3 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
5 select ARCH_USE_CMPXCHG_LOCKREF
7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
8 select ARCH_SUPPORTS_ATOMIC_RMW
9 select ARCH_HAS_GCOV_PROFILE_ALL
10 select ARCH_WANT_OPTIONAL_GPIOLIB
11 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
12 select ARCH_WANT_FRAME_POINTERS
17 select BUILDTIME_EXTABLE_SORT
18 select CLONE_BACKWARDS
20 select CPU_PM if (SUSPEND || CPU_IDLE)
21 select DCACHE_WORD_ACCESS
22 select GENERIC_ALLOCATOR
23 select GENERIC_CLOCKEVENTS
24 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
25 select GENERIC_CPU_AUTOPROBE
26 select GENERIC_EARLY_IOREMAP
28 select GENERIC_IRQ_PROBE
29 select GENERIC_IRQ_SHOW
30 select GENERIC_SMP_IDLE_THREAD
31 select GENERIC_STRNCPY_FROM_USER
32 select GENERIC_STRNLEN_USER
33 select GENERIC_TIME_VSYSCALL
34 select HARDIRQS_SW_RESEND
35 select HAVE_ARCH_JUMP_LABEL
37 select HAVE_ARCH_TRACEHOOK
38 select HAVE_C_RECORDMCOUNT
39 select HAVE_CC_STACKPROTECTOR
40 select HAVE_DEBUG_BUGVERBOSE
41 select HAVE_DEBUG_KMEMLEAK
42 select HAVE_DMA_API_DEBUG
44 select HAVE_DMA_CONTIGUOUS
45 select HAVE_DYNAMIC_FTRACE
46 select HAVE_EFFICIENT_UNALIGNED_ACCESS
47 select HAVE_FTRACE_MCOUNT_RECORD
48 select HAVE_FUNCTION_TRACER
49 select HAVE_FUNCTION_GRAPH_TRACER
50 select HAVE_GENERIC_DMA_COHERENT
51 select HAVE_GENERIC_HARDIRQS
52 select HAVE_HW_BREAKPOINT if PERF_EVENTS
54 select HAVE_PATA_PLATFORM
55 select HAVE_PERF_EVENTS
57 select HAVE_PERF_USER_STACK_DUMP
58 select HAVE_SYSCALL_TRACEPOINTS
60 select MODULES_USE_ELF_RELA
63 select OF_EARLY_FLATTREE
64 select OF_RESERVED_MEM
65 select PERF_USE_VMALLOC
70 select SYSCTL_EXCEPTION_TRACE
72 ARM 64-bit (AArch64) Linux support.
77 config ARCH_PHYS_ADDR_T_64BIT
86 config STACKTRACE_SUPPORT
89 config LOCKDEP_SUPPORT
92 config TRACE_IRQFLAGS_SUPPORT
95 config RWSEM_XCHGADD_ALGORITHM
98 config GENERIC_HWEIGHT
104 config GENERIC_CALIBRATE_DELAY
110 config ARCH_DMA_ADDR_T_64BIT
113 config NEED_DMA_MAP_STATE
116 config NEED_SG_DMA_LENGTH
125 config FIX_EARLYCON_MEM
128 source "init/Kconfig"
130 source "kernel/Kconfig.freezer"
132 menu "Platform selection"
135 bool "ARMv8 software model (Versatile Express)"
136 select ARCH_REQUIRE_GPIOLIB
137 select COMMON_CLK_VERSATILE
138 select POWER_RESET_VEXPRESS
139 select VEXPRESS_CONFIG
141 This enables support for the ARMv8 software model (Versatile
145 bool "AppliedMicro X-Gene SOC Family"
147 This enables support for AppliedMicro X-Gene SOC Family
158 menu "Kernel Features"
160 config ARM64_64K_PAGES
161 bool "Enable 64KB pages support"
163 This feature enables 64KB pages support (4KB by default)
164 allowing only two levels of page tables and faster TLB
165 look-up. AArch32 emulation is not available when this feature
168 config CPU_BIG_ENDIAN
169 bool "Build big-endian kernel"
171 Say Y if you plan on running a kernel in big-endian mode.
174 bool "Symmetric Multi-Processing"
175 select USE_GENERIC_SMP_HELPERS
177 This enables support for systems with more than one CPU. If
178 you say N here, the kernel will run on single and
179 multiprocessor machines, but will use only one CPU of a
180 multiprocessor machine. If you say Y here, the kernel will run
181 on many, but not all, single processor machines. On a single
182 processor machine, the kernel will run faster if you say N
185 If you don't know what to do here, say N.
188 bool "Multi-core scheduler support"
191 Multi-core scheduler support improves the CPU scheduler's decision
192 making when dealing with multi-core CPU chips at a cost of slightly
193 increased overhead in some places. If unsure say N here.
196 bool "SMT scheduler support"
199 Improves the CPU scheduler's decision making when dealing with
200 MultiThreading at a cost of slightly increased overhead in some
201 places. If unsure say N here.
203 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
204 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
206 Disables scheduler load-balancing at CPU sched domain level.
209 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
210 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
212 Experimental scheduler optimizations for heterogeneous platforms.
213 Attempts to introspectively select task affinity to optimize power
214 and performance. Basic support for multiple (>2) cpu types is in place,
215 but it has only been tested with two types of cpus.
216 There is currently no support for migration of task groups, hence
217 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
218 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
220 config SCHED_HMP_PRIO_FILTER
221 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
224 Enables task priority based HMP migration filter. Any task with
225 a NICE value above the threshold will always be on low-power cpus
226 with less compute capacity.
228 config SCHED_HMP_PRIO_FILTER_VAL
229 int "NICE priority threshold"
231 depends on SCHED_HMP_PRIO_FILTER
233 config HMP_FAST_CPU_MASK
234 string "HMP scheduler fast CPU mask"
237 Leave empty to use device tree information.
238 Specify the cpuids of the fast CPUs in the system as a list string,
239 e.g. cpuid 0+1 should be specified as 0-1.
241 config HMP_SLOW_CPU_MASK
242 string "HMP scheduler slow CPU mask"
245 Leave empty to use device tree information.
246 Specify the cpuids of the slow CPUs in the system as a list string,
247 e.g. cpuid 0+1 should be specified as 0-1.
249 config HMP_VARIABLE_SCALE
250 bool "Allows changing the load tracking scale through sysfs"
253 When turned on, this option exports the thresholds and load average
254 period value for the load tracking patches through sysfs.
255 The values can be modified to change the rate of load accumulation
256 and the thresholds used for HMP migration.
257 The load_avg_period_ms is the time in ms to reach a load average of
258 0.5 for an idle task of 0 load average ratio that start a busy loop.
259 The up_threshold and down_threshold is the value to go to a faster
260 CPU or to go back to a slower cpu.
261 The {up,down}_threshold are devided by 1024 before being compared
263 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
264 a running task with a load of 0 will be migrated to a bigger CPU after
265 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
267 This patch has the same behavior as changing the Y of the load
268 average computation to
269 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
270 but it remove intermadiate overflows in computation.
272 config HMP_FREQUENCY_INVARIANT_SCALE
273 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
274 depends on HMP_VARIABLE_SCALE && CPU_FREQ
276 Scales the current load contribution in line with the frequency
277 of the CPU that the task was executed on.
278 In this version, we use a simple linear scale derived from the
279 maximum frequency reported by CPUFreq.
280 Restricting tracked load to be scaled by the CPU's frequency
281 represents the consumption of possible compute capacity
282 (rather than consumption of actual instantaneous capacity as
283 normal) and allows the HMP migration's simple threshold
284 migration strategy to interact more predictably with CPUFreq's
285 asynchronous compute capacity changes.
287 config SCHED_HMP_LITTLE_PACKING
288 bool "Small task packing for HMP"
292 Allows the HMP Scheduler to pack small tasks into CPUs in the
294 Controlled by two sysfs files in sys/kernel/hmp.
295 packing_enable: 1 to enable, 0 to disable packing. Default 1.
296 packing_limit: runqueue load ratio where a RQ is considered
297 to be full. Default is NICE_0_LOAD * 9/8.
300 int "Maximum number of CPUs (2-32)"
303 # These have to remain sorted largest to smallest
307 bool "Support for hot-pluggable CPUs"
310 Say Y here to experiment with turning CPUs off and on. CPUs
311 can be controlled through /sys/devices/system/cpu.
313 source kernel/Kconfig.preempt
319 config ARCH_HAS_HOLES_MEMORYMODEL
320 def_bool y if SPARSEMEM
322 config ARCH_SPARSEMEM_ENABLE
324 select SPARSEMEM_VMEMMAP_ENABLE
326 config ARCH_SPARSEMEM_DEFAULT
327 def_bool ARCH_SPARSEMEM_ENABLE
329 config ARCH_SELECT_MEMORY_MODEL
330 def_bool ARCH_SPARSEMEM_ENABLE
332 config HAVE_ARCH_PFN_VALID
333 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
335 config HW_PERF_EVENTS
336 bool "Enable hardware performance counter support for perf events"
337 depends on PERF_EVENTS
340 Enable hardware performance counter support for perf events. If
341 disabled, perf events will use software events only.
343 config SYS_SUPPORTS_HUGETLBFS
346 config ARCH_WANT_GENERAL_HUGETLB
349 config ARCH_WANT_HUGE_PMD_SHARE
350 def_bool y if !ARM64_64K_PAGES
352 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
357 config FORCE_MAX_ZONEORDER
359 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
367 string "Default kernel command string"
370 Provide a set of default command-line options at build time by
371 entering them here. As a minimum, you should specify the the
372 root device (e.g. root=/dev/nfs).
375 bool "Always use the default kernel command string"
377 Always use the default kernel command string, even if the boot
378 loader passes other arguments to the kernel.
379 This is useful if you cannot or don't want to change the
380 command-line options your boot loader passes to the kernel.
383 bool "UEFI runtime support"
384 depends on OF && !CPU_BIG_ENDIAN
387 select EFI_PARAMS_FROM_FDT
390 This option provides support for runtime services provided
391 by UEFI firmware (such as non-volatile variables, realtime
392 clock, and platform reset). A UEFI stub is also provided to
393 allow the kernel to be booted as an EFI application. This
394 is only useful on systems that have UEFI firmware.
398 menu "Userspace binary formats"
400 source "fs/Kconfig.binfmt"
403 bool "Kernel support for 32-bit EL0"
404 depends on !ARM64_64K_PAGES
405 select COMPAT_BINFMT_ELF
407 select OLD_SIGSUSPEND3
408 select COMPAT_OLD_SIGACTION
410 This option enables support for a 32-bit EL0 running under a 64-bit
411 kernel at EL1. AArch32-specific components such as system calls,
412 the user helper functions, VFP support and the ptrace interface are
413 handled appropriately by the kernel.
415 If you want to execute 32-bit userspace applications, say Y.
417 config SYSVIPC_COMPAT
419 depends on COMPAT && SYSVIPC
423 menu "Power management options"
425 source "kernel/power/Kconfig"
427 source "drivers/cpufreq/Kconfig"
428 config ARCH_SUSPEND_POSSIBLE
431 config ARM64_CPU_SUSPEND
436 menu "CPU Power Management"
438 source "drivers/cpuidle/Kconfig"
444 source "drivers/Kconfig"
446 source "drivers/firmware/Kconfig"
450 source "arch/arm64/kvm/Kconfig"
452 source "arch/arm64/Kconfig.debug"
454 source "security/Kconfig"
456 source "crypto/Kconfig"
458 source "arch/arm64/crypto/Kconfig"