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 ILLEGAL_POINTER_VALUE
91 default 0xdead000000000000
93 config LOCKDEP_SUPPORT
96 config TRACE_IRQFLAGS_SUPPORT
99 config RWSEM_XCHGADD_ALGORITHM
102 config GENERIC_HWEIGHT
108 config GENERIC_CALIBRATE_DELAY
114 config ARCH_DMA_ADDR_T_64BIT
117 config NEED_DMA_MAP_STATE
120 config NEED_SG_DMA_LENGTH
129 config FIX_EARLYCON_MEM
132 source "init/Kconfig"
134 source "kernel/Kconfig.freezer"
136 menu "Platform selection"
139 bool "ARMv8 software model (Versatile Express)"
140 select ARCH_REQUIRE_GPIOLIB
141 select COMMON_CLK_VERSATILE
142 select POWER_RESET_VEXPRESS
143 select VEXPRESS_CONFIG
145 This enables support for the ARMv8 software model (Versatile
149 bool "AppliedMicro X-Gene SOC Family"
151 This enables support for AppliedMicro X-Gene SOC Family
162 menu "Kernel Features"
164 menu "ARM errata workarounds"
166 config ARM64_ERRATUM_845719
167 bool "Cortex-A53: 845719: a load might read incorrect data"
171 This option adds an alternative code sequence to work around ARM
172 erratum 845719 on Cortex-A53 parts up to r0p4.
174 When running a compat (AArch32) userspace on an affected Cortex-A53
175 part, a load at EL0 from a virtual address that matches the bottom 32
176 bits of the virtual address used by a recent load at (AArch64) EL1
177 might return incorrect data.
179 The workaround is to write the contextidr_el1 register on exception
180 return to a 32-bit task.
181 Please note that this does not necessarily enable the workaround,
182 as it depends on the alternative framework, which will only patch
183 the kernel if an affected CPU is detected.
190 config ARM64_64K_PAGES
191 bool "Enable 64KB pages support"
193 This feature enables 64KB pages support (4KB by default)
194 allowing only two levels of page tables and faster TLB
195 look-up. AArch32 emulation is not available when this feature
198 config CPU_BIG_ENDIAN
199 bool "Build big-endian kernel"
201 Say Y if you plan on running a kernel in big-endian mode.
204 bool "Symmetric Multi-Processing"
205 select USE_GENERIC_SMP_HELPERS
207 This enables support for systems with more than one CPU. If
208 you say N here, the kernel will run on single and
209 multiprocessor machines, but will use only one CPU of a
210 multiprocessor machine. If you say Y here, the kernel will run
211 on many, but not all, single processor machines. On a single
212 processor machine, the kernel will run faster if you say N
215 If you don't know what to do here, say N.
218 bool "Multi-core scheduler support"
221 Multi-core scheduler support improves the CPU scheduler's decision
222 making when dealing with multi-core CPU chips at a cost of slightly
223 increased overhead in some places. If unsure say N here.
226 bool "SMT scheduler support"
229 Improves the CPU scheduler's decision making when dealing with
230 MultiThreading at a cost of slightly increased overhead in some
231 places. If unsure say N here.
233 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
234 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
236 Disables scheduler load-balancing at CPU sched domain level.
239 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
240 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
242 Experimental scheduler optimizations for heterogeneous platforms.
243 Attempts to introspectively select task affinity to optimize power
244 and performance. Basic support for multiple (>2) cpu types is in place,
245 but it has only been tested with two types of cpus.
246 There is currently no support for migration of task groups, hence
247 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
248 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
250 config SCHED_HMP_PRIO_FILTER
251 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
254 Enables task priority based HMP migration filter. Any task with
255 a NICE value above the threshold will always be on low-power cpus
256 with less compute capacity.
258 config SCHED_HMP_PRIO_FILTER_VAL
259 int "NICE priority threshold"
261 depends on SCHED_HMP_PRIO_FILTER
263 config HMP_FAST_CPU_MASK
264 string "HMP scheduler fast CPU mask"
267 Leave empty to use device tree information.
268 Specify the cpuids of the fast CPUs in the system as a list string,
269 e.g. cpuid 0+1 should be specified as 0-1.
271 config HMP_SLOW_CPU_MASK
272 string "HMP scheduler slow CPU mask"
275 Leave empty to use device tree information.
276 Specify the cpuids of the slow CPUs in the system as a list string,
277 e.g. cpuid 0+1 should be specified as 0-1.
279 config HMP_VARIABLE_SCALE
280 bool "Allows changing the load tracking scale through sysfs"
283 When turned on, this option exports the thresholds and load average
284 period value for the load tracking patches through sysfs.
285 The values can be modified to change the rate of load accumulation
286 and the thresholds used for HMP migration.
287 The load_avg_period_ms is the time in ms to reach a load average of
288 0.5 for an idle task of 0 load average ratio that start a busy loop.
289 The up_threshold and down_threshold is the value to go to a faster
290 CPU or to go back to a slower cpu.
291 The {up,down}_threshold are devided by 1024 before being compared
293 For examples, with load_avg_period_ms = 128 and up_threshold = 512,
294 a running task with a load of 0 will be migrated to a bigger CPU after
295 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
297 This patch has the same behavior as changing the Y of the load
298 average computation to
299 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
300 but it remove intermadiate overflows in computation.
302 config HMP_FREQUENCY_INVARIANT_SCALE
303 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
304 depends on HMP_VARIABLE_SCALE && CPU_FREQ
306 Scales the current load contribution in line with the frequency
307 of the CPU that the task was executed on.
308 In this version, we use a simple linear scale derived from the
309 maximum frequency reported by CPUFreq.
310 Restricting tracked load to be scaled by the CPU's frequency
311 represents the consumption of possible compute capacity
312 (rather than consumption of actual instantaneous capacity as
313 normal) and allows the HMP migration's simple threshold
314 migration strategy to interact more predictably with CPUFreq's
315 asynchronous compute capacity changes.
317 config SCHED_HMP_LITTLE_PACKING
318 bool "Small task packing for HMP"
322 Allows the HMP Scheduler to pack small tasks into CPUs in the
324 Controlled by two sysfs files in sys/kernel/hmp.
325 packing_enable: 1 to enable, 0 to disable packing. Default 1.
326 packing_limit: runqueue load ratio where a RQ is considered
327 to be full. Default is NICE_0_LOAD * 9/8.
330 int "Maximum number of CPUs (2-32)"
333 # These have to remain sorted largest to smallest
337 bool "Support for hot-pluggable CPUs"
340 Say Y here to experiment with turning CPUs off and on. CPUs
341 can be controlled through /sys/devices/system/cpu.
343 source kernel/Kconfig.preempt
349 config ARCH_HAS_HOLES_MEMORYMODEL
350 def_bool y if SPARSEMEM
352 config ARCH_SPARSEMEM_ENABLE
354 select SPARSEMEM_VMEMMAP_ENABLE
356 config ARCH_SPARSEMEM_DEFAULT
357 def_bool ARCH_SPARSEMEM_ENABLE
359 config ARCH_SELECT_MEMORY_MODEL
360 def_bool ARCH_SPARSEMEM_ENABLE
362 config HAVE_ARCH_PFN_VALID
363 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
365 config HW_PERF_EVENTS
366 bool "Enable hardware performance counter support for perf events"
367 depends on PERF_EVENTS
370 Enable hardware performance counter support for perf events. If
371 disabled, perf events will use software events only.
373 config SYS_SUPPORTS_HUGETLBFS
376 config ARCH_WANT_GENERAL_HUGETLB
379 config ARCH_WANT_HUGE_PMD_SHARE
380 def_bool y if !ARM64_64K_PAGES
382 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
387 config FORCE_MAX_ZONEORDER
389 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
397 string "Default kernel command string"
400 Provide a set of default command-line options at build time by
401 entering them here. As a minimum, you should specify the the
402 root device (e.g. root=/dev/nfs).
405 bool "Always use the default kernel command string"
407 Always use the default kernel command string, even if the boot
408 loader passes other arguments to the kernel.
409 This is useful if you cannot or don't want to change the
410 command-line options your boot loader passes to the kernel.
413 bool "UEFI runtime support"
414 depends on OF && !CPU_BIG_ENDIAN
417 select EFI_PARAMS_FROM_FDT
420 This option provides support for runtime services provided
421 by UEFI firmware (such as non-volatile variables, realtime
422 clock, and platform reset). A UEFI stub is also provided to
423 allow the kernel to be booted as an EFI application. This
424 is only useful on systems that have UEFI firmware.
428 menu "Userspace binary formats"
430 source "fs/Kconfig.binfmt"
433 bool "Kernel support for 32-bit EL0"
434 depends on !ARM64_64K_PAGES
435 select COMPAT_BINFMT_ELF
437 select OLD_SIGSUSPEND3
438 select COMPAT_OLD_SIGACTION
440 This option enables support for a 32-bit EL0 running under a 64-bit
441 kernel at EL1. AArch32-specific components such as system calls,
442 the user helper functions, VFP support and the ptrace interface are
443 handled appropriately by the kernel.
445 If you want to execute 32-bit userspace applications, say Y.
447 config SYSVIPC_COMPAT
449 depends on COMPAT && SYSVIPC
453 menu "Power management options"
455 source "kernel/power/Kconfig"
457 source "drivers/cpufreq/Kconfig"
458 config ARCH_SUSPEND_POSSIBLE
461 config ARM64_CPU_SUSPEND
466 menu "CPU Power Management"
468 source "drivers/cpuidle/Kconfig"
474 source "drivers/Kconfig"
476 source "drivers/firmware/Kconfig"
480 source "arch/arm64/kvm/Kconfig"
482 source "arch/arm64/Kconfig.debug"
484 source "security/Kconfig"
486 source "crypto/Kconfig"
488 source "arch/arm64/crypto/Kconfig"