3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
4 select ARCH_USE_CMPXCHG_LOCKREF
5 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
6 select ARCH_WANT_OPTIONAL_GPIOLIB
7 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
8 select ARCH_WANT_FRAME_POINTERS
12 select CLONE_BACKWARDS
14 select CPU_PM if (SUSPEND || CPU_IDLE)
15 select GENERIC_CLOCKEVENTS
16 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
18 select GENERIC_IRQ_PROBE
19 select GENERIC_IRQ_SHOW
20 select GENERIC_SMP_IDLE_THREAD
21 select GENERIC_TIME_VSYSCALL
22 select HARDIRQS_SW_RESEND
23 select HAVE_ARCH_TRACEHOOK
24 select HAVE_DEBUG_BUGVERBOSE
25 select HAVE_DEBUG_KMEMLEAK
26 select HAVE_DMA_API_DEBUG
28 select HAVE_DMA_CONTIGUOUS
29 select HAVE_GENERIC_DMA_COHERENT
30 select HAVE_GENERIC_HARDIRQS
31 select HAVE_HW_BREAKPOINT if PERF_EVENTS
33 select HAVE_PERF_EVENTS
35 select MODULES_USE_ELF_RELA
38 select OF_EARLY_FLATTREE
39 select PERF_USE_VMALLOC
44 select SYSCTL_EXCEPTION_TRACE
46 ARM 64-bit (AArch64) Linux support.
51 config ARCH_PHYS_ADDR_T_64BIT
60 config STACKTRACE_SUPPORT
63 config LOCKDEP_SUPPORT
66 config TRACE_IRQFLAGS_SUPPORT
69 config GENERIC_LOCKBREAK
71 depends on SMP && PREEMPT
73 config RWSEM_GENERIC_SPINLOCK
76 config GENERIC_HWEIGHT
82 config GENERIC_CALIBRATE_DELAY
88 config ARCH_DMA_ADDR_T_64BIT
91 config NEED_DMA_MAP_STATE
94 config NEED_SG_DMA_LENGTH
103 source "init/Kconfig"
105 source "kernel/Kconfig.freezer"
107 menu "Platform selection"
110 bool "ARMv8 software model (Versatile Express)"
111 select ARCH_REQUIRE_GPIOLIB
112 select COMMON_CLK_VERSATILE
113 select POWER_RESET_VEXPRESS
114 select VEXPRESS_CONFIG
116 This enables support for the ARMv8 software model (Versatile
128 menu "Kernel Features"
130 config ARM64_64K_PAGES
131 bool "Enable 64KB pages support"
133 This feature enables 64KB pages support (4KB by default)
134 allowing only two levels of page tables and faster TLB
135 look-up. AArch32 emulation is not available when this feature
138 config CPU_BIG_ENDIAN
139 bool "Build big-endian kernel"
141 Say Y if you plan on running a kernel in big-endian mode.
144 bool "Symmetric Multi-Processing"
145 select USE_GENERIC_SMP_HELPERS
147 This enables support for systems with more than one CPU. If
148 you say N here, the kernel will run on single and
149 multiprocessor machines, but will use only one CPU of a
150 multiprocessor machine. If you say Y here, the kernel will run
151 on many, but not all, single processor machines. On a single
152 processor machine, the kernel will run faster if you say N
155 If you don't know what to do here, say N.
158 bool "Multi-core scheduler support"
161 Multi-core scheduler support improves the CPU scheduler's decision
162 making when dealing with multi-core CPU chips at a cost of slightly
163 increased overhead in some places. If unsure say N here.
166 bool "SMT scheduler support"
169 Improves the CPU scheduler's decision making when dealing with
170 MultiThreading at a cost of slightly increased overhead in some
171 places. If unsure say N here.
173 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
174 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
176 Disables scheduler load-balancing at CPU sched domain level.
179 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
180 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
182 Experimental scheduler optimizations for heterogeneous platforms.
183 Attempts to introspectively select task affinity to optimize power
184 and performance. Basic support for multiple (>2) cpu types is in place,
185 but it has only been tested with two types of cpus.
186 There is currently no support for migration of task groups, hence
187 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
188 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
190 config SCHED_HMP_PRIO_FILTER
191 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
194 Enables task priority based HMP migration filter. Any task with
195 a NICE value above the threshold will always be on low-power cpus
196 with less compute capacity.
198 config SCHED_HMP_PRIO_FILTER_VAL
199 int "NICE priority threshold"
201 depends on SCHED_HMP_PRIO_FILTER
203 config HMP_FAST_CPU_MASK
204 string "HMP scheduler fast CPU mask"
207 Leave empty to use device tree information.
208 Specify the cpuids of the fast CPUs in the system as a list string,
209 e.g. cpuid 0+1 should be specified as 0-1.
211 config HMP_SLOW_CPU_MASK
212 string "HMP scheduler slow CPU mask"
215 Leave empty to use device tree information.
216 Specify the cpuids of the slow CPUs in the system as a list string,
217 e.g. cpuid 0+1 should be specified as 0-1.
219 config HMP_VARIABLE_SCALE
220 bool "Allows changing the load tracking scale through sysfs"
223 When turned on, this option exports the thresholds and load average
224 period value for the load tracking patches through sysfs.
225 The values can be modified to change the rate of load accumulation
226 and the thresholds used for HMP migration.
227 The load_avg_period_ms is the time in ms to reach a load average of
228 0.5 for an idle task of 0 load average ratio that start a busy loop.
229 The up_threshold and down_threshold is the value to go to a faster
230 CPU or to go back to a slower cpu.
231 The {up,down}_threshold are devided by 1024 before being compared
233 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
234 a running task with a load of 0 will be migrated to a bigger CPU after
235 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
237 This patch has the same behavior as changing the Y of the load
238 average computation to
239 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
240 but it remove intermadiate overflows in computation.
242 config HMP_FREQUENCY_INVARIANT_SCALE
243 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
244 depends on HMP_VARIABLE_SCALE && CPU_FREQ
246 Scales the current load contribution in line with the frequency
247 of the CPU that the task was executed on.
248 In this version, we use a simple linear scale derived from the
249 maximum frequency reported by CPUFreq.
250 Restricting tracked load to be scaled by the CPU's frequency
251 represents the consumption of possible compute capacity
252 (rather than consumption of actual instantaneous capacity as
253 normal) and allows the HMP migration's simple threshold
254 migration strategy to interact more predictably with CPUFreq's
255 asynchronous compute capacity changes.
257 config SCHED_HMP_LITTLE_PACKING
258 bool "Small task packing for HMP"
262 Allows the HMP Scheduler to pack small tasks into CPUs in the
264 Controlled by two sysfs files in sys/kernel/hmp.
265 packing_enable: 1 to enable, 0 to disable packing. Default 1.
266 packing_limit: runqueue load ratio where a RQ is considered
267 to be full. Default is NICE_0_LOAD * 9/8.
270 int "Maximum number of CPUs (2-32)"
276 bool "Support for hot-pluggable CPUs"
279 Say Y here to experiment with turning CPUs off and on. CPUs
280 can be controlled through /sys/devices/system/cpu.
282 source kernel/Kconfig.preempt
288 config ARCH_HAS_HOLES_MEMORYMODEL
289 def_bool y if SPARSEMEM
291 config ARCH_SPARSEMEM_ENABLE
293 select SPARSEMEM_VMEMMAP_ENABLE
295 config ARCH_SPARSEMEM_DEFAULT
296 def_bool ARCH_SPARSEMEM_ENABLE
298 config ARCH_SELECT_MEMORY_MODEL
299 def_bool ARCH_SPARSEMEM_ENABLE
301 config HAVE_ARCH_PFN_VALID
302 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
304 config HW_PERF_EVENTS
305 bool "Enable hardware performance counter support for perf events"
306 depends on PERF_EVENTS
309 Enable hardware performance counter support for perf events. If
310 disabled, perf events will use software events only.
312 config SYS_SUPPORTS_HUGETLBFS
315 config ARCH_WANT_GENERAL_HUGETLB
318 config ARCH_WANT_HUGE_PMD_SHARE
319 def_bool y if !ARM64_64K_PAGES
321 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
326 config FORCE_MAX_ZONEORDER
328 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
336 string "Default kernel command string"
339 Provide a set of default command-line options at build time by
340 entering them here. As a minimum, you should specify the the
341 root device (e.g. root=/dev/nfs).
344 bool "Always use the default kernel command string"
346 Always use the default kernel command string, even if the boot
347 loader passes other arguments to the kernel.
348 This is useful if you cannot or don't want to change the
349 command-line options your boot loader passes to the kernel.
353 menu "Userspace binary formats"
355 source "fs/Kconfig.binfmt"
358 bool "Kernel support for 32-bit EL0"
359 depends on !ARM64_64K_PAGES
360 select COMPAT_BINFMT_ELF
362 select OLD_SIGSUSPEND3
363 select COMPAT_OLD_SIGACTION
365 This option enables support for a 32-bit EL0 running under a 64-bit
366 kernel at EL1. AArch32-specific components such as system calls,
367 the user helper functions, VFP support and the ptrace interface are
368 handled appropriately by the kernel.
370 If you want to execute 32-bit userspace applications, say Y.
372 config SYSVIPC_COMPAT
374 depends on COMPAT && SYSVIPC
378 menu "Power management options"
380 source "kernel/power/Kconfig"
382 source "drivers/cpufreq/Kconfig"
383 config ARCH_SUSPEND_POSSIBLE
386 config ARM64_CPU_SUSPEND
391 menu "CPU Power Management"
393 source "drivers/cpuidle/Kconfig"
399 source "drivers/Kconfig"
403 source "arch/arm64/Kconfig.debug"
405 source "security/Kconfig"
407 source "crypto/Kconfig"