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_TRACEHOOK
28 select HAVE_DEBUG_BUGVERBOSE
29 select HAVE_DEBUG_KMEMLEAK
30 select HAVE_DMA_API_DEBUG
32 select HAVE_DMA_CONTIGUOUS
33 select HAVE_EFFICIENT_UNALIGNED_ACCESS
34 select HAVE_GENERIC_DMA_COHERENT
35 select HAVE_GENERIC_HARDIRQS
36 select HAVE_HW_BREAKPOINT if PERF_EVENTS
38 select HAVE_PERF_EVENTS
40 select MODULES_USE_ELF_RELA
43 select OF_EARLY_FLATTREE
44 select PERF_USE_VMALLOC
49 select SYSCTL_EXCEPTION_TRACE
51 ARM 64-bit (AArch64) Linux support.
56 config ARCH_PHYS_ADDR_T_64BIT
65 config STACKTRACE_SUPPORT
68 config LOCKDEP_SUPPORT
71 config TRACE_IRQFLAGS_SUPPORT
74 config RWSEM_GENERIC_SPINLOCK
77 config GENERIC_HWEIGHT
83 config GENERIC_CALIBRATE_DELAY
89 config ARCH_DMA_ADDR_T_64BIT
92 config NEED_DMA_MAP_STATE
95 config NEED_SG_DMA_LENGTH
104 source "init/Kconfig"
106 source "kernel/Kconfig.freezer"
108 menu "Platform selection"
111 bool "ARMv8 software model (Versatile Express)"
112 select ARCH_REQUIRE_GPIOLIB
113 select COMMON_CLK_VERSATILE
114 select POWER_RESET_VEXPRESS
115 select VEXPRESS_CONFIG
117 This enables support for the ARMv8 software model (Versatile
121 bool "AppliedMicro X-Gene SOC Family"
123 This enables support for AppliedMicro X-Gene SOC Family
134 menu "Kernel Features"
136 config ARM64_64K_PAGES
137 bool "Enable 64KB pages support"
139 This feature enables 64KB pages support (4KB by default)
140 allowing only two levels of page tables and faster TLB
141 look-up. AArch32 emulation is not available when this feature
144 config CPU_BIG_ENDIAN
145 bool "Build big-endian kernel"
147 Say Y if you plan on running a kernel in big-endian mode.
150 bool "Symmetric Multi-Processing"
151 select USE_GENERIC_SMP_HELPERS
153 This enables support for systems with more than one CPU. If
154 you say N here, the kernel will run on single and
155 multiprocessor machines, but will use only one CPU of a
156 multiprocessor machine. If you say Y here, the kernel will run
157 on many, but not all, single processor machines. On a single
158 processor machine, the kernel will run faster if you say N
161 If you don't know what to do here, say N.
164 bool "Multi-core scheduler support"
167 Multi-core scheduler support improves the CPU scheduler's decision
168 making when dealing with multi-core CPU chips at a cost of slightly
169 increased overhead in some places. If unsure say N here.
172 bool "SMT scheduler support"
175 Improves the CPU scheduler's decision making when dealing with
176 MultiThreading at a cost of slightly increased overhead in some
177 places. If unsure say N here.
179 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
180 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
182 Disables scheduler load-balancing at CPU sched domain level.
185 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
186 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
188 Experimental scheduler optimizations for heterogeneous platforms.
189 Attempts to introspectively select task affinity to optimize power
190 and performance. Basic support for multiple (>2) cpu types is in place,
191 but it has only been tested with two types of cpus.
192 There is currently no support for migration of task groups, hence
193 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
194 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
196 config SCHED_HMP_PRIO_FILTER
197 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
200 Enables task priority based HMP migration filter. Any task with
201 a NICE value above the threshold will always be on low-power cpus
202 with less compute capacity.
204 config SCHED_HMP_PRIO_FILTER_VAL
205 int "NICE priority threshold"
207 depends on SCHED_HMP_PRIO_FILTER
209 config HMP_FAST_CPU_MASK
210 string "HMP scheduler fast CPU mask"
213 Leave empty to use device tree information.
214 Specify the cpuids of the fast CPUs in the system as a list string,
215 e.g. cpuid 0+1 should be specified as 0-1.
217 config HMP_SLOW_CPU_MASK
218 string "HMP scheduler slow CPU mask"
221 Leave empty to use device tree information.
222 Specify the cpuids of the slow CPUs in the system as a list string,
223 e.g. cpuid 0+1 should be specified as 0-1.
225 config HMP_VARIABLE_SCALE
226 bool "Allows changing the load tracking scale through sysfs"
229 When turned on, this option exports the thresholds and load average
230 period value for the load tracking patches through sysfs.
231 The values can be modified to change the rate of load accumulation
232 and the thresholds used for HMP migration.
233 The load_avg_period_ms is the time in ms to reach a load average of
234 0.5 for an idle task of 0 load average ratio that start a busy loop.
235 The up_threshold and down_threshold is the value to go to a faster
236 CPU or to go back to a slower cpu.
237 The {up,down}_threshold are devided by 1024 before being compared
239 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
240 a running task with a load of 0 will be migrated to a bigger CPU after
241 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
243 This patch has the same behavior as changing the Y of the load
244 average computation to
245 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
246 but it remove intermadiate overflows in computation.
248 config HMP_FREQUENCY_INVARIANT_SCALE
249 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
250 depends on HMP_VARIABLE_SCALE && CPU_FREQ
252 Scales the current load contribution in line with the frequency
253 of the CPU that the task was executed on.
254 In this version, we use a simple linear scale derived from the
255 maximum frequency reported by CPUFreq.
256 Restricting tracked load to be scaled by the CPU's frequency
257 represents the consumption of possible compute capacity
258 (rather than consumption of actual instantaneous capacity as
259 normal) and allows the HMP migration's simple threshold
260 migration strategy to interact more predictably with CPUFreq's
261 asynchronous compute capacity changes.
263 config SCHED_HMP_LITTLE_PACKING
264 bool "Small task packing for HMP"
268 Allows the HMP Scheduler to pack small tasks into CPUs in the
270 Controlled by two sysfs files in sys/kernel/hmp.
271 packing_enable: 1 to enable, 0 to disable packing. Default 1.
272 packing_limit: runqueue load ratio where a RQ is considered
273 to be full. Default is NICE_0_LOAD * 9/8.
276 int "Maximum number of CPUs (2-32)"
279 # These have to remain sorted largest to smallest
283 bool "Support for hot-pluggable CPUs"
286 Say Y here to experiment with turning CPUs off and on. CPUs
287 can be controlled through /sys/devices/system/cpu.
289 source kernel/Kconfig.preempt
295 config ARCH_HAS_HOLES_MEMORYMODEL
296 def_bool y if SPARSEMEM
298 config ARCH_SPARSEMEM_ENABLE
300 select SPARSEMEM_VMEMMAP_ENABLE
302 config ARCH_SPARSEMEM_DEFAULT
303 def_bool ARCH_SPARSEMEM_ENABLE
305 config ARCH_SELECT_MEMORY_MODEL
306 def_bool ARCH_SPARSEMEM_ENABLE
308 config HAVE_ARCH_PFN_VALID
309 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
311 config HW_PERF_EVENTS
312 bool "Enable hardware performance counter support for perf events"
313 depends on PERF_EVENTS
316 Enable hardware performance counter support for perf events. If
317 disabled, perf events will use software events only.
319 config SYS_SUPPORTS_HUGETLBFS
322 config ARCH_WANT_GENERAL_HUGETLB
325 config ARCH_WANT_HUGE_PMD_SHARE
326 def_bool y if !ARM64_64K_PAGES
328 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
333 config FORCE_MAX_ZONEORDER
335 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
343 string "Default kernel command string"
346 Provide a set of default command-line options at build time by
347 entering them here. As a minimum, you should specify the the
348 root device (e.g. root=/dev/nfs).
351 bool "Always use the default kernel command string"
353 Always use the default kernel command string, even if the boot
354 loader passes other arguments to the kernel.
355 This is useful if you cannot or don't want to change the
356 command-line options your boot loader passes to the kernel.
360 menu "Userspace binary formats"
362 source "fs/Kconfig.binfmt"
365 bool "Kernel support for 32-bit EL0"
366 depends on !ARM64_64K_PAGES
367 select COMPAT_BINFMT_ELF
369 select OLD_SIGSUSPEND3
370 select COMPAT_OLD_SIGACTION
372 This option enables support for a 32-bit EL0 running under a 64-bit
373 kernel at EL1. AArch32-specific components such as system calls,
374 the user helper functions, VFP support and the ptrace interface are
375 handled appropriately by the kernel.
377 If you want to execute 32-bit userspace applications, say Y.
379 config SYSVIPC_COMPAT
381 depends on COMPAT && SYSVIPC
385 menu "Power management options"
387 source "kernel/power/Kconfig"
389 source "drivers/cpufreq/Kconfig"
390 config ARCH_SUSPEND_POSSIBLE
393 config ARM64_CPU_SUSPEND
398 menu "CPU Power Management"
400 source "drivers/cpuidle/Kconfig"
406 source "drivers/Kconfig"
410 source "arch/arm64/Kconfig.debug"
412 source "security/Kconfig"
414 source "crypto/Kconfig"