Lines Matching +full:embedded +full:- +full:trace +full:- +full:extension
1 # SPDX-License-Identifier: GPL-2.0-only
8 - Re-run Kconfig when the compiler is updated
13 - Ensure full rebuild when the compiler is updated
14 include/linux/compiler-version.h contains this option in the comment
16 auto-generated dependency. When the compiler is updated, syncconfig
20 def_bool $(success,test "$(cc-name)" = GCC)
24 default $(cc-version) if CC_IS_GCC
28 def_bool $(success,test "$(cc-name)" = Clang)
32 default $(cc-version) if CC_IS_CLANG
36 def_bool $(success,test "$(as-name)" = GNU)
39 def_bool $(success,test "$(as-name)" = LLVM)
45 default $(as-version)
48 def_bool $(success,test "$(ld-name)" = BFD)
52 default $(ld-version) if LD_IS_BFD
56 def_bool $(success,test "$(ld-name)" = LLD)
60 default $(ld-version) if LD_IS_LLD
65 default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m64-flag)) if 64BIT
66 default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m32-flag))
70 …default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m64-flag) -static) if 6…
71 default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m32-flag) -static)
74 def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
78 …nt x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
81 …env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
84 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
87 … '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
134 drivers to compile-test them.
145 enables the '-Werror' flag to enforce that rule by default.
158 Compile test headers exported to user-space to ensure they are
159 self-contained, i.e. compilable as standalone units.
162 headers are self-contained, say Y here. Otherwise, choose N.
165 string "Local version - append to kernel release"
183 A string of the format -gxxxxxxxx will be added to the localversion
184 if a git-based tree is found. The string generated by this will be
191 $ git rev-parse --verify HEAD
233 The linux kernel is a kind of self-extracting executable.
245 are low on disk space (embedded systems), but for whom ram
283 filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
302 LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
376 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
496 this also enables accounting of stolen time on logically-partitioned
509 kernel-user boundaries using the context tracking subsystem.
596 bool "Enable per-task delay accounting"
617 bool "Enable per-task storage I/O accounting"
655 common scheduling-intense workloads in practice (such as
690 on-disk kernel. This information can be extracted from the kernel
691 image file with the script scripts/extract-ikconfig and used as
707 This option enables access to the in-kernel headers that are generated during
710 kheaders.ko is built which can be loaded on-demand to get access to headers.
769 int "Temporary per-CPU printk log buffer size (12 => 4KB, 13 => 8KB)"
774 Select the size of an alternate printk per-CPU buffer where messages
776 be NMI messages, another one - printk recursion. The messages are
844 the precision of clamping aggregation and tracking at run-time.
850 If a second 30% boosted task should be co-scheduled on the same CPU,
861 clamp buckets to trade off used memory for run-time tracking
869 # For architectures that want to enable the support for NUMA-affine scheduler
886 def_bool !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0) && 64BIT
895 # all cpu-local but of different latencies, such as SuperH.
928 - Documentation/scheduler/sched-design-CFS.rst (CFS)
929 - Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation
976 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
1006 See Documentation/scheduler/sched-bwc.rst for more information.
1015 schedule realtime tasks for non-root users until you allocate
1017 See Documentation/scheduler/sched-rt-group.rst for more information.
1037 specified task-specific clamp value is constrained by the cgroup
1076 controller includes important in-kernel memory consumers per default.
1128 This option extends the perf per-cpu mode to restrict monitoring
1160 /Documentation/admin-guide/cgroup-v2.rst.
1224 user-space use the memory control groups to limit the amount
1311 bool "Kernel->user space relay support (formerly relayfs)"
1329 etc. See <file:Documentation/admin-guide/initrd.rst> for details.
1348 complemental extension of kernel cmdline when booting.
1351 See <file:Documentation/admin-guide/bootconfig.rst> for details.
1360 bool "Optimize for performance (-O2)"
1363 with the "-O2" compiler flag for best performance and most
1364 helpful compile-time warnings.
1367 bool "Optimize more for performance (-O3)"
1370 Choosing this option will pass "-O3" to your compiler to optimize
1374 bool "Optimize for size (-Os)"
1376 Choosing this option will pass "-Os" to your compiler resulting
1395 depends on $(cc-option,-ffunction-sections -fdata-sections)
1396 depends on $(ld-option,--gc-sections)
1399 the linker by compiling with -ffunction-sections -fdata-sections,
1400 and linking with --gc-sections.
1402 This can reduce on disk and in-memory size of the kernel
1413 depends on $(ld-option,--orphan-handling=warn)
1424 Enable support for /proc/sys/debug/exception-trace.
1429 Enable support for /proc/sys/kernel/ignore-unaligned-usertrap
1436 Enable support for /proc/sys/kernel/unaligned-trap
1450 # Unhide debug options, to make the on-by-default options visible
1455 environments which can tolerate a "non-standard" kernel.
1459 bool "Enable 16-bit UID system calls" if EXPERT
1463 This enables the legacy 16-bit UID syscall wrappers.
1469 This option enables support for non-root users, groups and
1517 Some embedded systems have no use for them and therefore they
1547 option for embedded systems with no facilities for reporting errors.
1559 bool "Enable PC-Speaker support" if EXPERT
1564 This option allows to disable the internal PC-Speaker
1569 bool "Enable full-sized data structures for core" if EXPERT
1582 run glibc-based applications correctly.
1665 usage, improving performance. If building an embedded system where no
1685 the cost of user-space memory barriers asymmetrically by transforming
1727 emit the symbol references in the kallsyms table as 32-bit entries,
1734 On 64-bit builds, this reduces the size of the address table by 50%,
1760 user-space with the ability to compare two processes to see if they
1773 user-space cache for the current CPU number value, which
1774 speeds up getting the current CPU number from user-space,
1775 as well as an ABI to speed up user-space operations on
1776 per-CPU data.
1789 config EMBEDDED config
1790 bool "Embedded system"
1794 an embedded system so certain expert options are available
1826 Software events are supported either built-in or via the
1832 suffered, or branches mis-predicted - without slowing down the
1834 when a threshold number of events have passed - and can thus be
1889 On non-ancient distros (post-2000 ones) N is usually a safe choice.
1956 sanity-checking than others. This option is most effective with
1964 utilization of a direct-mapped memory-side-cache. See section
1967 the presence of a memory-side-cache. There are also incidental
1970 default granularity of shuffling on the "MAX_ORDER - 1" i.e,
1977 after runtime detection of a direct-mapped memory-side-cache.
2007 ELF-FDPIC binfmt's brk and stack allocator.
2010 enabled on embedded devices where you control what is run in
2011 userspace. Since that isn't generally a problem on no-MMU systems,
2014 See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
2091 --force). Forced module loading sets the 'F' (forced) taint flag and
2108 without waiting for anyone to stop using it (using the -f option to
2151 <file:Documentation/admin-guide/module-signing.rst>.
2159 another LSM - otherwise unsigned modules will be loadable regardless
2180 modules must be signed manually, using the scripts/sign-file tool.
2182 comment "Do not forget to sign required modules with scripts/sign-file"
2196 bool "Sign modules with SHA-1"
2200 bool "Sign modules with SHA-224"
2204 bool "Sign modules with SHA-256"
2208 bool "Sign modules with SHA-384"
2212 bool "Sign modules with SHA-512"
2242 corresponding algorithm. module-init-tools MAY support gzip, and kmod
2315 If unsure, or if you need to build out-of-tree modules, say N.
2321 By default, all unused exported symbols will be un-exported from the
2325 exported at all times, even in absence of in-tree users. The value to
2374 # macros for not-implemented syscalls in kernel/sys_ni.c and
2375 # kernel/time/posix-stubs.c. All these overrides need to be available in