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
29 select HAVE_ARCH_TRACEHOOK
30 select HAVE_DEBUG_BUGVERBOSE
31 select HAVE_DEBUG_KMEMLEAK
32 select HAVE_DMA_API_DEBUG
34 select HAVE_DMA_CONTIGUOUS
35 select HAVE_EFFICIENT_UNALIGNED_ACCESS
36 select HAVE_GENERIC_DMA_COHERENT
37 select HAVE_GENERIC_HARDIRQS
38 select HAVE_HW_BREAKPOINT if PERF_EVENTS
40 select HAVE_PERF_EVENTS
42 select MODULES_USE_ELF_RELA
45 select OF_EARLY_FLATTREE
46 select PERF_USE_VMALLOC
51 select SYSCTL_EXCEPTION_TRACE
53 ARM 64-bit (AArch64) Linux support.
58 config ARCH_PHYS_ADDR_T_64BIT
67 config STACKTRACE_SUPPORT
70 config LOCKDEP_SUPPORT
73 config TRACE_IRQFLAGS_SUPPORT
76 config RWSEM_GENERIC_SPINLOCK
79 config GENERIC_HWEIGHT
85 config GENERIC_CALIBRATE_DELAY
91 config ARCH_DMA_ADDR_T_64BIT
94 config NEED_DMA_MAP_STATE
97 config NEED_SG_DMA_LENGTH
106 source "init/Kconfig"
108 source "kernel/Kconfig.freezer"
110 menu "Platform selection"
113 bool "ARMv8 software model (Versatile Express)"
114 select ARCH_REQUIRE_GPIOLIB
115 select COMMON_CLK_VERSATILE
116 select POWER_RESET_VEXPRESS
117 select VEXPRESS_CONFIG
119 This enables support for the ARMv8 software model (Versatile
123 bool "AppliedMicro X-Gene SOC Family"
125 This enables support for AppliedMicro X-Gene SOC Family
136 menu "Kernel Features"
138 config ARM64_64K_PAGES
139 bool "Enable 64KB pages support"
141 This feature enables 64KB pages support (4KB by default)
142 allowing only two levels of page tables and faster TLB
143 look-up. AArch32 emulation is not available when this feature
146 config CPU_BIG_ENDIAN
147 bool "Build big-endian kernel"
149 Say Y if you plan on running a kernel in big-endian mode.
152 bool "Symmetric Multi-Processing"
153 select USE_GENERIC_SMP_HELPERS
155 This enables support for systems with more than one CPU. If
156 you say N here, the kernel will run on single and
157 multiprocessor machines, but will use only one CPU of a
158 multiprocessor machine. If you say Y here, the kernel will run
159 on many, but not all, single processor machines. On a single
160 processor machine, the kernel will run faster if you say N
163 If you don't know what to do here, say N.
166 bool "Multi-core scheduler support"
169 Multi-core scheduler support improves the CPU scheduler's decision
170 making when dealing with multi-core CPU chips at a cost of slightly
171 increased overhead in some places. If unsure say N here.
174 bool "SMT scheduler support"
177 Improves the CPU scheduler's decision making when dealing with
178 MultiThreading at a cost of slightly increased overhead in some
179 places. If unsure say N here.
181 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
182 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
184 Disables scheduler load-balancing at CPU sched domain level.
187 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
188 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
190 Experimental scheduler optimizations for heterogeneous platforms.
191 Attempts to introspectively select task affinity to optimize power
192 and performance. Basic support for multiple (>2) cpu types is in place,
193 but it has only been tested with two types of cpus.
194 There is currently no support for migration of task groups, hence
195 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
196 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
198 config SCHED_HMP_PRIO_FILTER
199 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
202 Enables task priority based HMP migration filter. Any task with
203 a NICE value above the threshold will always be on low-power cpus
204 with less compute capacity.
206 config SCHED_HMP_PRIO_FILTER_VAL
207 int "NICE priority threshold"
209 depends on SCHED_HMP_PRIO_FILTER
211 config HMP_FAST_CPU_MASK
212 string "HMP scheduler fast CPU mask"
215 Leave empty to use device tree information.
216 Specify the cpuids of the fast CPUs in the system as a list string,
217 e.g. cpuid 0+1 should be specified as 0-1.
219 config HMP_SLOW_CPU_MASK
220 string "HMP scheduler slow CPU mask"
223 Leave empty to use device tree information.
224 Specify the cpuids of the slow CPUs in the system as a list string,
225 e.g. cpuid 0+1 should be specified as 0-1.
227 config HMP_VARIABLE_SCALE
228 bool "Allows changing the load tracking scale through sysfs"
231 When turned on, this option exports the thresholds and load average
232 period value for the load tracking patches through sysfs.
233 The values can be modified to change the rate of load accumulation
234 and the thresholds used for HMP migration.
235 The load_avg_period_ms is the time in ms to reach a load average of
236 0.5 for an idle task of 0 load average ratio that start a busy loop.
237 The up_threshold and down_threshold is the value to go to a faster
238 CPU or to go back to a slower cpu.
239 The {up,down}_threshold are devided by 1024 before being compared
241 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
242 a running task with a load of 0 will be migrated to a bigger CPU after
243 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
245 This patch has the same behavior as changing the Y of the load
246 average computation to
247 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
248 but it remove intermadiate overflows in computation.
250 config HMP_FREQUENCY_INVARIANT_SCALE
251 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
252 depends on HMP_VARIABLE_SCALE && CPU_FREQ
254 Scales the current load contribution in line with the frequency
255 of the CPU that the task was executed on.
256 In this version, we use a simple linear scale derived from the
257 maximum frequency reported by CPUFreq.
258 Restricting tracked load to be scaled by the CPU's frequency
259 represents the consumption of possible compute capacity
260 (rather than consumption of actual instantaneous capacity as
261 normal) and allows the HMP migration's simple threshold
262 migration strategy to interact more predictably with CPUFreq's
263 asynchronous compute capacity changes.
265 config SCHED_HMP_LITTLE_PACKING
266 bool "Small task packing for HMP"
270 Allows the HMP Scheduler to pack small tasks into CPUs in the
272 Controlled by two sysfs files in sys/kernel/hmp.
273 packing_enable: 1 to enable, 0 to disable packing. Default 1.
274 packing_limit: runqueue load ratio where a RQ is considered
275 to be full. Default is NICE_0_LOAD * 9/8.
278 int "Maximum number of CPUs (2-32)"
281 # These have to remain sorted largest to smallest
285 bool "Support for hot-pluggable CPUs"
288 Say Y here to experiment with turning CPUs off and on. CPUs
289 can be controlled through /sys/devices/system/cpu.
291 source kernel/Kconfig.preempt
297 config ARCH_HAS_HOLES_MEMORYMODEL
298 def_bool y if SPARSEMEM
300 config ARCH_SPARSEMEM_ENABLE
302 select SPARSEMEM_VMEMMAP_ENABLE
304 config ARCH_SPARSEMEM_DEFAULT
305 def_bool ARCH_SPARSEMEM_ENABLE
307 config ARCH_SELECT_MEMORY_MODEL
308 def_bool ARCH_SPARSEMEM_ENABLE
310 config HAVE_ARCH_PFN_VALID
311 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
313 config HW_PERF_EVENTS
314 bool "Enable hardware performance counter support for perf events"
315 depends on PERF_EVENTS
318 Enable hardware performance counter support for perf events. If
319 disabled, perf events will use software events only.
321 config SYS_SUPPORTS_HUGETLBFS
324 config ARCH_WANT_GENERAL_HUGETLB
327 config ARCH_WANT_HUGE_PMD_SHARE
328 def_bool y if !ARM64_64K_PAGES
330 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
335 config FORCE_MAX_ZONEORDER
337 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
345 string "Default kernel command string"
348 Provide a set of default command-line options at build time by
349 entering them here. As a minimum, you should specify the the
350 root device (e.g. root=/dev/nfs).
353 bool "Always use the default kernel command string"
355 Always use the default kernel command string, even if the boot
356 loader passes other arguments to the kernel.
357 This is useful if you cannot or don't want to change the
358 command-line options your boot loader passes to the kernel.
362 menu "Userspace binary formats"
364 source "fs/Kconfig.binfmt"
367 bool "Kernel support for 32-bit EL0"
368 depends on !ARM64_64K_PAGES
369 select COMPAT_BINFMT_ELF
371 select OLD_SIGSUSPEND3
372 select COMPAT_OLD_SIGACTION
374 This option enables support for a 32-bit EL0 running under a 64-bit
375 kernel at EL1. AArch32-specific components such as system calls,
376 the user helper functions, VFP support and the ptrace interface are
377 handled appropriately by the kernel.
379 If you want to execute 32-bit userspace applications, say Y.
381 config SYSVIPC_COMPAT
383 depends on COMPAT && SYSVIPC
387 menu "Power management options"
389 source "kernel/power/Kconfig"
391 source "drivers/cpufreq/Kconfig"
392 config ARCH_SUSPEND_POSSIBLE
395 config ARM64_CPU_SUSPEND
400 menu "CPU Power Management"
402 source "drivers/cpuidle/Kconfig"
408 source "drivers/Kconfig"
412 source "arch/arm64/Kconfig.debug"
414 source "security/Kconfig"
416 source "crypto/Kconfig"