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e75118a7b5
linux/arch/arm64/kernel
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Suzuki K Poulose e75118a7b5 arm64: Honor nosmp kernel command line option 
Passing "nosmp" should boot the kernel with a single processor, without
provision to enable secondary CPUs even if they are present. "nosmp" is
implemented by setting maxcpus=0. At the moment we still mark the secondary
CPUs present even with nosmp, which allows the userspace to bring them
up. This patch corrects the smp_prepare_cpus() to honor the maxcpus == 0.

Commit 44dbcc93ab ("arm64: Fix behavior of maxcpus=N") fixed the
behavior for maxcpus >= 1, but broke maxcpus = 0.

Fixes: 44dbcc93ab ("arm64: Fix behavior of maxcpus=N")
Cc: <stable@vger.kernel.org> # 4.7+
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
[catalin.marinas@arm.com: updated code comment]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-07-21 16:48:37 +01:00
..
vdso arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
.gitignore
acpi_parking_protocol.c arm64: kernel: acpi: fix ioremap in ACPI parking protocol cpu_postboot 2016-02-26 15:39:52 +00:00
acpi.c arm64: acpi: add acpi=on cmdline option to prefer ACPI boot over DT 2016-04-26 14:37:41 +01:00
alternative.c arm64: mm: fold alternatives into .init 2015-12-10 17:36:08 +00:00
arm64ksyms.c arm64: kasan: instrument user memory access API 2016-06-21 15:37:18 +01:00
armv8_deprecated.c arm64: consolidate signal injection on emulation errors 2016-07-01 11:43:30 +01:00
asm-offsets.c arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
cacheinfo.c arm64: kernel: add support for cpu cache information 2015-01-15 11:55:07 +00:00
cpu_errata.c arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
cpu_ops.c arm64: kernel: implement ACPI parking protocol 2016-02-16 15:12:32 +00:00
cpu-reset.h arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpu-reset.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpufeature.c arm64: errata: Calling enable functions for CPU errata too 2016-07-01 11:30:28 +01:00
cpuidle.c arm64: cpuidle: make arm_cpuidle_suspend() a bit more efficient 2016-04-13 14:49:23 +01:00
cpuinfo.c arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs 2016-07-12 16:09:37 +01:00
debug-monitors.c arm64: debug: remove redundant spsr manipulation 2016-07-19 16:58:56 +01:00
efi-entry.S arm64: move early boot code to the .init segment 2016-04-14 18:11:30 +01:00
efi.c arm64: efi: avoid block mappings for unaligned UEFI memory regions 2016-07-01 11:56:26 +01:00
entry32.S arm64: entry32: remove pointless register assignment 2015-07-10 16:47:13 +01:00
entry-fpsimd.S arm64: fpsimd: fix a typo in fpsimd_save_partial_state ENDPROC 2014-07-31 11:42:42 +01:00
entry-ftrace.S arm64: ftrace: fix function_graph tracer panic 2015-10-02 11:12:56 +01:00
entry.S arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
fpsimd.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
ftrace.c arm64: ftrace: modify a stack frame in a safe way 2015-12-21 17:26:01 +00:00
head.S arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
hibernate-asm.S arm64: kernel: Add support for hibernate/suspend-to-disk 2016-04-28 13:36:22 +01:00
hibernate.c arm64: hibernate: Refuse to hibernate if the boot cpu is offline 2016-04-28 13:36:23 +01:00
hw_breakpoint.c arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
hyp-stub.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
image.h arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
insn.c arm64: insn: avoid virt_to_page() translations on core kernel symbols 2016-04-14 16:31:49 +01:00
io.c arm64: optimize memcpy_{from,to}io() and memset_io() 2014-11-06 17:25:27 +00:00
irq.c arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kaslr.c arm64: relocatable: deal with physically misaligned kernel images 2016-04-26 12:23:28 +01:00
kgdb.c arm64: kgdb: Match pstate size with gdbserver protocol 2016-06-16 19:20:51 +01:00
kuser32.S
machine_kexec.c arm64/kexec: Add pr_debug output 2016-06-27 16:31:26 +01:00
Makefile arm64: fix vdso-offsets.h dependency 2016-07-11 17:10:11 +01:00
module-plts.c arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
module.c arm64: add support for kernel ASLR 2016-02-24 14:57:27 +00:00
module.lds arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
paravirt.c arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.c arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
perf_callchain.c perf core: Add a 'nr' field to perf_event_callchain_context 2016-05-16 23:11:51 -03:00
perf_event.c arm64: perf: don't expose CHAIN event in sysfs 2016-04-25 15:05:24 +01:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
process.c exit_thread: remove empty bodies 2016-05-20 17:58:30 -07:00
psci.c ARM: 8511/1: ARM64: kernel: PSCI: move PSCI idle management code to drivers/firmware 2016-02-11 15:33:38 +00:00
ptrace.c arm64: Rework valid_user_regs 2016-03-02 15:49:28 +00:00
relocate_kernel.S arm64/kexec: Add core kexec support 2016-06-27 16:31:25 +01:00
return_address.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
setup.c arm64: mm: fix location of _etext 2016-06-27 18:21:27 +01:00
signal32.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
signal.c arm64: Rework valid_user_regs 2016-03-02 15:49:28 +00:00
sleep.S arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va 2016-04-28 12:05:46 +01:00
smccc-call.S ARM: 8480/2: arm64: add implementation for arm-smccc 2016-01-04 16:24:45 +00:00
smp_spin_table.c arm64: spin-table: add missing of_node_put() 2016-04-20 10:35:15 +01:00
smp.c arm64: Honor nosmp kernel command line option 2016-07-21 16:48:37 +01:00
stacktrace.c arm64: make irq_stack_ptr more robust 2016-02-12 15:53:51 +00:00
suspend.c arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va 2016-04-28 12:05:46 +01:00
sys32.c arm64: fix implementation of mmap2 compat syscall 2015-03-19 10:43:51 +00:00
sys_compat.c arm64: compat: align cacheflush syscall with arch/arm 2014-12-01 13:31:12 +00:00
sys.c arm64: compat: Check for AArch32 state 2016-04-20 12:22:42 +01:00
time.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
topology.c arm64: kernel: remove non-legit DT warnings when booting using ACPI 2015-07-27 11:08:41 +01:00
trace-events-emulation.h arm64: Trace emulation of AArch32 legacy instructions 2014-11-20 16:35:02 +00:00
traps.c arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
vdso.c arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
vmlinux.lds.S arm64: mm: fix location of _etext 2016-06-27 18:21:27 +01:00