3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
4 select ARCH_WANT_OPTIONAL_GPIOLIB
5 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
6 select ARCH_WANT_FRAME_POINTERS
10 select CLONE_BACKWARDS
12 select GENERIC_CLOCKEVENTS
14 select GENERIC_IRQ_PROBE
15 select GENERIC_IRQ_SHOW
16 select GENERIC_SMP_IDLE_THREAD
17 select GENERIC_TIME_VSYSCALL
18 select HARDIRQS_SW_RESEND
19 select HAVE_ARCH_TRACEHOOK
20 select HAVE_DEBUG_BUGVERBOSE
21 select HAVE_DEBUG_KMEMLEAK
22 select HAVE_DMA_API_DEBUG
24 select HAVE_GENERIC_DMA_COHERENT
25 select HAVE_GENERIC_HARDIRQS
26 select HAVE_HW_BREAKPOINT if PERF_EVENTS
28 select HAVE_PERF_EVENTS
30 select MODULES_USE_ELF_RELA
33 select OF_EARLY_FLATTREE
34 select PERF_USE_VMALLOC
39 select SYSCTL_EXCEPTION_TRACE
41 ARM 64-bit (AArch64) Linux support.
46 config ARCH_PHYS_ADDR_T_64BIT
55 config STACKTRACE_SUPPORT
58 config LOCKDEP_SUPPORT
61 config TRACE_IRQFLAGS_SUPPORT
64 config GENERIC_LOCKBREAK
66 depends on SMP && PREEMPT
68 config RWSEM_GENERIC_SPINLOCK
71 config GENERIC_HWEIGHT
77 config GENERIC_CALIBRATE_DELAY
83 config ARCH_DMA_ADDR_T_64BIT
86 config NEED_DMA_MAP_STATE
89 config NEED_SG_DMA_LENGTH
100 source "kernel/Kconfig.freezer"
102 menu "Platform selection"
105 bool "ARMv8 software model (Versatile Express)"
106 select ARCH_REQUIRE_GPIOLIB
107 select COMMON_CLK_VERSATILE
108 select POWER_RESET_VEXPRESS
109 select VEXPRESS_CONFIG
111 This enables support for the ARMv8 software model (Versatile
123 menu "Kernel Features"
125 config ARM64_64K_PAGES
126 bool "Enable 64KB pages support"
128 This feature enables 64KB pages support (4KB by default)
129 allowing only two levels of page tables and faster TLB
130 look-up. AArch32 emulation is not available when this feature
134 bool "Symmetric Multi-Processing"
135 select USE_GENERIC_SMP_HELPERS
137 This enables support for systems with more than one CPU. If
138 you say N here, the kernel will run on single and
139 multiprocessor machines, but will use only one CPU of a
140 multiprocessor machine. If you say Y here, the kernel will run
141 on many, but not all, single processor machines. On a single
142 processor machine, the kernel will run faster if you say N
145 If you don't know what to do here, say N.
148 bool "Multi-core scheduler support"
151 Multi-core scheduler support improves the CPU scheduler's decision
152 making when dealing with multi-core CPU chips at a cost of slightly
153 increased overhead in some places. If unsure say N here.
156 bool "SMT scheduler support"
159 Improves the CPU scheduler's decision making when dealing with
160 MultiThreading at a cost of slightly increased overhead in some
161 places. If unsure say N here.
163 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
164 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
166 Disables scheduler load-balancing at CPU sched domain level.
169 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
170 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
172 Experimental scheduler optimizations for heterogeneous platforms.
173 Attempts to introspectively select task affinity to optimize power
174 and performance. Basic support for multiple (>2) cpu types is in place,
175 but it has only been tested with two types of cpus.
176 There is currently no support for migration of task groups, hence
177 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
178 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
180 config SCHED_HMP_PRIO_FILTER
181 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
184 Enables task priority based HMP migration filter. Any task with
185 a NICE value above the threshold will always be on low-power cpus
186 with less compute capacity.
188 config SCHED_HMP_PRIO_FILTER_VAL
189 int "NICE priority threshold"
191 depends on SCHED_HMP_PRIO_FILTER
193 config HMP_FAST_CPU_MASK
194 string "HMP scheduler fast CPU mask"
197 Leave empty to use device tree information.
198 Specify the cpuids of the fast CPUs in the system as a list string,
199 e.g. cpuid 0+1 should be specified as 0-1.
201 config HMP_SLOW_CPU_MASK
202 string "HMP scheduler slow CPU mask"
205 Leave empty to use device tree information.
206 Specify the cpuids of the slow CPUs in the system as a list string,
207 e.g. cpuid 0+1 should be specified as 0-1.
209 config HMP_VARIABLE_SCALE
210 bool "Allows changing the load tracking scale through sysfs"
213 When turned on, this option exports the thresholds and load average
214 period value for the load tracking patches through sysfs.
215 The values can be modified to change the rate of load accumulation
216 and the thresholds used for HMP migration.
217 The load_avg_period_ms is the time in ms to reach a load average of
218 0.5 for an idle task of 0 load average ratio that start a busy loop.
219 The up_threshold and down_threshold is the value to go to a faster
220 CPU or to go back to a slower cpu.
221 The {up,down}_threshold are devided by 1024 before being compared
223 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
224 a running task with a load of 0 will be migrated to a bigger CPU after
225 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
227 This patch has the same behavior as changing the Y of the load
228 average computation to
229 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
230 but it remove intermadiate overflows in computation.
232 config HMP_FREQUENCY_INVARIANT_SCALE
233 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
234 depends on HMP_VARIABLE_SCALE && CPU_FREQ
236 Scales the current load contribution in line with the frequency
237 of the CPU that the task was executed on.
238 In this version, we use a simple linear scale derived from the
239 maximum frequency reported by CPUFreq.
240 Restricting tracked load to be scaled by the CPU's frequency
241 represents the consumption of possible compute capacity
242 (rather than consumption of actual instantaneous capacity as
243 normal) and allows the HMP migration's simple threshold
244 migration strategy to interact more predictably with CPUFreq's
245 asynchronous compute capacity changes.
247 config SCHED_HMP_LITTLE_PACKING
248 bool "Small task packing for HMP"
252 Allows the HMP Scheduler to pack small tasks into CPUs in the
254 Controlled by two sysfs files in sys/kernel/hmp.
255 packing_enable: 1 to enable, 0 to disable packing. Default 1.
256 packing_limit: runqueue load ratio where a RQ is considered
257 to be full. Default is NICE_0_LOAD * 9/8.
260 int "Maximum number of CPUs (2-32)"
265 source kernel/Kconfig.preempt
271 config ARCH_HAS_HOLES_MEMORYMODEL
272 def_bool y if SPARSEMEM
274 config ARCH_SPARSEMEM_ENABLE
276 select SPARSEMEM_VMEMMAP_ENABLE
278 config ARCH_SPARSEMEM_DEFAULT
279 def_bool ARCH_SPARSEMEM_ENABLE
281 config ARCH_SELECT_MEMORY_MODEL
282 def_bool ARCH_SPARSEMEM_ENABLE
284 config HAVE_ARCH_PFN_VALID
285 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
287 config HW_PERF_EVENTS
288 bool "Enable hardware performance counter support for perf events"
289 depends on PERF_EVENTS
292 Enable hardware performance counter support for perf events. If
293 disabled, perf events will use software events only.
302 string "Default kernel command string"
305 Provide a set of default command-line options at build time by
306 entering them here. As a minimum, you should specify the the
307 root device (e.g. root=/dev/nfs).
310 bool "Always use the default kernel command string"
312 Always use the default kernel command string, even if the boot
313 loader passes other arguments to the kernel.
314 This is useful if you cannot or don't want to change the
315 command-line options your boot loader passes to the kernel.
319 menu "Userspace binary formats"
321 source "fs/Kconfig.binfmt"
324 bool "Kernel support for 32-bit EL0"
325 depends on !ARM64_64K_PAGES
326 select COMPAT_BINFMT_ELF
328 select OLD_SIGSUSPEND3
329 select COMPAT_OLD_SIGACTION
331 This option enables support for a 32-bit EL0 running under a 64-bit
332 kernel at EL1. AArch32-specific components such as system calls,
333 the user helper functions, VFP support and the ptrace interface are
334 handled appropriately by the kernel.
336 If you want to execute 32-bit userspace applications, say Y.
338 config SYSVIPC_COMPAT
340 depends on COMPAT && SYSVIPC
346 source "drivers/Kconfig"
350 source "arch/arm64/Kconfig.debug"
352 source "security/Kconfig"
354 source "crypto/Kconfig"