diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 406 |
1 files changed, 329 insertions, 77 deletions
diff --git a/init/Kconfig b/init/Kconfig index febdea2afc3b..fa79feb8fe57 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -60,6 +60,13 @@ config LLD_VERSION default $(ld-version) if LD_IS_LLD default 0 +config RUSTC_VERSION + int + default $(rustc-version) + help + It does not depend on `RUST` since that one may need to use the version + in a `depends on`. + config RUST_IS_AVAILABLE def_bool $(success,$(srctree)/scripts/rust_is_available.sh) help @@ -71,42 +78,97 @@ config RUST_IS_AVAILABLE In particular, the Makefile target 'rustavailable' is useful to check why the Rust toolchain is not being detected. +config RUSTC_LLVM_VERSION + int + default $(rustc-llvm-version) + +config ARCH_HAS_CC_CAN_LINK + bool + config CC_CAN_LINK bool - default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag)) if 64BIT - default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m32-flag)) + default ARCH_CC_CAN_LINK if ARCH_HAS_CC_CAN_LINK + default $(cc_can_link_user,$(m64-flag)) if 64BIT + default $(cc_can_link_user,$(m32-flag)) -config CC_CAN_LINK_STATIC +# Fixed in GCC 14, 13.3, 12.4 and 11.5 +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921 +config GCC_ASM_GOTO_OUTPUT_BROKEN bool - default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag) -static) if 64BIT - default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m32-flag) -static) + depends on CC_IS_GCC + default y if GCC_VERSION < 110500 + default y if GCC_VERSION >= 120000 && GCC_VERSION < 120400 + default y if GCC_VERSION >= 130000 && GCC_VERSION < 130300 config CC_HAS_ASM_GOTO_OUTPUT - def_bool $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null) + def_bool y + depends on !GCC_ASM_GOTO_OUTPUT_BROKEN + # Detect basic support + depends on $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null) + # Detect clang (< v17) scoped label issues + depends on $(success,echo 'void b(void **);void* c(void);int f(void){{asm goto(""::::l0);return 0;l0:return 1;}void *x __attribute__((cleanup(b)))=c();{asm goto(""::::l1);return 2;l1:return 3;}}' | $(CC) -x c - -c -o /dev/null) config CC_HAS_ASM_GOTO_TIED_OUTPUT depends on CC_HAS_ASM_GOTO_OUTPUT # Detect buggy gcc and clang, fixed in gcc-11 clang-14. def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null) -config GCC_ASM_GOTO_OUTPUT_WORKAROUND - bool - depends on CC_IS_GCC && CC_HAS_ASM_GOTO_OUTPUT - # Fixed in GCC 14, 13.3, 12.4 and 11.5 - # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921 - default y if GCC_VERSION < 110500 - default y if GCC_VERSION >= 120000 && GCC_VERSION < 120400 - default y if GCC_VERSION >= 130000 && GCC_VERSION < 130300 - config TOOLS_SUPPORT_RELR def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh) config CC_HAS_ASM_INLINE def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null) +config CC_HAS_ASSUME + bool + # clang needs to be at least 19.1.0 since the meaning of the assume + # attribute changed: + # https://github.com/llvm/llvm-project/commit/c44fa3e8a9a44c2e9a575768a3c185354b9f6c17 + default y if CC_IS_CLANG && CLANG_VERSION >= 190100 + # supported since gcc 13.1.0 + # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106654 + default y if CC_IS_GCC && GCC_VERSION >= 130100 + config CC_HAS_NO_PROFILE_FN_ATTR def_bool $(success,echo '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror) +config CC_HAS_COUNTED_BY + bool + # clang needs to be at least 20.1.0 to avoid potential crashes + # when building structures that contain __counted_by + # https://github.com/ClangBuiltLinux/linux/issues/2114 + # https://github.com/llvm/llvm-project/commit/160fb1121cdf703c3ef5e61fb26c5659eb581489 + default y if CC_IS_CLANG && CLANG_VERSION >= 200100 + # supported since gcc 15.1.0 + # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896 + default y if CC_IS_GCC && GCC_VERSION >= 150100 + +config CC_HAS_MULTIDIMENSIONAL_NONSTRING + def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror) + +config LD_CAN_USE_KEEP_IN_OVERLAY + # ld.lld prior to 21.0.0 did not support KEEP within an overlay description + # https://github.com/llvm/llvm-project/pull/130661 + def_bool LD_IS_BFD || LLD_VERSION >= 210000 + +config RUSTC_HAS_SLICE_AS_FLATTENED + def_bool RUSTC_VERSION >= 108000 + +config RUSTC_HAS_COERCE_POINTEE + def_bool RUSTC_VERSION >= 108400 + +config RUSTC_HAS_SPAN_FILE + def_bool RUSTC_VERSION >= 108800 + +config RUSTC_HAS_UNNECESSARY_TRANSMUTES + def_bool RUSTC_VERSION >= 108800 + +config RUSTC_HAS_FILE_WITH_NUL + def_bool RUSTC_VERSION >= 108900 + +config RUSTC_HAS_FILE_AS_C_STR + def_bool RUSTC_VERSION >= 109100 + config PAHOLE_VERSION int default $(shell,$(srctree)/scripts/pahole-version.sh $(PAHOLE)) @@ -134,6 +196,10 @@ menu "General setup" config BROKEN bool + help + This option allows you to choose whether you want to try to + compile (and fix) old drivers that haven't been updated to + new infrastructure. config BROKEN_ON_SMP bool @@ -308,8 +374,9 @@ config KERNEL_XZ BCJ filters which can improve compression ratio of executable code. The size of the kernel is about 30% smaller with XZ in comparison to gzip. On architectures for which there is a BCJ - filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ - will create a few percent smaller kernel than plain LZMA. + filter (i386, x86_64, ARM, ARM64, RISC-V, big endian PowerPC, + and SPARC), XZ will create a few percent smaller kernel than + plain LZMA. The speed is about the same as with LZMA: The decompression speed of XZ is better than that of bzip2 but worse than gzip @@ -445,16 +512,6 @@ config CROSS_MEMORY_ATTACH to directly read from or write to another process' address space. See the man page for more details. -config USELIB - bool "uselib syscall (for libc5 and earlier)" - default ALPHA || M68K || SPARC - help - This option enables the uselib syscall, a system call used in the - dynamic linker from libc5 and earlier. glibc does not use this - system call. If you intend to run programs built on libc5 or - earlier, you may need to enable this syscall. Current systems - running glibc can safely disable this. - config AUDIT bool "Auditing support" depends on NET @@ -680,7 +737,7 @@ endmenu # "CPU/Task time and stats accounting" config CPU_ISOLATION bool "CPU isolation" - depends on SMP || COMPILE_TEST + depends on SMP default y help Make sure that CPUs running critical tasks are not disturbed by @@ -849,6 +906,18 @@ config UCLAMP_BUCKETS_COUNT If in doubt, use the default value. +config SCHED_PROXY_EXEC + bool "Proxy Execution" + # Avoid some build failures w/ PREEMPT_RT until it can be fixed + depends on !PREEMPT_RT + # Need to investigate how to inform sched_ext of split contexts + depends on !SCHED_CLASS_EXT + # Not particularly useful until we get to multi-rq proxying + depends on EXPERT + help + This option enables proxy execution, a mechanism for mutex-owning + tasks to inherit the scheduling context of higher priority waiters. + endmenu # @@ -966,14 +1035,41 @@ config MEMCG select PAGE_COUNTER select EVENTFD select SLAB_OBJ_EXT + select VM_EVENT_COUNTERS help Provides control over the memory footprint of tasks in a cgroup. -config MEMCG_KMEM +config MEMCG_NMI_UNSAFE bool depends on MEMCG + depends on HAVE_NMI + depends on !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && !ARCH_HAVE_NMI_SAFE_CMPXCHG default y +config MEMCG_NMI_SAFETY_REQUIRES_ATOMIC + bool + depends on MEMCG + depends on HAVE_NMI + depends on !ARCH_HAS_NMI_SAFE_THIS_CPU_OPS && ARCH_HAVE_NMI_SAFE_CMPXCHG + default y + +config MEMCG_V1 + bool "Legacy cgroup v1 memory controller" + depends on MEMCG + default n + help + Legacy cgroup v1 memory controller which has been deprecated by + cgroup v2 implementation. The v1 is there for legacy applications + which haven't migrated to the new cgroup v2 interface yet. If you + do not have any such application then you are completely fine leaving + this option disabled. + + Please note that feature set of the legacy memory controller is likely + going to shrink due to deprecation process. New deployments with v1 + controller are highly discouraged. + + Say N if unsure. + config BLK_CGROUP bool "IO controller" depends on BLOCK @@ -1010,14 +1106,22 @@ menuconfig CGROUP_SCHED tasks. if CGROUP_SCHED +config GROUP_SCHED_WEIGHT + def_bool n + +config GROUP_SCHED_BANDWIDTH + def_bool n + config FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER" depends on CGROUP_SCHED + select GROUP_SCHED_WEIGHT default CGROUP_SCHED config CFS_BANDWIDTH bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED" depends on FAIR_GROUP_SCHED + select GROUP_SCHED_BANDWIDTH default n help This option allows users to define CPU bandwidth rates (limits) for @@ -1037,6 +1141,24 @@ config RT_GROUP_SCHED realtime bandwidth for them. See Documentation/scheduler/sched-rt-group.rst for more information. +config RT_GROUP_SCHED_DEFAULT_DISABLED + bool "Require boot parameter to enable group scheduling for SCHED_RR/FIFO" + depends on RT_GROUP_SCHED + default n + help + When set, the RT group scheduling is disabled by default. The option + is in inverted form so that mere RT_GROUP_SCHED enables the group + scheduling. + + Say N if unsure. + +config EXT_GROUP_SCHED + bool + depends on SCHED_CLASS_EXT && CGROUP_SCHED + select GROUP_SCHED_WEIGHT + select GROUP_SCHED_BANDWIDTH + default y + endif #CGROUP_SCHED config SCHED_MM_CID @@ -1091,6 +1213,16 @@ config CGROUP_RDMA Attaching processes with active RDMA resources to the cgroup hierarchy is allowed even if can cross the hierarchy's limit. +config CGROUP_DMEM + bool "Device memory controller (DMEM)" + select PAGE_COUNTER + help + The DMEM controller allows compatible devices to restrict device + memory usage based on the cgroup hierarchy. + + As an example, it allows you to restrict VRAM usage for applications + in the DRM subsystem. + config CGROUP_FREEZER bool "Freezer controller" help @@ -1121,6 +1253,7 @@ config CGROUP_HUGETLB config CPUSETS bool "Cpuset controller" depends on SMP + select UNION_FIND help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and @@ -1129,9 +1262,23 @@ config CPUSETS Say N if unsure. +config CPUSETS_V1 + bool "Legacy cgroup v1 cpusets controller" + depends on CPUSETS + default n + help + Legacy cgroup v1 cpusets controller which has been deprecated by + cgroup v2 implementation. The v1 is there for legacy applications + which haven't migrated to the new cgroup v2 interface yet. Legacy + interface includes cpuset filesystem and /proc/<pid>/cpuset. If you + do not have any such application then you are completely fine leaving + this option disabled. + + Say N if unsure. + config PROC_PID_CPUSET bool "Include legacy /proc/<pid>/cpuset file" - depends on CPUSETS + depends on CPUSETS_V1 default y config CGROUP_DEVICE @@ -1223,7 +1370,7 @@ config UTS_NS config TIME_NS bool "TIME namespace" - depends on GENERIC_VDSO_TIME_NS + depends on GENERIC_GETTIMEOFDAY default y help In this namespace boottime and monotonic clocks can be set. @@ -1372,8 +1519,27 @@ config BOOT_CONFIG_EMBED_FILE This bootconfig will be used if there is no initrd or no other bootconfig in the initrd. +config CMDLINE_LOG_WRAP_IDEAL_LEN + int "Length to try to wrap the cmdline when logged at boot" + default 1021 + range 0 1021 + help + At boot time, the kernel command line is logged to the console. + The log message will start with the prefix "Kernel command line: ". + The log message will attempt to be wrapped (split into multiple log + messages) at spaces based on CMDLINE_LOG_WRAP_IDEAL_LEN characters. + If wrapping happens, each log message will start with the prefix and + all but the last message will end with " \". Messages may exceed the + ideal length if a place to wrap isn't found before the specified + number of characters. + + A value of 0 disables wrapping, though be warned that the maximum + length of a log message (1021 characters) may cause the cmdline to + be truncated. + config INITRAMFS_PRESERVE_MTIME bool "Preserve cpio archive mtimes in initramfs" + depends on BLK_DEV_INITRD default y help Each entry in an initramfs cpio archive carries an mtime value. When @@ -1382,6 +1548,13 @@ config INITRAMFS_PRESERVE_MTIME If unsure, say Y. +config INITRAMFS_TEST + bool "Test initramfs cpio archive extraction" if !KUNIT_ALL_TESTS + depends on BLK_DEV_INITRD && KUNIT=y + default KUNIT_ALL_TESTS + help + Build KUnit tests for initramfs. See Documentation/dev-tools/kunit + choice prompt "Compiler optimization level" default CC_OPTIMIZE_FOR_PERFORMANCE @@ -1467,6 +1640,16 @@ config SYSCTL_ARCH_UNALIGN_ALLOW the unaligned access emulation. see arch/parisc/kernel/unaligned.c for reference +config SYSFS_SYSCALL + bool "Sysfs syscall support" + default n + help + sys_sysfs is an obsolete system call no longer supported in libc. + Note that disabling this option is more secure but might break + compatibility with some systems. + + If unsure say N here. + config HAVE_PCSPKR_PLATFORM bool @@ -1511,16 +1694,6 @@ config SGETMASK_SYSCALL If unsure, leave the default option here. -config SYSFS_SYSCALL - bool "Sysfs syscall support" if EXPERT - default y - help - sys_sysfs is an obsolete system call no longer supported in libc. - Note that disabling this option is more secure but might break - compatibility with some systems. - - If unsure say Y here. - config FHANDLE bool "open by fhandle syscalls" if EXPERT select EXPORTFS @@ -1562,6 +1735,18 @@ config PRINTK very difficult to diagnose system problems, saying N here is strongly discouraged. +config PRINTK_RINGBUFFER_KUNIT_TEST + tristate "KUnit Test for the printk ringbuffer" if !KUNIT_ALL_TESTS + depends on PRINTK && KUNIT + default KUNIT_ALL_TESTS + help + This builds the printk ringbuffer KUnit test suite. + + For more information on KUnit and unit tests in general, please refer + to the KUnit documentation. + + If unsure, say N. + config BUG bool "BUG() support" if EXPERT default y @@ -1611,6 +1796,16 @@ config FUTEX_PI depends on FUTEX && RT_MUTEXES default y +config FUTEX_PRIVATE_HASH + bool + depends on FUTEX && !BASE_SMALL && MMU + default y + +config FUTEX_MPOL + bool + depends on FUTEX && NUMA + default y + config EPOLL bool "Enable eventpoll support" if EXPERT default y @@ -1673,6 +1868,30 @@ config IO_URING applications to submit and complete IO through submission and completion rings that are shared between the kernel and application. +config GCOV_PROFILE_URING + bool "Enable GCOV profiling on the io_uring subsystem" + depends on IO_URING && GCOV_KERNEL + help + Enable GCOV profiling on the io_uring subsystem, to facilitate + code coverage testing. + + If unsure, say N. + + Note that this will have a negative impact on the performance of + the io_uring subsystem, hence this should only be enabled for + specific test purposes. + +config IO_URING_MOCK_FILE + tristate "Enable io_uring mock files (Experimental)" if EXPERT + default n + depends on IO_URING + help + Enable mock files for io_uring subststem testing. The ABI might + still change, so it's still experimental and should only be enabled + for specific test purposes. + + If unsure, say N. + config ADVISE_SYSCALLS bool "Enable madvise/fadvise syscalls" if EXPERT default y @@ -1719,10 +1938,36 @@ config RSEQ If unsure, say Y. +config RSEQ_STATS + default n + bool "Enable lightweight statistics of restartable sequences" if EXPERT + depends on RSEQ && DEBUG_FS + help + Enable lightweight counters which expose information about the + frequency of RSEQ operations via debugfs. Mostly interesting for + kernel debugging or performance analysis. While lightweight it's + still adding code into the user/kernel mode transitions. + + If unsure, say N. + +config RSEQ_DEBUG_DEFAULT_ENABLE + default n + bool "Enable restartable sequences debug mode by default" if EXPERT + depends on RSEQ + help + This enables the static branch for debug mode of restartable + sequences. + + This also can be controlled on the kernel command line via the + command line parameter "rseq_debug=0/1" and through debugfs. + + If unsure, say N. + config DEBUG_RSEQ default n bool "Enable debugging of rseq() system call" if EXPERT - depends on RSEQ && DEBUG_KERNEL + depends on RSEQ && DEBUG_KERNEL && !GENERIC_ENTRY + select RSEQ_DEBUG_DEFAULT_ENABLE help Enable extra debugging checks for the rseq system call. @@ -1738,13 +1983,6 @@ config CACHESTAT_SYSCALL If unsure say Y here. -config PC104 - bool "PC/104 support" if EXPERT - help - Expose PC/104 form factor device drivers and options available for - selection and configuration. Enable this option if your target - machine has a PC/104 bus. - config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT default y @@ -1784,36 +2022,35 @@ config KALLSYMS_ALL Say N unless you really need all symbols, or kernel live patching. -config KALLSYMS_ABSOLUTE_PERCPU +# end of the "standard kernel features (expert users)" menu + +config ARCH_HAS_MEMBARRIER_CALLBACKS bool - depends on KALLSYMS - default X86_64 && SMP -config KALLSYMS_BASE_RELATIVE +config ARCH_HAS_MEMBARRIER_SYNC_CORE + bool + +config ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS bool - depends on KALLSYMS - default y help - Instead of emitting them as absolute values in the native word size, - emit the symbol references in the kallsyms table as 32-bit entries, - each containing a relative value in the range [base, base + U32_MAX] - or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either - an absolute value in the range [0, S32_MAX] or a relative value in the - range [base, base + S32_MAX], where base is the lowest relative symbol - address encountered in the image. + Control MSEAL_SYSTEM_MAPPINGS access based on architecture. - On 64-bit builds, this reduces the size of the address table by 50%, - but more importantly, it results in entries whose values are build - time constants, and no relocation pass is required at runtime to fix - up the entries based on the runtime load address of the kernel. + A 64-bit kernel is required for the memory sealing feature. + No specific hardware features from the CPU are needed. -# end of the "standard kernel features (expert users)" menu + To enable this feature, the architecture needs to update their + special mappings calls to include the sealing flag and confirm + that it doesn't unmap/remap system mappings during the life + time of the process. The existence of this flag for an architecture + implies that it does not require the remapping of the system + mappings during process lifetime, so sealing these mappings is safe + from a kernel perspective. -config ARCH_HAS_MEMBARRIER_CALLBACKS - bool + After the architecture enables this, a distribution can set + CONFIG_MSEAL_SYSTEM_MAPPING to manage access to the feature. -config ARCH_HAS_MEMBARRIER_SYNC_CORE - bool + For complete descriptions of memory sealing, please see + Documentation/userspace-api/mseal.rst config HAVE_PERF_EVENTS bool @@ -1902,11 +2139,16 @@ config RUST bool "Rust support" depends on HAVE_RUST depends on RUST_IS_AVAILABLE - depends on !CFI_CLANG - depends on !MODVERSIONS - depends on !GCC_PLUGINS + select EXTENDED_MODVERSIONS if MODVERSIONS + depends on !MODVERSIONS || GENDWARFKSYMS + depends on !GCC_PLUGIN_RANDSTRUCT depends on !RANDSTRUCT - depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE + depends on !DEBUG_INFO_BTF || (PAHOLE_HAS_LANG_EXCLUDE && !LTO) + depends on !CFI || HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC + select CFI_ICALL_NORMALIZE_INTEGERS if CFI + depends on !CALL_PADDING || RUSTC_VERSION >= 108100 + depends on !KASAN_SW_TAGS + depends on !(MITIGATION_RETHUNK && KASAN) || RUSTC_VERSION >= 108300 help Enables Rust support in the kernel. @@ -1923,12 +2165,19 @@ config RUST config RUSTC_VERSION_TEXT string depends on RUST - default $(shell,command -v $(RUSTC) >/dev/null 2>&1 && $(RUSTC) --version || echo n) + default "$(RUSTC_VERSION_TEXT)" + help + See `CC_VERSION_TEXT`. config BINDGEN_VERSION_TEXT string depends on RUST - default $(shell,command -v $(BINDGEN) >/dev/null 2>&1 && $(BINDGEN) --version || echo n) + # The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0 + # (https://github.com/rust-lang/rust-bindgen/pull/2678) and 0.71.0 + # (https://github.com/rust-lang/rust-bindgen/pull/3040). It can be removed + # when the minimum version is upgraded past the latter (0.69.1 and 0.71.1 + # both fixed the issue). + default "$(shell,$(BINDGEN) --version workaround-for-0.69.0 2>/dev/null)" # # Place an empty function call at each tracepoint site. Can be @@ -1936,9 +2185,12 @@ config BINDGEN_VERSION_TEXT # config TRACEPOINTS bool + select TASKS_TRACE_RCU source "kernel/Kconfig.kexec" +source "kernel/liveupdate/Kconfig" + endmenu # General setup source "arch/Kconfig" |