kernel: Remove CONFIG_COMPAT

This removes support for executing old 32 bit applications on 64 bit ARM
and MIPS kernels.
On OpenWrt we normally compile all the user space applications on our
own and do not support third party binary only modules especial not 32
bit applications on 64 bit CPUs.

This reduces the attack surface on such systems and should also save
some memory.

Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/armvirt/64/config-default

@@ -8,7 +8,6 @@ CONFIG_ARCH_HAS_KCOV=y
 CONFIG_ARCH_MMAP_RND_BITS=18
 CONFIG_ARCH_MMAP_RND_BITS_MAX=24
 CONFIG_ARCH_MMAP_RND_BITS_MIN=18
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=11
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
 CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
@@ -32,7 +31,6 @@ CONFIG_ARM64_ERRATUM_826319=y
 CONFIG_ARM64_ERRATUM_827319=y
 CONFIG_ARM64_ERRATUM_832075=y
 CONFIG_ARM64_ERRATUM_843419=y
-CONFIG_ARM64_ERRATUM_845719=y
 CONFIG_ARM64_HW_AFDBM=y
 # CONFIG_ARM64_LSE_ATOMICS is not set
 CONFIG_ARM64_MODULE_CMODEL_LARGE=y
@@ -48,7 +46,6 @@ CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
 # CONFIG_ARM64_VA_BITS_48 is not set
 CONFIG_ARM64_VHE=y
-# CONFIG_ARMV8_DEPRECATED is not set
 CONFIG_ARM_GIC_V3_ITS=y
 CONFIG_ARM_PMU=y
 # CONFIG_ARM_SBSA_WATCHDOG is not set
@@ -56,7 +53,6 @@ CONFIG_ATOMIC64_SELFTEST=y
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
 CONFIG_BACKLIGHT_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_LCD_SUPPORT=y
-CONFIG_BLOCK_COMPAT=y
 CONFIG_BOUNCE=y
 CONFIG_CLKSRC_MMIO=y
 CONFIG_CLKSRC_VERSATILE=y
@@ -64,10 +60,6 @@ CONFIG_CLK_SP810=y
 CONFIG_CLK_VEXPRESS_OSC=y
 CONFIG_COMMON_CLK_VERSATILE=y
 # CONFIG_COMMON_CLK_XGENE is not set
-CONFIG_COMPAT=y
-CONFIG_COMPAT_BINFMT_ELF=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
-CONFIG_COMPAT_OLD_SIGACTION=y
 # CONFIG_CPU_BIG_ENDIAN is not set
 CONFIG_CPU_IDLE=y
 # CONFIG_CPU_IDLE_GOV_LADDER is not set
@@ -114,7 +106,6 @@ CONFIG_HARDEN_BRANCH_PREDICTOR=y
 CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
 CONFIG_HAVE_ARCH_HUGE_VMAP=y
 CONFIG_HAVE_ARCH_KASAN=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
 CONFIG_HAVE_CMPXCHG_DOUBLE=y
 CONFIG_HAVE_CMPXCHG_LOCAL=y
@@ -176,7 +167,6 @@ CONFIG_SPARSEMEM_MANUAL=y
 CONFIG_SPARSEMEM_VMEMMAP=y
 CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 # CONFIG_THUNDER_NIC_BGX is not set
 # CONFIG_THUNDER_NIC_PF is not set

target/linux/brcm2708/bcm2710/config-4.14

@@ -118,7 +118,6 @@ CONFIG_CMA_SIZE_SEL_MBYTES=y
 # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
 CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_XGENE=y
-# CONFIG_COMPAT is not set
 CONFIG_CONFIGFS_FS=y
 CONFIG_CONSOLE_TRANSLATIONS=y
 # CONFIG_CPUFREQ_DT is not set

target/linux/generic/config-4.14

@@ -819,6 +819,7 @@ CONFIG_CMDLINE=""
 # CONFIG_COMMON_CLK_XLNX_CLKWZRD is not set
 CONFIG_COMPACTION=y
 # CONFIG_COMPAL_LAPTOP is not set
+# CONFIG_COMPAT is not set
 # CONFIG_COMPAT_BRK is not set
 # CONFIG_COMPILE_TEST is not set
 # CONFIG_CONFIGFS_FS is not set

target/linux/generic/config-4.19

@@ -850,6 +850,7 @@ CONFIG_CMDLINE=""
 # CONFIG_COMMON_CLK_XLNX_CLKWZRD is not set
 CONFIG_COMPACTION=y
 # CONFIG_COMPAL_LAPTOP is not set
+# CONFIG_COMPAT is not set
 # CONFIG_COMPAT_BRK is not set
 # CONFIG_COMPILE_TEST is not set
 # CONFIG_CONFIGFS_FS is not set

target/linux/generic/config-4.9

@@ -766,6 +766,7 @@ CONFIG_CMDLINE=""
 # CONFIG_COMMON_CLK_XLNX_CLKWZRD is not set
 CONFIG_COMPACTION=y
 # CONFIG_COMPAL_LAPTOP is not set
+# CONFIG_COMPAT is not set
 # CONFIG_COMPAT_BRK is not set
 # CONFIG_COMPILE_TEST is not set
 # CONFIG_CONFIGFS_FS is not set

target/linux/layerscape/armv8_64b/config-4.14

@@ -23,7 +23,6 @@ CONFIG_ARCH_LAYERSCAPE=y
 CONFIG_ARCH_MMAP_RND_BITS=18
 CONFIG_ARCH_MMAP_RND_BITS_MAX=33
 CONFIG_ARCH_MMAP_RND_BITS_MIN=18
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=11
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
@@ -54,7 +53,6 @@ CONFIG_ARM64_ERRATUM_826319=y
 CONFIG_ARM64_ERRATUM_827319=y
 CONFIG_ARM64_ERRATUM_832075=y
 CONFIG_ARM64_ERRATUM_843419=y
-CONFIG_ARM64_ERRATUM_845719=y
 CONFIG_ARM64_HW_AFDBM=y
 # CONFIG_ARM64_LSE_ATOMICS is not set
 CONFIG_ARM64_MODULE_CMODEL_LARGE=y
@@ -70,7 +68,6 @@ CONFIG_ARM64_VA_BITS=48
 # CONFIG_ARM64_VA_BITS_39 is not set
 CONFIG_ARM64_VA_BITS_48=y
 CONFIG_ARM64_VHE=y
-# CONFIG_ARMV8_DEPRECATED is not set
 CONFIG_ARM_AMBA=y
 CONFIG_ARM_ARCH_TIMER=y
 CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
@@ -95,7 +92,6 @@ CONFIG_ATA=y
 CONFIG_AUDIT=y
 CONFIG_AUDITSYSCALL=y
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
-CONFIG_AUDIT_COMPAT_GENERIC=y
 CONFIG_AUDIT_GENERIC=y
 CONFIG_AUDIT_TREE=y
 CONFIG_AUDIT_WATCH=y
@@ -117,7 +113,6 @@ CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_MQ_VIRTIO=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 # CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
 CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
 CONFIG_BOUNCE=y
@@ -155,10 +150,6 @@ CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_CS2000_CP=y
 CONFIG_COMMON_CLK_VERSATILE=y
 CONFIG_COMMON_CLK_XGENE=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_BINFMT_ELF=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
-CONFIG_COMPAT_OLD_SIGACTION=y
 CONFIG_CONFIGFS_FS=y
 CONFIG_CONSOLE_TRANSLATIONS=y
 CONFIG_COREDUMP=y
@@ -432,7 +423,6 @@ CONFIG_HAVE_ARCH_HUGE_VMAP=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KASAN=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_PFN_VALID=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
@@ -473,7 +463,6 @@ CONFIG_HAVE_RCU_TABLE_FREE=y
 CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
 CONFIG_HAVE_SETUP_PER_CPU_AREA=y
 CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
-CONFIG_HAVE_UID16=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_HIBERNATE_CALLBACKS=y
 CONFIG_HIBERNATION=y
@@ -687,7 +676,6 @@ CONFIG_OF_NUMA=y
 CONFIG_OF_PCI=y
 CONFIG_OF_PCI_IRQ=y
 CONFIG_OF_RESERVED_MEM=y
-CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_PACKET_DIAG=y
 CONFIG_PADATA=y
 # CONFIG_PANIC_ON_OOPS is not set
@@ -863,7 +851,6 @@ CONFIG_SYNC_FILE=y
 # CONFIG_SYN_COOKIES is not set
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
 CONFIG_SYSFS_SYSCALL=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_HYPERVISOR=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_TASKSTATS=y

target/linux/malta/be64/config-default

@@ -4,14 +4,10 @@ CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_ARCH_MMAP_RND_BITS=12
 CONFIG_ARCH_MMAP_RND_BITS_MAX=18
 CONFIG_ARCH_MMAP_RND_BITS_MIN=12
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
 CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
 CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
 CONFIG_BINFMT_ELF32=y
-CONFIG_BLOCK_COMPAT=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
 CONFIG_CPU_BIG_ENDIAN=y
 # CONFIG_CPU_LITTLE_ENDIAN is not set
 CONFIG_CPU_MIPS64=y
@@ -20,7 +16,6 @@ CONFIG_CPU_MIPSR1=y
 CONFIG_CPU_SUPPORTS_64BIT_KERNEL=y
 CONFIG_CPU_SUPPORTS_HUGEPAGES=y
 CONFIG_HAVE_64BIT_ALIGNED_ACCESS=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
 CONFIG_HAVE_EBPF_JIT=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
@@ -33,6 +28,5 @@ CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_PCI_BUS_ADDR_T_64BIT=y
 CONFIG_PGTABLE_LEVELS=3
 CONFIG_PHYS_ADDR_T_64BIT=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_ZONE_DMA32=y

target/linux/malta/le64/config-default

@@ -4,14 +4,10 @@ CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_ARCH_MMAP_RND_BITS=12
 CONFIG_ARCH_MMAP_RND_BITS_MAX=18
 CONFIG_ARCH_MMAP_RND_BITS_MIN=12
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
 CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
 CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
 CONFIG_BINFMT_ELF32=y
-CONFIG_BLOCK_COMPAT=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
 # CONFIG_CPU_BIG_ENDIAN is not set
 CONFIG_CPU_LITTLE_ENDIAN=y
 CONFIG_CPU_MIPS64=y
@@ -20,7 +16,6 @@ CONFIG_CPU_MIPSR1=y
 CONFIG_CPU_SUPPORTS_64BIT_KERNEL=y
 CONFIG_CPU_SUPPORTS_HUGEPAGES=y
 CONFIG_HAVE_64BIT_ALIGNED_ACCESS=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
 CONFIG_HAVE_EBPF_JIT=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
@@ -33,6 +28,5 @@ CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_PCI_BUS_ADDR_T_64BIT=y
 CONFIG_PGTABLE_LEVELS=3
 CONFIG_PHYS_ADDR_T_64BIT=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_ZONE_DMA32=y

target/linux/mediatek/mt7622/config-4.14

@@ -19,7 +19,6 @@ CONFIG_ARCH_MEDIATEK=y
 CONFIG_ARCH_MMAP_RND_BITS=18
 CONFIG_ARCH_MMAP_RND_BITS_MAX=24
 CONFIG_ARCH_MMAP_RND_BITS_MIN=18
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=11
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
@@ -58,7 +57,6 @@ CONFIG_ARM64_VA_BITS=39
 CONFIG_ARM64_VA_BITS_39=y
 # CONFIG_ARM64_VA_BITS_48 is not set
 CONFIG_ARM64_VHE=y
-# CONFIG_ARMV8_DEPRECATED is not set
 CONFIG_ARM_AMBA=y
 CONFIG_ARM_ARCH_TIMER=y
 CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
@@ -75,7 +73,6 @@ CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 # CONFIG_BOUNCE is not set
 CONFIG_BSD_PROCESS_ACCT=y
 CONFIG_BSD_PROCESS_ACCT_V3=y
@@ -108,10 +105,6 @@ CONFIG_COMMON_CLK_MT7622_AUDSYS=y
 CONFIG_COMMON_CLK_MT7622_ETHSYS=y
 CONFIG_COMMON_CLK_MT7622_HIFSYS=y
 # CONFIG_COMMON_CLK_MT8173 is not set
-CONFIG_COMPAT=y
-CONFIG_COMPAT_BINFMT_ELF=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
-CONFIG_COMPAT_OLD_SIGACTION=y
 CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
 # CONFIG_CPUFREQ_DT is not set
 # CONFIG_CPU_BIG_ENDIAN is not set
@@ -213,7 +206,6 @@ CONFIG_HAVE_ARCH_HUGE_VMAP=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KASAN=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_PFN_VALID=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
@@ -252,7 +244,6 @@ CONFIG_HAVE_PERF_USER_STACK_DUMP=y
 CONFIG_HAVE_RCU_TABLE_FREE=y
 CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
 CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
-CONFIG_HAVE_UID16=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 # CONFIG_HUGETLBFS is not set
 # CONFIG_HW_RANDOM_MTK is not set
@@ -331,7 +322,6 @@ CONFIG_OF_NET=y
 CONFIG_OF_PCI=y
 CONFIG_OF_PCI_IRQ=y
 CONFIG_OF_RESERVED_MEM=y
-CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_PADATA=y
 CONFIG_PARTITION_PERCPU=y
 CONFIG_PCI=y
@@ -419,7 +409,6 @@ CONFIG_SWAP=y
 CONFIG_SWIOTLB=y
 CONFIG_SWPHY=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_THERMAL=y
 CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y

target/linux/mvebu/cortexa53/config-default

@@ -56,7 +56,6 @@ CONFIG_ARM_GIC_V3_ITS=y
 CONFIG_ARM_PSCI_FW=y
 # CONFIG_ARM_SP805_WATCHDOG is not set
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
-# CONFIG_COMPAT is not set
 # CONFIG_DEBUG_ALIGN_RODATA is not set
 CONFIG_FRAME_POINTER=y
 CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y

target/linux/mvebu/cortexa72/config-default

@@ -55,7 +55,6 @@ CONFIG_ARM_GIC_V3_ITS=y
 CONFIG_ARM_PSCI_FW=y
 # CONFIG_ARM_SP805_WATCHDOG is not set
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
-# CONFIG_COMPAT is not set
 # CONFIG_DEBUG_ALIGN_RODATA is not set
 CONFIG_FRAME_POINTER=y
 CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y

target/linux/octeon/config-4.14

@@ -14,7 +14,6 @@ CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
 CONFIG_ARCH_MMAP_RND_BITS=12
 CONFIG_ARCH_MMAP_RND_BITS_MAX=18
 CONFIG_ARCH_MMAP_RND_BITS_MIN=12
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=15
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
@@ -34,7 +33,6 @@ CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 # CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
 CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
 CONFIG_BUILTIN_DTB=y
@@ -49,8 +47,6 @@ CONFIG_CAVIUM_OCTEON_LOCK_L2_TLB=y
 CONFIG_CAVIUM_OCTEON_SOC=y
 CONFIG_CEVT_R4K=y
 CONFIG_CLONE_BACKWARDS=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
 CONFIG_CPU_BIG_ENDIAN=y
 CONFIG_CPU_CAVIUM_OCTEON=y
 CONFIG_CPU_GENERIC_DUMP_TLB=y
@@ -125,7 +121,6 @@ CONFIG_HAVE_64BIT_ALIGNED_ACCESS=y
 # CONFIG_HAVE_ARCH_BITREVERSE is not set
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
 CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
@@ -276,7 +271,6 @@ CONFIG_SWPHY=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
 CONFIG_SYSFS_DEPRECATED=y
 CONFIG_SYSFS_DEPRECATED_V2=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_HAS_CPU_CAVIUM_OCTEON=y
 CONFIG_SYS_HAS_EARLY_PRINTK=y
 CONFIG_SYS_SUPPORTS_64BIT_KERNEL=y

target/linux/octeon/config-4.19

@@ -8,7 +8,6 @@ CONFIG_ARCH_HAS_PHYS_TO_DMA=y
 CONFIG_ARCH_MMAP_RND_BITS=12
 CONFIG_ARCH_MMAP_RND_BITS_MAX=18
 CONFIG_ARCH_MMAP_RND_BITS_MIN=12
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=15
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
 CONFIG_ARCH_SUPPORTS_UPROBES=y
@@ -24,7 +23,6 @@ CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 CONFIG_BUILTIN_DTB=y
 # CONFIG_CAVIUM_CN63XXP1 is not set
 CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE=2
@@ -37,9 +35,6 @@ CONFIG_CAVIUM_OCTEON_LOCK_L2_TLB=y
 CONFIG_CAVIUM_OCTEON_SOC=y
 CONFIG_CEVT_R4K=y
 CONFIG_CLONE_BACKWARDS=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_32BIT_TIME=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
 CONFIG_CPU_BIG_ENDIAN=y
 CONFIG_CPU_CAVIUM_OCTEON=y
 CONFIG_CPU_GENERIC_DUMP_TLB=y
@@ -114,7 +109,6 @@ CONFIG_HAVE_64BIT_ALIGNED_ACCESS=y
 CONFIG_HAVE_ARCH_COMPILER_H=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
 CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
@@ -245,7 +239,6 @@ CONFIG_SRCU=y
 CONFIG_SWIOTLB=y
 CONFIG_SWPHY=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_HAS_CPU_CAVIUM_OCTEON=y
 CONFIG_SYS_HAS_EARLY_PRINTK=y
 CONFIG_SYS_SUPPORTS_64BIT_KERNEL=y

target/linux/octeontx/config-4.14

@@ -20,7 +20,6 @@ CONFIG_ARCH_HIBERNATION_POSSIBLE=y
 CONFIG_ARCH_MMAP_RND_BITS=18
 CONFIG_ARCH_MMAP_RND_BITS_MAX=33
 CONFIG_ARCH_MMAP_RND_BITS_MIN=18
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=11
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
@@ -60,7 +59,6 @@ CONFIG_ARM64_VA_BITS=48
 # CONFIG_ARM64_VA_BITS_39 is not set
 CONFIG_ARM64_VA_BITS_48=y
 CONFIG_ARM64_VHE=y
-# CONFIG_ARMV8_DEPRECATED is not set
 CONFIG_ARM_AMBA=y
 CONFIG_ARM_ARCH_TIMER=y
 CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
@@ -88,7 +86,6 @@ CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_MQ_VIRTIO=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 CONFIG_BOUNCE=y
 CONFIG_BPF_JIT=y
 CONFIG_CAN=y
@@ -119,10 +116,6 @@ CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_CS2000_CP=y
 # CONFIG_COMMON_CLK_VERSATILE is not set
 CONFIG_COMMON_CLK_XGENE=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_BINFMT_ELF=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
-CONFIG_COMPAT_OLD_SIGACTION=y
 CONFIG_CONFIGFS_FS=y
 CONFIG_CPUSETS=y
 # CONFIG_CPU_BIG_ENDIAN is not set
@@ -259,7 +252,6 @@ CONFIG_HAVE_ARCH_HUGE_VMAP=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KASAN=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_PFN_VALID=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
@@ -299,7 +291,6 @@ CONFIG_HAVE_RCU_TABLE_FREE=y
 CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
 CONFIG_HAVE_SETUP_PER_CPU_AREA=y
 CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
-CONFIG_HAVE_UID16=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_HIBERNATE_CALLBACKS=y
 CONFIG_HIBERNATION=y
@@ -392,7 +383,6 @@ CONFIG_OF_NUMA=y
 CONFIG_OF_PCI=y
 CONFIG_OF_PCI_IRQ=y
 CONFIG_OF_RESERVED_MEM=y
-CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_OPTEE=y
 CONFIG_PADATA=y
 CONFIG_PAGE_COUNTER=y
@@ -498,7 +488,6 @@ CONFIG_SWPHY=y
 CONFIG_SYNC_FILE=y
 CONFIG_SYSCON_REBOOT_MODE=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y

target/linux/sunxi/cortexa53/config-4.14

@@ -44,7 +44,6 @@ CONFIG_ARM_AMBA=y
 CONFIG_ARM_GIC_V3=y
 # CONFIG_ARM_SP805_WATCHDOG is not set
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
-# CONFIG_COMPAT is not set
 CONFIG_DWMAC_SUN8I=y
 CONFIG_FRAME_POINTER=y
 CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y

target/linux/sunxi/cortexa53/config-4.19

@@ -45,7 +45,6 @@ CONFIG_ARM64_VA_BITS_39=y
 CONFIG_ARM_AMBA=y
 # CONFIG_ARM_SP805_WATCHDOG is not set
 CONFIG_AUDIT_ARCH_COMPAT_GENERIC=y
-# CONFIG_COMPAT is not set
 CONFIG_DMA_DIRECT_OPS=y
 CONFIG_DWMAC_SUN8I=y
 # CONFIG_FLATMEM_MANUAL is not set