1 # Copyright (C) 2006-2014 OpenWrt.org
3 # This is free software, licensed under the GNU General Public License v2.
4 # See /LICENSE for more information.
7 config KERNEL_BUILD_USER
8 string "Custom Kernel Build User Name"
11 Sets the Kernel build user string, which for example will be returned
12 by 'uname -a' on running systems.
13 If not set, uses system user at build time.
15 config KERNEL_BUILD_DOMAIN
16 string "Custom Kernel Build Domain Name"
19 Sets the Kernel build domain string, which for example will be
20 returned by 'uname -a' on running systems.
21 If not set, uses system hostname at build time.
24 bool "Enable support for printk"
27 config KERNEL_CRASHLOG
29 depends on !(arm || powerpc || sparc || TARGET_uml)
33 bool "Support for paging of anonymous memory (swap)"
36 config KERNEL_DEBUG_FS
37 bool "Compile the kernel with debug filesystem enabled"
40 debugfs is a virtual file system that kernel developers use to put
41 debugging files into. Enable this option to be able to read and
42 write to these files. Many common debugging facilities, such as
43 ftrace, require the existence of debugfs.
48 depends on (arm || arm64)
50 config KERNEL_PERF_EVENTS
53 select KERNEL_ARM_PMU if (arm || arm64)
55 config KERNEL_PROFILING
56 bool "Compile the kernel with profiling enabled"
58 select KERNEL_PERF_EVENTS
60 Enable the extended profiling support mechanisms used by profilers such
63 config KERNEL_KALLSYMS
64 bool "Compile the kernel with symbol table information"
65 default y if !SMALL_FLASH
67 This will give you more information in stack traces from kernel oopses.
70 bool "Compile the kernel with tracing support"
71 depends on !TARGET_uml
74 config KERNEL_FTRACE_SYSCALLS
75 bool "Trace system calls"
76 depends on KERNEL_FTRACE
79 config KERNEL_ENABLE_DEFAULT_TRACERS
80 bool "Trace process context switches and events"
81 depends on KERNEL_FTRACE
84 config KERNEL_FUNCTION_TRACER
85 bool "Function tracer"
86 depends on KERNEL_FTRACE
89 config KERNEL_FUNCTION_GRAPH_TRACER
90 bool "Function graph tracer"
91 depends on KERNEL_FUNCTION_TRACER
94 config KERNEL_DYNAMIC_FTRACE
95 bool "Enable/disable function tracing dynamically"
96 depends on KERNEL_FUNCTION_TRACER
99 config KERNEL_FUNCTION_PROFILER
100 bool "Function profiler"
101 depends on KERNEL_FUNCTION_TRACER
104 config KERNEL_DEBUG_KERNEL
108 config KERNEL_DEBUG_INFO
109 bool "Compile the kernel with debug information"
111 select KERNEL_DEBUG_KERNEL
113 This will compile your kernel and modules with debug information.
115 config KERNEL_DEBUG_LL_UART_NONE
120 config KERNEL_DEBUG_LL
124 select KERNEL_DEBUG_LL_UART_NONE
126 ARM low level debugging.
128 config KERNEL_DYNAMIC_DEBUG
129 bool "Compile the kernel with dynamic printk"
130 select KERNEL_DEBUG_FS
133 Compiles debug level messages into the kernel, which would not
134 otherwise be available at runtime. These messages can then be
135 enabled/disabled based on various levels of scope - per source file,
136 function, module, format string, and line number. This mechanism
137 implicitly compiles in all pr_debug() and dev_dbg() calls, which
138 enlarges the kernel text size by about 2%.
140 config KERNEL_EARLY_PRINTK
141 bool "Compile the kernel with early printk"
142 default y if TARGET_bcm53xx
145 select KERNEL_DEBUG_KERNEL
146 select KERNEL_DEBUG_LL if arm
148 Compile the kernel with early printk support. This is only useful for
149 debugging purposes to send messages over the serial console in early boot.
150 Enable this to debug early boot problems.
152 config KERNEL_KPROBES
153 bool "Compile the kernel with kprobes support"
156 select KERNEL_PERF_EVENTS
158 Compiles the kernel with KPROBES support, which allows you to trap
159 at almost any kernel address and execute a callback function.
160 register_kprobe() establishes a probepoint and specifies the
161 callback. Kprobes is useful for kernel debugging, non-intrusive
162 instrumentation and testing.
163 If in doubt, say "N".
165 config KERNEL_KPROBE_EVENT
167 default y if KERNEL_KPROBES
170 bool "Compile the kernel with asynchronous IO support"
173 config KERNEL_DIRECT_IO
174 bool "Compile the kernel with direct IO support"
177 config KERNEL_FHANDLE
178 bool "Compile the kernel with support for fhandle syscalls"
181 config KERNEL_FANOTIFY
182 bool "Compile the kernel with modern file notification support"
185 config KERNEL_BLK_DEV_BSG
186 bool "Compile the kernel with SCSI generic v4 support for any block device"
189 config KERNEL_MAGIC_SYSRQ
190 bool "Compile the kernel with SysRq support"
193 config KERNEL_DEBUG_PINCTRL
194 bool "Compile the kernel with pinctrl debugging"
195 select KERNEL_DEBUG_KERNEL
197 config KERNEL_DEBUG_GPIO
198 bool "Compile the kernel with gpio debugging"
199 select KERNEL_DEBUG_KERNEL
201 config KERNEL_COREDUMP
204 config KERNEL_ELF_CORE
205 bool "Enable process core dump support"
206 select KERNEL_COREDUMP
209 config KERNEL_PROVE_LOCKING
210 bool "Enable kernel lock checking"
211 select KERNEL_DEBUG_KERNEL
214 config KERNEL_PRINTK_TIME
215 bool "Enable printk timestamps"
218 config KERNEL_SLUB_DEBUG
221 config KERNEL_SLUB_DEBUG_ON
224 config KERNEL_SLABINFO
225 select KERNEL_SLUB_DEBUG
226 select KERNEL_SLUB_DEBUG_ON
227 bool "Enable /proc slab debug info"
229 config KERNEL_PROC_PAGE_MONITOR
230 bool "Enable /proc page monitoring"
236 bool "Enable kexec support"
239 bool "Enable rfkill support"
240 default RFKILL_SUPPORT
243 bool "Enable sparse check during kernel build"
246 config KERNEL_DEVTMPFS
247 bool "Compile the kernel with device tmpfs enabled"
250 devtmpfs is a simple, kernel-managed /dev filesystem. The kernel creates
251 devices nodes for all registered devices ti simplify boot, but leaves more
252 complex tasks to userspace (e.g. udev).
256 config KERNEL_DEVTMPFS_MOUNT
257 bool "Automatically mount devtmpfs after root filesystem is mounted"
263 bool "Enable kernel access key retention support"
266 config KERNEL_PERSISTENT_KEYRINGS
267 bool "Enable kernel persistent keyrings"
268 depends on KERNEL_KEYS
271 config KERNEL_BIG_KEYS
272 bool "Enable large payload keys on kernel keyrings"
273 depends on KERNEL_KEYS
276 config KERNEL_ENCRYPTED_KEYS
277 tristate "Enable keys with encrypted payloads on kernel keyrings"
278 depends on KERNEL_KEYS
282 # CGROUP support symbols
285 config KERNEL_CGROUPS
286 bool "Enable kernel cgroups"
291 config KERNEL_CGROUP_DEBUG
292 bool "Example debug cgroup subsystem"
295 This option enables a simple cgroup subsystem that
296 exports useful debugging information about the cgroups
299 config KERNEL_FREEZER
301 default y if KERNEL_CGROUP_FREEZER
303 config KERNEL_CGROUP_FREEZER
304 bool "Freezer cgroup subsystem"
307 Provides a way to freeze and unfreeze all tasks in a
310 config KERNEL_CGROUP_DEVICE
311 bool "Device controller for cgroups"
314 Provides a cgroup implementing whitelists for devices which
315 a process in the cgroup can mknod or open.
317 config KERNEL_CGROUP_PIDS
318 bool "PIDs cgroup subsystem"
321 Provides enforcement of process number limits in the scope of a
324 config KERNEL_CPUSETS
325 bool "Cpuset support"
328 This option will let you create and manage CPUSETs which
329 allow dynamically partitioning a system into sets of CPUs and
330 Memory Nodes and assigning tasks to run only within those sets.
331 This is primarily useful on large SMP or NUMA systems.
333 config KERNEL_PROC_PID_CPUSET
334 bool "Include legacy /proc/<pid>/cpuset file"
336 depends on KERNEL_CPUSETS
338 config KERNEL_CGROUP_CPUACCT
339 bool "Simple CPU accounting cgroup subsystem"
342 Provides a simple Resource Controller for monitoring the
343 total CPU consumed by the tasks in a cgroup.
345 config KERNEL_RESOURCE_COUNTERS
346 bool "Resource counters"
349 This option enables controller independent resource accounting
350 infrastructure that works with cgroups.
352 config KERNEL_MM_OWNER
354 default y if KERNEL_MEMCG
357 bool "Memory Resource Controller for Control Groups"
359 depends on KERNEL_RESOURCE_COUNTERS || !LINUX_3_18
361 Provides a memory resource controller that manages both anonymous
362 memory and page cache. (See Documentation/cgroups/memory.txt)
364 Note that setting this option increases fixed memory overhead
365 associated with each page of memory in the system. By this,
366 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
367 usage tracking struct at boot. Total amount of this is printed out
370 Only enable when you're ok with these tradeoffs and really
371 sure you need the memory resource controller. Even when you enable
372 this, you can set "cgroup_disable=memory" at your boot option to
373 disable memory resource controller and you can avoid overheads
374 (but lose benefits of memory resource controller).
376 This config option also selects MM_OWNER config option, which
377 could in turn add some fork/exit overhead.
379 config KERNEL_MEMCG_SWAP
380 bool "Memory Resource Controller Swap Extension"
382 depends on KERNEL_MEMCG
384 Add swap management feature to memory resource controller. When you
385 enable this, you can limit mem+swap usage per cgroup. In other words,
386 when you disable this, memory resource controller has no cares to
387 usage of swap...a process can exhaust all of the swap. This extension
388 is useful when you want to avoid exhaustion swap but this itself
389 adds more overheads and consumes memory for remembering information.
390 Especially if you use 32bit system or small memory system, please
391 be careful about enabling this. When memory resource controller
392 is disabled by boot option, this will be automatically disabled and
393 there will be no overhead from this. Even when you set this config=y,
394 if boot option "swapaccount=0" is set, swap will not be accounted.
395 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
396 size is 4096bytes, 512k per 1Gbytes of swap.
398 config KERNEL_MEMCG_SWAP_ENABLED
399 bool "Memory Resource Controller Swap Extension enabled by default"
401 depends on KERNEL_MEMCG_SWAP
403 Memory Resource Controller Swap Extension comes with its price in
404 a bigger memory consumption. General purpose distribution kernels
405 which want to enable the feature but keep it disabled by default
406 and let the user enable it by swapaccount boot command line
407 parameter should have this option unselected.
409 Those who want to have the feature enabled by default should
410 select this option (if, for some reason, they need to disable it,
411 then swapaccount=0 does the trick).
414 config KERNEL_MEMCG_KMEM
415 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
417 depends on KERNEL_MEMCG
419 The Kernel Memory extension for Memory Resource Controller can limit
420 the amount of memory used by kernel objects in the system. Those are
421 fundamentally different from the entities handled by the standard
422 Memory Controller, which are page-based, and can be swapped. Users of
423 the kmem extension can use it to guarantee that no group of processes
424 will ever exhaust kernel resources alone.
426 config KERNEL_CGROUP_PERF
427 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
428 select KERNEL_PERF_EVENTS
431 This option extends the per-cpu mode to restrict monitoring to
432 threads which belong to the cgroup specified and run on the
435 menuconfig KERNEL_CGROUP_SCHED
436 bool "Group CPU scheduler"
439 This feature lets CPU scheduler recognize task groups and control CPU
440 bandwidth allocation to such task groups. It uses cgroups to group
443 if KERNEL_CGROUP_SCHED
445 config KERNEL_FAIR_GROUP_SCHED
446 bool "Group scheduling for SCHED_OTHER"
449 config KERNEL_CFS_BANDWIDTH
450 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
452 depends on KERNEL_FAIR_GROUP_SCHED
454 This option allows users to define CPU bandwidth rates (limits) for
455 tasks running within the fair group scheduler. Groups with no limit
456 set are considered to be unconstrained and will run with no
458 See tip/Documentation/scheduler/sched-bwc.txt for more information.
460 config KERNEL_RT_GROUP_SCHED
461 bool "Group scheduling for SCHED_RR/FIFO"
464 This feature lets you explicitly allocate real CPU bandwidth
465 to task groups. If enabled, it will also make it impossible to
466 schedule realtime tasks for non-root users until you allocate
467 realtime bandwidth for them.
471 config KERNEL_BLK_CGROUP
472 bool "Block IO controller"
475 Generic block IO controller cgroup interface. This is the common
476 cgroup interface which should be used by various IO controlling
479 Currently, CFQ IO scheduler uses it to recognize task groups and
480 control disk bandwidth allocation (proportional time slice allocation)
481 to such task groups. It is also used by bio throttling logic in
482 block layer to implement upper limit in IO rates on a device.
484 This option only enables generic Block IO controller infrastructure.
485 One needs to also enable actual IO controlling logic/policy. For
486 enabling proportional weight division of disk bandwidth in CFQ, set
487 CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
488 CONFIG_BLK_DEV_THROTTLING=y.
490 config KERNEL_DEBUG_BLK_CGROUP
491 bool "Enable Block IO controller debugging"
493 depends on KERNEL_BLK_CGROUP
495 Enable some debugging help. Currently it exports additional stat
496 files in a cgroup which can be useful for debugging.
498 config KERNEL_NET_CLS_CGROUP
499 bool "Control Group Classifier"
502 config KERNEL_NETPRIO_CGROUP
503 bool "Network priority cgroup"
509 # Namespace support symbols
512 config KERNEL_NAMESPACES
513 bool "Enable kernel namespaces"
522 In this namespace, tasks see different info provided
523 with the uname() system call.
529 In this namespace, tasks work with IPC ids which correspond to
530 different IPC objects in different namespaces.
532 config KERNEL_USER_NS
533 bool "User namespace (EXPERIMENTAL)"
536 This allows containers, i.e. vservers, to use user namespaces
537 to provide different user info for different servers.
540 bool "PID Namespaces"
543 Support process id namespaces. This allows having multiple
544 processes with the same pid as long as they are in different
545 pid namespaces. This is a building block of containers.
548 bool "Network namespace"
551 Allow user space to create what appear to be multiple instances
552 of the network stack.
557 # LXC related symbols
560 config KERNEL_LXC_MISC
561 bool "Enable miscellaneous LXC related options"
566 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
567 bool "Support multiple instances of devpts"
570 Enable support for multiple instances of devpts filesystem.
571 If you want to have isolated PTY namespaces (eg: in containers),
572 say Y here. Otherwise, say N. If enabled, each mount of devpts
573 filesystem with the '-o newinstance' option will create an
574 independent PTY namespace.
576 config KERNEL_POSIX_MQUEUE
577 bool "POSIX Message Queues"
580 POSIX variant of message queues is a part of IPC. In POSIX message
581 queues every message has a priority which decides about succession
582 of receiving it by a process. If you want to compile and run
583 programs written e.g. for Solaris with use of its POSIX message
584 queues (functions mq_*) say Y here.
586 POSIX message queues are visible as a filesystem called 'mqueue'
587 and can be mounted somewhere if you want to do filesystem
588 operations on message queues.
592 config KERNEL_SECCOMP_FILTER
596 config KERNEL_SECCOMP
597 bool "Enable seccomp support"
598 depends on !(TARGET_uml)
599 select KERNEL_SECCOMP_FILTER
602 Build kernel with support for seccomp.
613 config KERNEL_IPV6_MULTIPLE_TABLES
616 config KERNEL_IPV6_SUBTREES
619 config KERNEL_IPV6_MROUTE
622 config KERNEL_IPV6_PIMSM_V2
628 # NFS related symbols
631 bool "Compile the kernel with rootfs on NFS"
633 If you want to make your kernel boot off a NFS server as root
634 filesystem, select Y here.
638 config KERNEL_IP_PNP_DHCP
641 config KERNEL_IP_PNP_BOOTP
644 config KERNEL_IP_PNP_RARP
656 config KERNEL_ROOT_NFS
661 menu "Filesystem ACL and attr support options"
662 config USE_FS_ACL_ATTR
663 bool "Use filesystem ACL and attr support by default"
666 Make using ACLs (e.g. POSIX ACL, NFSv4 ACL) the default
667 for kernel and packages, except tmpfs, flash filesystems,
668 and old NFS. Also enable userspace extended attribute support
669 by default. (OpenWrt already has an expection it will be
670 present in the kernel).
672 config KERNEL_FS_POSIX_ACL
673 bool "Enable POSIX ACL support"
674 default y if USE_FS_ACL_ATTR
676 config KERNEL_BTRFS_FS_POSIX_ACL
677 bool "Enable POSIX ACL for BtrFS Filesystems"
678 select KERNEL_FS_POSIX_ACL
679 default y if USE_FS_ACL_ATTR
681 config KERNEL_EXT4_FS_POSIX_ACL
682 bool "Enable POSIX ACL for Ext4 Filesystems"
683 select KERNEL_FS_POSIX_ACL
684 default y if USE_FS_ACL_ATTR
686 config KERNEL_F2FS_FS_POSIX_ACL
687 bool "Enable POSIX ACL for F2FS Filesystems"
688 select KERNEL_FS_POSIX_ACL
691 config KERNEL_JFFS2_FS_POSIX_ACL
692 bool "Enable POSIX ACL for JFFS2 Filesystems"
693 select KERNEL_FS_POSIX_ACL
696 config KERNEL_TMPFS_POSIX_ACL
697 bool "Enable POSIX ACL for TMPFS Filesystems"
698 select KERNEL_FS_POSIX_ACL
701 config KERNEL_CIFS_ACL
702 bool "Enable CIFS ACLs"
703 select KERNEL_FS_POSIX_ACL
704 default y if USE_FS_ACL_ATTR
706 config KERNEL_HFS_FS_POSIX_ACL
707 bool "Enable POSIX ACL for HFS Filesystems"
708 select KERNEL_FS_POSIX_ACL
709 default y if USE_FS_ACL_ATTR
711 config KERNEL_HFSPLUG_FS_POSIX_ACL
712 bool "Enable POSIX ACL for HFS+ Filesystems"
713 select KERNEL_FS_POSIX_ACL
714 default y if USE_FS_ACL_ATTR
716 config KERNEL_NFS_ACL_SUPPORT
717 bool "Enable ACLs for NFS"
718 default y if USE_FS_ACL_ATTR
720 config KERNEL_NFS_V3_ACL_SUPPORT
721 bool "Enable ACLs for NFSv3"
724 config KERNEL_NFSD_V2_ACL_SUPPORT
725 bool "Enable ACLs for NFSDv2"
728 config KERNEL_NFSD_V3_ACL_SUPPORT
729 bool "Enable ACLs for NFSDv3"
732 config KERNEL_REISER_FS_POSIX_ACL
733 bool "Enable POSIX ACLs for ReiserFS"
734 select KERNEL_FS_POSIX_ACL
735 default y if USE_FS_ACL_ATTR
737 config KERNEL_XFS_POSIX_ACL
738 bool "Enable POSIX ACLs for XFS"
739 select KERNEL_FS_POSIX_ACL
740 default y if USE_FS_ACL_ATTR
742 config KERNEL_JFS_POSIX_ACL
743 bool "Enable POSIX ACLs for JFS"
744 select KERNEL_FS_POSIX_ACL
745 default y if USE_FS_ACL_ATTR