diff options
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 127 |
1 files changed, 74 insertions, 53 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index a7b57dd42c26..98de654b79b3 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -18,6 +18,9 @@ config KEXEC_CORE select CRASH_CORE bool +config KEXEC_ELF + bool + config HAVE_IMA_KEXEC bool @@ -69,11 +72,11 @@ config KPROBES If in doubt, say "N". config JUMP_LABEL - bool "Optimize very unlikely/likely branches" - depends on HAVE_ARCH_JUMP_LABEL - depends on CC_HAS_ASM_GOTO - help - This option enables a transparent branch optimization that + bool "Optimize very unlikely/likely branches" + depends on HAVE_ARCH_JUMP_LABEL + depends on CC_HAS_ASM_GOTO + help + This option enables a transparent branch optimization that makes certain almost-always-true or almost-always-false branch conditions even cheaper to execute within the kernel. @@ -81,7 +84,7 @@ config JUMP_LABEL scheduler functionality, networking code and KVM have such branches and include support for this optimization technique. - If it is detected that the compiler has support for "asm goto", + If it is detected that the compiler has support for "asm goto", the kernel will compile such branches with just a nop instruction. When the condition flag is toggled to true, the nop will be converted to a jump instruction to execute the @@ -103,7 +106,7 @@ config STATIC_KEYS_SELFTEST config OPTPROBES def_bool y depends on KPROBES && HAVE_OPTPROBES - select TASKS_RCU if PREEMPT + select TASKS_RCU if PREEMPTION config KPROBES_ON_FTRACE def_bool y @@ -148,8 +151,8 @@ config HAVE_EFFICIENT_UNALIGNED_ACCESS information on the topic of unaligned memory accesses. config ARCH_USE_BUILTIN_BSWAP - bool - help + bool + help Modern versions of GCC (since 4.4) have builtin functions for handling byte-swapping. Using these, instead of the old inline assembler that the architecture code provides in the @@ -218,10 +221,10 @@ config HAVE_DMA_CONTIGUOUS bool config GENERIC_SMP_IDLE_THREAD - bool + bool config GENERIC_IDLE_POLL_SETUP - bool + bool config ARCH_HAS_FORTIFY_SOURCE bool @@ -254,7 +257,7 @@ config ARCH_HAS_UNCACHED_SEGMENT # Select if arch init_task must go in the __init_task_data section config ARCH_TASK_STRUCT_ON_STACK - bool + bool # Select if arch has its private alloc_task_struct() function config ARCH_TASK_STRUCT_ALLOCATOR @@ -289,6 +292,13 @@ config ARCH_32BIT_OFF_T still support 32-bit off_t. This option is enabled for all such architectures explicitly. +config HAVE_ASM_MODVERSIONS + bool + help + This symbol should be selected by an architecure if it provides + <asm/asm-prototypes.h> to support the module versioning for symbols + exported from assembly code. + config HAVE_REGS_AND_STACK_ACCESS_API bool help @@ -383,17 +393,22 @@ config HAVE_ARCH_JUMP_LABEL config HAVE_ARCH_JUMP_LABEL_RELATIVE bool -config HAVE_RCU_TABLE_FREE +config MMU_GATHER_TABLE_FREE + bool + +config MMU_GATHER_RCU_TABLE_FREE bool + select MMU_GATHER_TABLE_FREE -config HAVE_RCU_TABLE_NO_INVALIDATE +config MMU_GATHER_PAGE_SIZE bool -config HAVE_MMU_GATHER_PAGE_SIZE +config MMU_GATHER_NO_RANGE bool -config HAVE_MMU_GATHER_NO_GATHER +config MMU_GATHER_NO_GATHER bool + depends on MMU_GATHER_TABLE_FREE config ARCH_HAVE_NMI_SAFE_CMPXCHG bool @@ -696,6 +711,17 @@ config HAVE_ARCH_COMPAT_MMAP_BASES and vice-versa 32-bit applications to call 64-bit mmap(). Required for applications doing different bitness syscalls. +# This allows to use a set of generic functions to determine mmap base +# address by giving priority to top-down scheme only if the process +# is not in legacy mode (compat task, unlimited stack size or +# sysctl_legacy_va_layout). +# Architecture that selects this option can provide its own version of: +# - STACK_RND_MASK +config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT + bool + depends on MMU + select ARCH_HAS_ELF_RANDOMIZE + config HAVE_COPY_THREAD_TLS bool help @@ -775,24 +801,14 @@ config OLD_SIGACTION config COMPAT_OLD_SIGACTION bool -config 64BIT_TIME - def_bool y - help - This should be selected by all architectures that need to support - new system calls with a 64-bit time_t. This is relevant on all 32-bit - architectures, and 64-bit architectures as part of compat syscall - handling. - config COMPAT_32BIT_TIME - def_bool !64BIT || COMPAT + bool "Provide system calls for 32-bit time_t" + default !64BIT || COMPAT help This enables 32 bit time_t support in addition to 64 bit time_t support. This is relevant on all 32-bit architectures, and 64-bit architectures as part of compat syscall handling. -config ARCH_NO_COHERENT_DMA_MMAP - bool - config ARCH_NO_PREEMPT bool @@ -825,16 +841,17 @@ config HAVE_ARCH_VMAP_STACK config VMAP_STACK default y bool "Use a virtually-mapped stack" - depends on HAVE_ARCH_VMAP_STACK && !KASAN + depends on HAVE_ARCH_VMAP_STACK + depends on !KASAN || KASAN_VMALLOC ---help--- Enable this if you want the use virtually-mapped kernel stacks with guard pages. This causes kernel stack overflows to be caught immediately rather than causing difficult-to-diagnose corruption. - This is presently incompatible with KASAN because KASAN expects - the stack to map directly to the KASAN shadow map using a formula - that is incorrect if the stack is in vmalloc space. + To use this with KASAN, the architecture must support backing + virtual mappings with real shadow memory, and KASAN_VMALLOC must + be enabled. config ARCH_OPTIONAL_KERNEL_RWX def_bool n @@ -874,27 +891,6 @@ config STRICT_MODULE_RWX config ARCH_HAS_PHYS_TO_DMA bool -config ARCH_HAS_REFCOUNT - bool - help - An architecture selects this when it has implemented refcount_t - using open coded assembly primitives that provide an optimized - refcount_t implementation, possibly at the expense of some full - refcount state checks of CONFIG_REFCOUNT_FULL=y. - - The refcount overflow check behavior, however, must be retained. - Catching overflows is the primary security concern for protecting - against bugs in reference counts. - -config REFCOUNT_FULL - bool "Perform full reference count validation at the expense of speed" - help - Enabling this switches the refcounting infrastructure from a fast - unchecked atomic_t implementation to a fully state checked - implementation, which can be (slightly) slower but provides protections - against various use-after-free conditions that can be used in - security flaw exploits. - config HAVE_ARCH_COMPILER_H bool help @@ -925,6 +921,31 @@ config LOCK_EVENT_COUNTS the chance of application behavior change because of timing differences. The counts are reported via debugfs. +# Select if the architecture has support for applying RELR relocations. +config ARCH_HAS_RELR + bool + +config RELR + bool "Use RELR relocation packing" + depends on ARCH_HAS_RELR && TOOLS_SUPPORT_RELR + default y + help + Store the kernel's dynamic relocations in the RELR relocation packing + format. Requires a compatible linker (LLD supports this feature), as + well as compatible NM and OBJCOPY utilities (llvm-nm and llvm-objcopy + are compatible). + +config ARCH_HAS_MEM_ENCRYPT + bool + +config HAVE_SPARSE_SYSCALL_NR + bool + help + An architecture should select this if its syscall numbering is sparse + to save space. For example, MIPS architecture has a syscall array with + entries at 4000, 5000 and 6000 locations. This option turns on syscall + related optimizations for a given architecture. + source "kernel/gcov/Kconfig" source "scripts/gcc-plugins/Kconfig" |
