06 14:17:36 +00:00
head.S	Merge branches 'for-next/52-bit-kva', 'for-next/cpu-topology', 'for-next/error-injection', 'for-next/perf', 'for-next/psci-cpuidle', 'for-next/rng', 'for-next/smpboot', 'for-next/tbi' and 'for-next/tlbi' into for-next/core	2019-08-30 12:46:12 +01:00
hibernate-asm.S	arm64: mm: Logic to make offset_ttbr1 conditional	2019-08-09 11:17:24 +01:00
hibernate.c	arm64: hibernate: add trans_pgd public functions	2020-01-08 16:55:12 +00:00
hw_breakpoint.c	Printk changes for 5.5	2019-11-25 19:40:40 -08:00
hyp-stub.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
image-vars.h	arm64/efi: Move variable assignments after SECTIONS	2019-08-14 17:18:15 +01:00
image.h	arm64/efi: Move variable assignments after SECTIONS	2019-08-14 17:18:15 +01:00
insn.c	arm64: insn: consistently handle exit text	2019-12-04 11:32:20 +00:00
io.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
irq.c	arm64 updates for 5.3:	2019-07-08 09:54:55 -07:00
jump_label.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
kaslr.c	arm64: Fix CONFIG_ARCH_RANDOM=n build	2020-02-11 09:47:01 +00:00
kexec_image.c	arm64: kexec_file: add crash dump support	2020-01-08 17:05:23 +00:00
kgdb.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
kuser32.S	docs: arm: convert docs to ReST and rename to *.rst	2019-07-15 09:20:24 -03:00
machine_kexec_file.c	arm64: kexec_file: add crash dump support	2020-01-08 17:05:23 +00:00
machine_kexec.c	Revert "arm64: kexec: make dtb_mem always enabled"	2020-01-10 16:00:50 +00:00
Makefile	arm64: entry: convert el1_sync to C	2019-10-28 11:22:47 +00:00
module-plts.c	arm64: implement ftrace with regs	2019-11-06 14:17:35 +00:00
module.c	arm64: implement ftrace with regs	2019-11-06 14:17:35 +00:00
module.lds	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
paravirt.c	arm64: Retrieve stolen time as paravirtualized guest	2019-10-21 19:20:31 +01:00
pci.c	pci-v5.3-changes	2019-07-15 20:44:49 -07:00
perf_callchain.c	arm64: stacktrace: Factor out backtrace initialisation	2019-07-22 11:44:08 +01:00
perf_event.c	arm64: perf: Simplify the ARMv8 PMUv3 event attributes	2019-11-01 14:51:19 +00:00
perf_regs.c	compat: Move compat_timespec/ timeval to compat_time.h	2018-04-19 13:29:54 +02:00
pointer_auth.c	arm64: ptr auth: Move per-thread keys from thread_info to thread_struct	2018-12-13 16:42:47 +00:00
process.c	arm64: ssbs: Fix context-switch when SSBS is present on all CPUs	2020-02-10 11:29:02 +00:00
psci.c	arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill()	2019-10-25 16:29:11 +01:00
ptrace.c	arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations	2020-01-14 17:11:39 +00:00
reloc_test_core.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
reloc_test_syms.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
relocate_kernel.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
return_address.c	arm64: unwind: Prohibit probing on return_address()	2019-08-01 15:00:26 +01:00
sdei.c	firmware: arm_sdei: use common SMCCC_CONDUIT_*	2019-10-14 10:55:14 +01:00
setup.c	TTY/Serial driver updates for 5.6-rc1	2020-01-29 10:13:27 -08:00
signal32.c	arm64: signal: nofpsimd: Handle fp/simd context for signal frames	2020-01-14 17:11:46 +00:00
signal.c	arm64: signal: nofpsimd: Handle fp/simd context for signal frames	2020-01-14 17:11:46 +00:00
sigreturn32.S	arm64: compat: Split kuser32	2019-04-23 18:01:57 +01:00
sleep.S	arm64: kernel: use aff3 instead of aff2 in comment	2019-06-04 14:51:01 +01:00
smccc-call.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174	2019-05-30 11:26:41 -07:00
smp_spin_table.c	arm64: prefer __section from compiler_attributes.h	2019-08-13 18:32:15 +01:00
smp.c	arm64: smp: fix smp_send_stop() behaviour	2020-03-17 22:51:18 +00:00
ssbd.c	Return ENODEV when the selected speculation misfeature is unsupported	2020-01-08 17:27:41 +00:00
stacktrace.c	arm64: unwind: Prohibit probing on return_address()	2019-08-01 15:00:26 +01:00
suspend.c	arm64: mm: Support Common Not Private translations	2018-09-18 12:02:27 +01:00
sys32.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 452	2019-06-19 17:09:08 +02:00
sys_compat.c	arm64: Silence clang warning on mismatched value/register sizes	2019-10-28 09:13:21 +00:00
sys.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
syscall.c	arm64: entry: cleanup el0 svc handler naming	2020-01-17 13:22:14 +00:00
time.c	arm64: time: Replace <linux/clk-provider.h> by <linux/of_clk.h>	2020-02-12 17:26:38 +00:00
topology.c	Merge tag 'common/for-v5.4-rc1/cpu-topology' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux into for-next/cpu-topology	2019-08-14 10:07:00 +01:00
trace-events-emulation.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
traps.c	sched/rt, arm64: Use CONFIG_PREEMPTION	2019-12-08 14:37:32 +01:00
vdso.c	arm64: compat: VDSO setup for compat layer	2019-06-22 21:21:08 +02:00
vmlinux.lds.S	arm64 updates for 5.5:	2019-12-06 14:18:01 -08:00