CONFIG_PPC is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC (not configurable)

configname: CONFIG_PPC

Linux Kernel Configuration
└─>PPC
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
selects
CONFIG_ARCH_32BIT_OFF_T
CONFIG_ARCH_HAS_DEBUG_VIRTUAL
CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED
CONFIG_ARCH_HAS_ELF_RANDOMIZE
CONFIG_ARCH_HAS_FORTIFY_SOURCE
CONFIG_ARCH_HAS_GCOV_PROFILE_ALL
CONFIG_ARCH_HAS_KCOV
CONFIG_ARCH_HAS_HUGEPD
CONFIG_ARCH_HAS_MMIOWB
CONFIG_ARCH_HAS_PHYS_TO_DMA
CONFIG_ARCH_HAS_PMEM_API
CONFIG_ARCH_HAS_PTE_DEVMAP
CONFIG_ARCH_HAS_PTE_SPECIAL
CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKS
CONFIG_ARCH_HAS_SCALED_CPUTIME
CONFIG_ARCH_HAS_STRICT_KERNEL_RWX
CONFIG_ARCH_HAS_TICK_BROADCAST
CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
CONFIG_ARCH_HAS_UACCESS_MCSAFE
CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
CONFIG_ARCH_KEEP_MEMBLOCK
CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT
CONFIG_ARCH_MIGHT_HAVE_PC_SERIO
CONFIG_ARCH_OPTIONAL_KERNEL_RWX
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW
CONFIG_ARCH_USE_BUILTIN_BSWAP
CONFIG_ARCH_USE_CMPXCHG_LOCKREF
CONFIG_ARCH_WANT_IPC_PARSE_VERSION
CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM
CONFIG_ARCH_WEAK_RELEASE_ACQUIRE
CONFIG_BINFMT_ELF
CONFIG_BUILDTIME_EXTABLE_SORT
CONFIG_CLONE_BACKWARDS
CONFIG_DCACHE_WORD_ACCESS
CONFIG_DYNAMIC_FTRACE
CONFIG_EDAC_ATOMIC_SCRUB
CONFIG_EDAC_SUPPORT
CONFIG_GENERIC_ATOMIC64
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
CONFIG_GENERIC_CMOS_UPDATE
CONFIG_GENERIC_CPU_AUTOPROBE
CONFIG_GENERIC_CPU_VULNERABILITIES
CONFIG_GENERIC_IRQ_SHOW
CONFIG_GENERIC_IRQ_SHOW_LEVEL
CONFIG_GENERIC_PCI_IOMAP
CONFIG_GENERIC_SMP_IDLE_THREAD
CONFIG_GENERIC_STRNCPY_FROM_USER
CONFIG_GENERIC_STRNLEN_USER
CONFIG_GENERIC_TIME_VSYSCALL
CONFIG_HAVE_ARCH_AUDITSYSCALL
CONFIG_HAVE_ARCH_HUGE_VMAP
CONFIG_HAVE_ARCH_JUMP_LABEL
CONFIG_HAVE_ARCH_KASAN
CONFIG_HAVE_ARCH_KGDB
CONFIG_HAVE_ARCH_MMAP_RND_BITS
CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
CONFIG_HAVE_ARCH_NVRAM_OPS
CONFIG_HAVE_ARCH_SECCOMP_FILTER
CONFIG_HAVE_ARCH_TRACEHOOK
CONFIG_HAVE_ASM_MODVERSIONS
CONFIG_HAVE_C_RECORDMCOUNT
CONFIG_HAVE_CBPF_JIT
CONFIG_HAVE_STACKPROTECTOR
CONFIG_HAVE_STACKPROTECTOR
CONFIG_HAVE_CONTEXT_TRACKING
CONFIG_HAVE_COPY_THREAD_TLS
CONFIG_HAVE_DEBUG_KMEMLEAK
CONFIG_HAVE_DEBUG_STACKOVERFLOW
CONFIG_HAVE_DYNAMIC_FTRACE
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS
CONFIG_HAVE_EBPF_JIT
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
CONFIG_HAVE_FAST_GUP
CONFIG_HAVE_FTRACE_MCOUNT_RECORD
CONFIG_HAVE_FUNCTION_ERROR_INJECTION
CONFIG_HAVE_FUNCTION_GRAPH_TRACER
CONFIG_HAVE_FUNCTION_TRACER
CONFIG_HAVE_GCC_PLUGINS
CONFIG_HAVE_HW_BREAKPOINT
CONFIG_HAVE_IDE
CONFIG_HAVE_IOREMAP_PROT
CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
CONFIG_HAVE_KERNEL_GZIP
CONFIG_HAVE_KERNEL_LZMA
CONFIG_HAVE_KERNEL_LZO
CONFIG_HAVE_KERNEL_XZ
CONFIG_HAVE_KPROBES
CONFIG_HAVE_KPROBES_ON_FTRACE
CONFIG_HAVE_KRETPROBES
CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION
CONFIG_HAVE_LIVEPATCH
CONFIG_HAVE_MEMBLOCK_NODE_MAP
CONFIG_HAVE_MOD_ARCH_SPECIFIC
CONFIG_HAVE_NMI
CONFIG_HAVE_HARDLOCKUP_DETECTOR_ARCH
CONFIG_HAVE_OPROFILE
CONFIG_HAVE_OPTPROBES
CONFIG_HAVE_PERF_EVENTS
CONFIG_HAVE_PERF_EVENTS_NMI
CONFIG_HAVE_HARDLOCKUP_DETECTOR_PERF
CONFIG_HAVE_PERF_REGS
CONFIG_HAVE_PERF_USER_STACK_DUMP
CONFIG_HAVE_RCU_TABLE_FREE
CONFIG_HAVE_MMU_GATHER_PAGE_SIZE
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API
CONFIG_HAVE_RELIABLE_STACKTRACE
CONFIG_HAVE_SYSCALL_TRACEPOINTS
CONFIG_HAVE_VIRT_CPU_ACCOUNTING
CONFIG_HAVE_IRQ_TIME_ACCOUNTING
CONFIG_HAVE_RSEQ
CONFIG_IOMMU_HELPER
CONFIG_IRQ_DOMAIN
CONFIG_IRQ_FORCED_THREADING
CONFIG_MODULES_USE_ELF_RELA
CONFIG_NEED_DMA_MAP_STATE
CONFIG_NEED_SG_DMA_LENGTH
CONFIG_OF
CONFIG_OF_DMA_DEFAULT_COHERENT
CONFIG_OF_EARLY_FLATTREE
CONFIG_OLD_SIGACTION
CONFIG_OLD_SIGSUSPEND
CONFIG_PCI_DOMAINS
CONFIG_PCI_SYSCALL
CONFIG_PPC_DAWR
CONFIG_RTC_LIB
CONFIG_SPARSE_IRQ
CONFIG_SYSCTL_EXCEPTION_TRACE
CONFIG_THREAD_INFO_IN_TASK
CONFIG_VIRT_TO_BUS