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 DCACHE_WORD_ACCESS
17 select GENERIC_CLOCKEVENTS
18 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
20 select GENERIC_IRQ_PROBE
21 select GENERIC_IRQ_SHOW
22 select GENERIC_SMP_IDLE_THREAD
23 select GENERIC_STRNCPY_FROM_USER
24 select GENERIC_STRNLEN_USER
25 select GENERIC_TIME_VSYSCALL
26 select HARDIRQS_SW_RESEND
27 select HAVE_ARCH_JUMP_LABEL
28 select HAVE_ARCH_TRACEHOOK
29 select HAVE_DEBUG_BUGVERBOSE
30 select HAVE_DEBUG_KMEMLEAK
31 select HAVE_DMA_API_DEBUG
33 select HAVE_DMA_CONTIGUOUS
34 select HAVE_EFFICIENT_UNALIGNED_ACCESS
35 select HAVE_GENERIC_DMA_COHERENT
36 select HAVE_GENERIC_HARDIRQS
37 select HAVE_HW_BREAKPOINT if PERF_EVENTS
39 select HAVE_PERF_EVENTS
41 select MODULES_USE_ELF_RELA
44 select OF_EARLY_FLATTREE
45 select PERF_USE_VMALLOC
50 select SYSCTL_EXCEPTION_TRACE
52 ARM 64-bit (AArch64) Linux support.
57 config ARCH_PHYS_ADDR_T_64BIT
66 config STACKTRACE_SUPPORT
69 config LOCKDEP_SUPPORT
72 config TRACE_IRQFLAGS_SUPPORT
75 config RWSEM_GENERIC_SPINLOCK
78 config GENERIC_HWEIGHT
84 config GENERIC_CALIBRATE_DELAY
90 config ARCH_DMA_ADDR_T_64BIT
93 config NEED_DMA_MAP_STATE
96 config NEED_SG_DMA_LENGTH
105 source "init/Kconfig"
107 source "kernel/Kconfig.freezer"
109 menu "Platform selection"
112 bool "ARMv8 software model (Versatile Express)"
113 select ARCH_REQUIRE_GPIOLIB
114 select COMMON_CLK_VERSATILE
115 select POWER_RESET_VEXPRESS
116 select VEXPRESS_CONFIG
118 This enables support for the ARMv8 software model (Versatile
122 bool "AppliedMicro X-Gene SOC Family"
124 This enables support for AppliedMicro X-Gene SOC Family
135 menu "Kernel Features"
137 config ARM64_64K_PAGES
138 bool "Enable 64KB pages support"
140 This feature enables 64KB pages support (4KB by default)
141 allowing only two levels of page tables and faster TLB
142 look-up. AArch32 emulation is not available when this feature
145 config CPU_BIG_ENDIAN
146 bool "Build big-endian kernel"
148 Say Y if you plan on running a kernel in big-endian mode.
151 bool "Symmetric Multi-Processing"
152 select USE_GENERIC_SMP_HELPERS
154 This enables support for systems with more than one CPU. If
155 you say N here, the kernel will run on single and
156 multiprocessor machines, but will use only one CPU of a
157 multiprocessor machine. If you say Y here, the kernel will run
158 on many, but not all, single processor machines. On a single
159 processor machine, the kernel will run faster if you say N
162 If you don't know what to do here, say N.
165 bool "Multi-core scheduler support"
168 Multi-core scheduler support improves the CPU scheduler's decision
169 making when dealing with multi-core CPU chips at a cost of slightly
170 increased overhead in some places. If unsure say N here.
173 bool "SMT scheduler support"
176 Improves the CPU scheduler's decision making when dealing with
177 MultiThreading at a cost of slightly increased overhead in some
178 places. If unsure say N here.
180 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
181 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
183 Disables scheduler load-balancing at CPU sched domain level.
186 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
187 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
189 Experimental scheduler optimizations for heterogeneous platforms.
190 Attempts to introspectively select task affinity to optimize power
191 and performance. Basic support for multiple (>2) cpu types is in place,
192 but it has only been tested with two types of cpus.
193 There is currently no support for migration of task groups, hence
194 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
195 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
197 config SCHED_HMP_PRIO_FILTER
198 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
201 Enables task priority based HMP migration filter. Any task with
202 a NICE value above the threshold will always be on low-power cpus
203 with less compute capacity.
205 config SCHED_HMP_PRIO_FILTER_VAL
206 int "NICE priority threshold"
208 depends on SCHED_HMP_PRIO_FILTER
210 config HMP_FAST_CPU_MASK
211 string "HMP scheduler fast CPU mask"
214 Leave empty to use device tree information.
215 Specify the cpuids of the fast CPUs in the system as a list string,
216 e.g. cpuid 0+1 should be specified as 0-1.
218 config HMP_SLOW_CPU_MASK
219 string "HMP scheduler slow CPU mask"
222 Leave empty to use device tree information.
223 Specify the cpuids of the slow CPUs in the system as a list string,
224 e.g. cpuid 0+1 should be specified as 0-1.
226 config HMP_VARIABLE_SCALE
227 bool "Allows changing the load tracking scale through sysfs"
230 When turned on, this option exports the thresholds and load average
231 period value for the load tracking patches through sysfs.
232 The values can be modified to change the rate of load accumulation
233 and the thresholds used for HMP migration.
234 The load_avg_period_ms is the time in ms to reach a load average of
235 0.5 for an idle task of 0 load average ratio that start a busy loop.
236 The up_threshold and down_threshold is the value to go to a faster
237 CPU or to go back to a slower cpu.
238 The {up,down}_threshold are devided by 1024 before being compared
240 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
241 a running task with a load of 0 will be migrated to a bigger CPU after
242 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
244 This patch has the same behavior as changing the Y of the load
245 average computation to
246 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
247 but it remove intermadiate overflows in computation.
249 config HMP_FREQUENCY_INVARIANT_SCALE
250 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
251 depends on HMP_VARIABLE_SCALE && CPU_FREQ
253 Scales the current load contribution in line with the frequency
254 of the CPU that the task was executed on.
255 In this version, we use a simple linear scale derived from the
256 maximum frequency reported by CPUFreq.
257 Restricting tracked load to be scaled by the CPU's frequency
258 represents the consumption of possible compute capacity
259 (rather than consumption of actual instantaneous capacity as
260 normal) and allows the HMP migration's simple threshold
261 migration strategy to interact more predictably with CPUFreq's
262 asynchronous compute capacity changes.
264 config SCHED_HMP_LITTLE_PACKING
265 bool "Small task packing for HMP"
269 Allows the HMP Scheduler to pack small tasks into CPUs in the
271 Controlled by two sysfs files in sys/kernel/hmp.
272 packing_enable: 1 to enable, 0 to disable packing. Default 1.
273 packing_limit: runqueue load ratio where a RQ is considered
274 to be full. Default is NICE_0_LOAD * 9/8.
277 int "Maximum number of CPUs (2-32)"
280 # These have to remain sorted largest to smallest
284 bool "Support for hot-pluggable CPUs"
287 Say Y here to experiment with turning CPUs off and on. CPUs
288 can be controlled through /sys/devices/system/cpu.
290 source kernel/Kconfig.preempt
296 config ARCH_HAS_HOLES_MEMORYMODEL
297 def_bool y if SPARSEMEM
299 config ARCH_SPARSEMEM_ENABLE
301 select SPARSEMEM_VMEMMAP_ENABLE
303 config ARCH_SPARSEMEM_DEFAULT
304 def_bool ARCH_SPARSEMEM_ENABLE
306 config ARCH_SELECT_MEMORY_MODEL
307 def_bool ARCH_SPARSEMEM_ENABLE
309 config HAVE_ARCH_PFN_VALID
310 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
312 config HW_PERF_EVENTS
313 bool "Enable hardware performance counter support for perf events"
314 depends on PERF_EVENTS
317 Enable hardware performance counter support for perf events. If
318 disabled, perf events will use software events only.
320 config SYS_SUPPORTS_HUGETLBFS
323 config ARCH_WANT_GENERAL_HUGETLB
326 config ARCH_WANT_HUGE_PMD_SHARE
327 def_bool y if !ARM64_64K_PAGES
329 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
334 config FORCE_MAX_ZONEORDER
336 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
344 string "Default kernel command string"
347 Provide a set of default command-line options at build time by
348 entering them here. As a minimum, you should specify the the
349 root device (e.g. root=/dev/nfs).
352 bool "Always use the default kernel command string"
354 Always use the default kernel command string, even if the boot
355 loader passes other arguments to the kernel.
356 This is useful if you cannot or don't want to change the
357 command-line options your boot loader passes to the kernel.
361 menu "Userspace binary formats"
363 source "fs/Kconfig.binfmt"
366 bool "Kernel support for 32-bit EL0"
367 depends on !ARM64_64K_PAGES
368 select COMPAT_BINFMT_ELF
370 select OLD_SIGSUSPEND3
371 select COMPAT_OLD_SIGACTION
373 This option enables support for a 32-bit EL0 running under a 64-bit
374 kernel at EL1. AArch32-specific components such as system calls,
375 the user helper functions, VFP support and the ptrace interface are
376 handled appropriately by the kernel.
378 If you want to execute 32-bit userspace applications, say Y.
380 config SYSVIPC_COMPAT
382 depends on COMPAT && SYSVIPC
386 menu "Power management options"
388 source "kernel/power/Kconfig"
390 source "drivers/cpufreq/Kconfig"
391 config ARCH_SUSPEND_POSSIBLE
394 config ARM64_CPU_SUSPEND
399 menu "CPU Power Management"
401 source "drivers/cpuidle/Kconfig"
407 source "drivers/Kconfig"
411 source "arch/arm64/Kconfig.debug"
413 source "security/Kconfig"
415 source "crypto/Kconfig"