3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
4 select ARCH_USE_CMPXCHG_LOCKREF
6 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
7 select ARCH_SUPPORTS_ATOMIC_RMW
8 select ARCH_WANT_OPTIONAL_GPIOLIB
9 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
10 select ARCH_WANT_FRAME_POINTERS
15 select BUILDTIME_EXTABLE_SORT
16 select CLONE_BACKWARDS
18 select CPU_PM if (SUSPEND || CPU_IDLE)
19 select DCACHE_WORD_ACCESS
20 select GENERIC_CLOCKEVENTS
21 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
22 select GENERIC_CPU_AUTOPROBE
23 select GENERIC_EARLY_IOREMAP
25 select GENERIC_IRQ_PROBE
26 select GENERIC_IRQ_SHOW
27 select GENERIC_SMP_IDLE_THREAD
28 select GENERIC_STRNCPY_FROM_USER
29 select GENERIC_STRNLEN_USER
30 select GENERIC_TIME_VSYSCALL
31 select HARDIRQS_SW_RESEND
32 select HAVE_ARCH_JUMP_LABEL
34 select HAVE_ARCH_TRACEHOOK
35 select HAVE_C_RECORDMCOUNT
36 select HAVE_DEBUG_BUGVERBOSE
37 select HAVE_DEBUG_KMEMLEAK
38 select HAVE_DMA_API_DEBUG
40 select HAVE_DMA_CONTIGUOUS
41 select HAVE_DYNAMIC_FTRACE
42 select HAVE_EFFICIENT_UNALIGNED_ACCESS
43 select HAVE_FTRACE_MCOUNT_RECORD
44 select HAVE_FUNCTION_TRACER
45 select HAVE_FUNCTION_GRAPH_TRACER
46 select HAVE_GENERIC_DMA_COHERENT
47 select HAVE_GENERIC_HARDIRQS
48 select HAVE_HW_BREAKPOINT if PERF_EVENTS
50 select HAVE_PATA_PLATFORM
51 select HAVE_PERF_EVENTS
53 select HAVE_PERF_USER_STACK_DUMP
54 select HAVE_SYSCALL_TRACEPOINTS
56 select MODULES_USE_ELF_RELA
59 select OF_EARLY_FLATTREE
60 select OF_RESERVED_MEM
61 select PERF_USE_VMALLOC
66 select SYSCTL_EXCEPTION_TRACE
68 ARM 64-bit (AArch64) Linux support.
73 config ARCH_PHYS_ADDR_T_64BIT
82 config STACKTRACE_SUPPORT
85 config LOCKDEP_SUPPORT
88 config TRACE_IRQFLAGS_SUPPORT
91 config RWSEM_XCHGADD_ALGORITHM
94 config GENERIC_HWEIGHT
100 config GENERIC_CALIBRATE_DELAY
106 config ARCH_DMA_ADDR_T_64BIT
109 config NEED_DMA_MAP_STATE
112 config NEED_SG_DMA_LENGTH
121 config FIX_EARLYCON_MEM
124 source "init/Kconfig"
126 source "kernel/Kconfig.freezer"
128 menu "Platform selection"
131 bool "ARMv8 software model (Versatile Express)"
132 select ARCH_REQUIRE_GPIOLIB
133 select COMMON_CLK_VERSATILE
134 select POWER_RESET_VEXPRESS
135 select VEXPRESS_CONFIG
137 This enables support for the ARMv8 software model (Versatile
141 bool "AppliedMicro X-Gene SOC Family"
143 This enables support for AppliedMicro X-Gene SOC Family
154 menu "Kernel Features"
156 config ARM64_64K_PAGES
157 bool "Enable 64KB pages support"
159 This feature enables 64KB pages support (4KB by default)
160 allowing only two levels of page tables and faster TLB
161 look-up. AArch32 emulation is not available when this feature
164 config CPU_BIG_ENDIAN
165 bool "Build big-endian kernel"
167 Say Y if you plan on running a kernel in big-endian mode.
170 bool "Symmetric Multi-Processing"
171 select USE_GENERIC_SMP_HELPERS
173 This enables support for systems with more than one CPU. If
174 you say N here, the kernel will run on single and
175 multiprocessor machines, but will use only one CPU of a
176 multiprocessor machine. If you say Y here, the kernel will run
177 on many, but not all, single processor machines. On a single
178 processor machine, the kernel will run faster if you say N
181 If you don't know what to do here, say N.
184 bool "Multi-core scheduler support"
187 Multi-core scheduler support improves the CPU scheduler's decision
188 making when dealing with multi-core CPU chips at a cost of slightly
189 increased overhead in some places. If unsure say N here.
192 bool "SMT scheduler support"
195 Improves the CPU scheduler's decision making when dealing with
196 MultiThreading at a cost of slightly increased overhead in some
197 places. If unsure say N here.
199 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
200 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
202 Disables scheduler load-balancing at CPU sched domain level.
205 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
206 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
208 Experimental scheduler optimizations for heterogeneous platforms.
209 Attempts to introspectively select task affinity to optimize power
210 and performance. Basic support for multiple (>2) cpu types is in place,
211 but it has only been tested with two types of cpus.
212 There is currently no support for migration of task groups, hence
213 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
214 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
216 config SCHED_HMP_PRIO_FILTER
217 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
220 Enables task priority based HMP migration filter. Any task with
221 a NICE value above the threshold will always be on low-power cpus
222 with less compute capacity.
224 config SCHED_HMP_PRIO_FILTER_VAL
225 int "NICE priority threshold"
227 depends on SCHED_HMP_PRIO_FILTER
229 config HMP_FAST_CPU_MASK
230 string "HMP scheduler fast CPU mask"
233 Leave empty to use device tree information.
234 Specify the cpuids of the fast CPUs in the system as a list string,
235 e.g. cpuid 0+1 should be specified as 0-1.
237 config HMP_SLOW_CPU_MASK
238 string "HMP scheduler slow CPU mask"
241 Leave empty to use device tree information.
242 Specify the cpuids of the slow CPUs in the system as a list string,
243 e.g. cpuid 0+1 should be specified as 0-1.
245 config HMP_VARIABLE_SCALE
246 bool "Allows changing the load tracking scale through sysfs"
249 When turned on, this option exports the thresholds and load average
250 period value for the load tracking patches through sysfs.
251 The values can be modified to change the rate of load accumulation
252 and the thresholds used for HMP migration.
253 The load_avg_period_ms is the time in ms to reach a load average of
254 0.5 for an idle task of 0 load average ratio that start a busy loop.
255 The up_threshold and down_threshold is the value to go to a faster
256 CPU or to go back to a slower cpu.
257 The {up,down}_threshold are devided by 1024 before being compared
259 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
260 a running task with a load of 0 will be migrated to a bigger CPU after
261 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
263 This patch has the same behavior as changing the Y of the load
264 average computation to
265 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
266 but it remove intermadiate overflows in computation.
268 config HMP_FREQUENCY_INVARIANT_SCALE
269 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
270 depends on HMP_VARIABLE_SCALE && CPU_FREQ
272 Scales the current load contribution in line with the frequency
273 of the CPU that the task was executed on.
274 In this version, we use a simple linear scale derived from the
275 maximum frequency reported by CPUFreq.
276 Restricting tracked load to be scaled by the CPU's frequency
277 represents the consumption of possible compute capacity
278 (rather than consumption of actual instantaneous capacity as
279 normal) and allows the HMP migration's simple threshold
280 migration strategy to interact more predictably with CPUFreq's
281 asynchronous compute capacity changes.
283 config SCHED_HMP_LITTLE_PACKING
284 bool "Small task packing for HMP"
288 Allows the HMP Scheduler to pack small tasks into CPUs in the
290 Controlled by two sysfs files in sys/kernel/hmp.
291 packing_enable: 1 to enable, 0 to disable packing. Default 1.
292 packing_limit: runqueue load ratio where a RQ is considered
293 to be full. Default is NICE_0_LOAD * 9/8.
296 int "Maximum number of CPUs (2-32)"
299 # These have to remain sorted largest to smallest
303 bool "Support for hot-pluggable CPUs"
306 Say Y here to experiment with turning CPUs off and on. CPUs
307 can be controlled through /sys/devices/system/cpu.
309 source kernel/Kconfig.preempt
315 config ARCH_HAS_HOLES_MEMORYMODEL
316 def_bool y if SPARSEMEM
318 config ARCH_SPARSEMEM_ENABLE
320 select SPARSEMEM_VMEMMAP_ENABLE
322 config ARCH_SPARSEMEM_DEFAULT
323 def_bool ARCH_SPARSEMEM_ENABLE
325 config ARCH_SELECT_MEMORY_MODEL
326 def_bool ARCH_SPARSEMEM_ENABLE
328 config HAVE_ARCH_PFN_VALID
329 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
331 config HW_PERF_EVENTS
332 bool "Enable hardware performance counter support for perf events"
333 depends on PERF_EVENTS
336 Enable hardware performance counter support for perf events. If
337 disabled, perf events will use software events only.
339 config SYS_SUPPORTS_HUGETLBFS
342 config ARCH_WANT_GENERAL_HUGETLB
345 config ARCH_WANT_HUGE_PMD_SHARE
346 def_bool y if !ARM64_64K_PAGES
348 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
353 config FORCE_MAX_ZONEORDER
355 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
363 string "Default kernel command string"
366 Provide a set of default command-line options at build time by
367 entering them here. As a minimum, you should specify the the
368 root device (e.g. root=/dev/nfs).
371 bool "Always use the default kernel command string"
373 Always use the default kernel command string, even if the boot
374 loader passes other arguments to the kernel.
375 This is useful if you cannot or don't want to change the
376 command-line options your boot loader passes to the kernel.
379 bool "UEFI runtime support"
380 depends on OF && !CPU_BIG_ENDIAN
383 select EFI_PARAMS_FROM_FDT
386 This option provides support for runtime services provided
387 by UEFI firmware (such as non-volatile variables, realtime
388 clock, and platform reset). A UEFI stub is also provided to
389 allow the kernel to be booted as an EFI application. This
390 is only useful on systems that have UEFI firmware.
394 menu "Userspace binary formats"
396 source "fs/Kconfig.binfmt"
399 bool "Kernel support for 32-bit EL0"
400 depends on !ARM64_64K_PAGES
401 select COMPAT_BINFMT_ELF
403 select OLD_SIGSUSPEND3
404 select COMPAT_OLD_SIGACTION
406 This option enables support for a 32-bit EL0 running under a 64-bit
407 kernel at EL1. AArch32-specific components such as system calls,
408 the user helper functions, VFP support and the ptrace interface are
409 handled appropriately by the kernel.
411 If you want to execute 32-bit userspace applications, say Y.
413 config SYSVIPC_COMPAT
415 depends on COMPAT && SYSVIPC
419 menu "Power management options"
421 source "kernel/power/Kconfig"
423 source "drivers/cpufreq/Kconfig"
424 config ARCH_SUSPEND_POSSIBLE
427 config ARM64_CPU_SUSPEND
432 menu "CPU Power Management"
434 source "drivers/cpuidle/Kconfig"
440 source "drivers/Kconfig"
442 source "drivers/firmware/Kconfig"
446 source "arch/arm64/kvm/Kconfig"
448 source "arch/arm64/Kconfig.debug"
450 source "security/Kconfig"
452 source "crypto/Kconfig"
454 source "arch/arm64/crypto/Kconfig"