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 BUILDTIME_EXTABLE_SORT
13 select CLONE_BACKWARDS
15 select CPU_PM if (SUSPEND || CPU_IDLE)
16 select GENERIC_CLOCKEVENTS
17 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
19 select GENERIC_IRQ_PROBE
20 select GENERIC_IRQ_SHOW
21 select GENERIC_SMP_IDLE_THREAD
22 select GENERIC_TIME_VSYSCALL
23 select HARDIRQS_SW_RESEND
24 select HAVE_ARCH_TRACEHOOK
25 select HAVE_DEBUG_BUGVERBOSE
26 select HAVE_DEBUG_KMEMLEAK
27 select HAVE_DMA_API_DEBUG
29 select HAVE_DMA_CONTIGUOUS
30 select HAVE_GENERIC_DMA_COHERENT
31 select HAVE_GENERIC_HARDIRQS
32 select HAVE_HW_BREAKPOINT if PERF_EVENTS
34 select HAVE_PERF_EVENTS
36 select MODULES_USE_ELF_RELA
39 select OF_EARLY_FLATTREE
40 select PERF_USE_VMALLOC
45 select SYSCTL_EXCEPTION_TRACE
47 ARM 64-bit (AArch64) Linux support.
52 config ARCH_PHYS_ADDR_T_64BIT
61 config STACKTRACE_SUPPORT
64 config LOCKDEP_SUPPORT
67 config TRACE_IRQFLAGS_SUPPORT
70 config RWSEM_GENERIC_SPINLOCK
73 config GENERIC_HWEIGHT
79 config GENERIC_CALIBRATE_DELAY
85 config ARCH_DMA_ADDR_T_64BIT
88 config NEED_DMA_MAP_STATE
91 config NEED_SG_DMA_LENGTH
100 source "init/Kconfig"
102 source "kernel/Kconfig.freezer"
104 menu "Platform selection"
107 bool "ARMv8 software model (Versatile Express)"
108 select ARCH_REQUIRE_GPIOLIB
109 select COMMON_CLK_VERSATILE
110 select POWER_RESET_VEXPRESS
111 select VEXPRESS_CONFIG
113 This enables support for the ARMv8 software model (Versatile
117 bool "AppliedMicro X-Gene SOC Family"
119 This enables support for AppliedMicro X-Gene SOC Family
130 menu "Kernel Features"
132 config ARM64_64K_PAGES
133 bool "Enable 64KB pages support"
135 This feature enables 64KB pages support (4KB by default)
136 allowing only two levels of page tables and faster TLB
137 look-up. AArch32 emulation is not available when this feature
140 config CPU_BIG_ENDIAN
141 bool "Build big-endian kernel"
143 Say Y if you plan on running a kernel in big-endian mode.
146 bool "Symmetric Multi-Processing"
147 select USE_GENERIC_SMP_HELPERS
149 This enables support for systems with more than one CPU. If
150 you say N here, the kernel will run on single and
151 multiprocessor machines, but will use only one CPU of a
152 multiprocessor machine. If you say Y here, the kernel will run
153 on many, but not all, single processor machines. On a single
154 processor machine, the kernel will run faster if you say N
157 If you don't know what to do here, say N.
160 bool "Multi-core scheduler support"
163 Multi-core scheduler support improves the CPU scheduler's decision
164 making when dealing with multi-core CPU chips at a cost of slightly
165 increased overhead in some places. If unsure say N here.
168 bool "SMT scheduler support"
171 Improves the CPU scheduler's decision making when dealing with
172 MultiThreading at a cost of slightly increased overhead in some
173 places. If unsure say N here.
175 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
176 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
178 Disables scheduler load-balancing at CPU sched domain level.
181 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
182 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
184 Experimental scheduler optimizations for heterogeneous platforms.
185 Attempts to introspectively select task affinity to optimize power
186 and performance. Basic support for multiple (>2) cpu types is in place,
187 but it has only been tested with two types of cpus.
188 There is currently no support for migration of task groups, hence
189 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
190 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
192 config SCHED_HMP_PRIO_FILTER
193 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
196 Enables task priority based HMP migration filter. Any task with
197 a NICE value above the threshold will always be on low-power cpus
198 with less compute capacity.
200 config SCHED_HMP_PRIO_FILTER_VAL
201 int "NICE priority threshold"
203 depends on SCHED_HMP_PRIO_FILTER
205 config HMP_FAST_CPU_MASK
206 string "HMP scheduler fast CPU mask"
209 Leave empty to use device tree information.
210 Specify the cpuids of the fast CPUs in the system as a list string,
211 e.g. cpuid 0+1 should be specified as 0-1.
213 config HMP_SLOW_CPU_MASK
214 string "HMP scheduler slow CPU mask"
217 Leave empty to use device tree information.
218 Specify the cpuids of the slow CPUs in the system as a list string,
219 e.g. cpuid 0+1 should be specified as 0-1.
221 config HMP_VARIABLE_SCALE
222 bool "Allows changing the load tracking scale through sysfs"
225 When turned on, this option exports the thresholds and load average
226 period value for the load tracking patches through sysfs.
227 The values can be modified to change the rate of load accumulation
228 and the thresholds used for HMP migration.
229 The load_avg_period_ms is the time in ms to reach a load average of
230 0.5 for an idle task of 0 load average ratio that start a busy loop.
231 The up_threshold and down_threshold is the value to go to a faster
232 CPU or to go back to a slower cpu.
233 The {up,down}_threshold are devided by 1024 before being compared
235 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
236 a running task with a load of 0 will be migrated to a bigger CPU after
237 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
239 This patch has the same behavior as changing the Y of the load
240 average computation to
241 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
242 but it remove intermadiate overflows in computation.
244 config HMP_FREQUENCY_INVARIANT_SCALE
245 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
246 depends on HMP_VARIABLE_SCALE && CPU_FREQ
248 Scales the current load contribution in line with the frequency
249 of the CPU that the task was executed on.
250 In this version, we use a simple linear scale derived from the
251 maximum frequency reported by CPUFreq.
252 Restricting tracked load to be scaled by the CPU's frequency
253 represents the consumption of possible compute capacity
254 (rather than consumption of actual instantaneous capacity as
255 normal) and allows the HMP migration's simple threshold
256 migration strategy to interact more predictably with CPUFreq's
257 asynchronous compute capacity changes.
259 config SCHED_HMP_LITTLE_PACKING
260 bool "Small task packing for HMP"
264 Allows the HMP Scheduler to pack small tasks into CPUs in the
266 Controlled by two sysfs files in sys/kernel/hmp.
267 packing_enable: 1 to enable, 0 to disable packing. Default 1.
268 packing_limit: runqueue load ratio where a RQ is considered
269 to be full. Default is NICE_0_LOAD * 9/8.
272 int "Maximum number of CPUs (2-32)"
275 # These have to remain sorted largest to smallest
279 bool "Support for hot-pluggable CPUs"
282 Say Y here to experiment with turning CPUs off and on. CPUs
283 can be controlled through /sys/devices/system/cpu.
285 source kernel/Kconfig.preempt
291 config ARCH_HAS_HOLES_MEMORYMODEL
292 def_bool y if SPARSEMEM
294 config ARCH_SPARSEMEM_ENABLE
296 select SPARSEMEM_VMEMMAP_ENABLE
298 config ARCH_SPARSEMEM_DEFAULT
299 def_bool ARCH_SPARSEMEM_ENABLE
301 config ARCH_SELECT_MEMORY_MODEL
302 def_bool ARCH_SPARSEMEM_ENABLE
304 config HAVE_ARCH_PFN_VALID
305 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
307 config HW_PERF_EVENTS
308 bool "Enable hardware performance counter support for perf events"
309 depends on PERF_EVENTS
312 Enable hardware performance counter support for perf events. If
313 disabled, perf events will use software events only.
315 config SYS_SUPPORTS_HUGETLBFS
318 config ARCH_WANT_GENERAL_HUGETLB
321 config ARCH_WANT_HUGE_PMD_SHARE
322 def_bool y if !ARM64_64K_PAGES
324 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
329 config FORCE_MAX_ZONEORDER
331 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
339 string "Default kernel command string"
342 Provide a set of default command-line options at build time by
343 entering them here. As a minimum, you should specify the the
344 root device (e.g. root=/dev/nfs).
347 bool "Always use the default kernel command string"
349 Always use the default kernel command string, even if the boot
350 loader passes other arguments to the kernel.
351 This is useful if you cannot or don't want to change the
352 command-line options your boot loader passes to the kernel.
356 menu "Userspace binary formats"
358 source "fs/Kconfig.binfmt"
361 bool "Kernel support for 32-bit EL0"
362 depends on !ARM64_64K_PAGES
363 select COMPAT_BINFMT_ELF
365 select OLD_SIGSUSPEND3
366 select COMPAT_OLD_SIGACTION
368 This option enables support for a 32-bit EL0 running under a 64-bit
369 kernel at EL1. AArch32-specific components such as system calls,
370 the user helper functions, VFP support and the ptrace interface are
371 handled appropriately by the kernel.
373 If you want to execute 32-bit userspace applications, say Y.
375 config SYSVIPC_COMPAT
377 depends on COMPAT && SYSVIPC
381 menu "Power management options"
383 source "kernel/power/Kconfig"
385 source "drivers/cpufreq/Kconfig"
386 config ARCH_SUSPEND_POSSIBLE
389 config ARM64_CPU_SUSPEND
394 menu "CPU Power Management"
396 source "drivers/cpuidle/Kconfig"
402 source "drivers/Kconfig"
406 source "arch/arm64/Kconfig.debug"
408 source "security/Kconfig"
410 source "crypto/Kconfig"