locking/refcount: Consolidate implementations of refcount_t

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

	select OLD_SIGSUSPEND3

	select PCI_SYSCALL if PCI

	select PERF_USE_VMALLOC

	select REFCOUNT_FULL

	select RTC_LIB

	select SYS_SUPPORTS_APM_EMULATION

	# Above selects are sorted alphabetically; please add new ones

	select PCI_SYSCALL if PCI

	select POWER_RESET

	select POWER_SUPPLY

	select REFCOUNT_FULL

	select SPARSE_IRQ

	select SWIOTLB

	select SYSCTL_EXCEPTION_TRACE

CONFIG_KPROBES=y

CONFIG_JUMP_LABEL=y

CONFIG_STATIC_KEYS_SELFTEST=y

CONFIG_REFCOUNT_FULL=y

CONFIG_LOCK_EVENT_COUNTS=y

CONFIG_MODULES=y

CONFIG_MODULE_FORCE_LOAD=y

	select ARCH_HAS_PMEM_API		if X86_64

	select ARCH_HAS_PTE_DEVMAP		if X86_64

	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_REFCOUNT

	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64

	select ARCH_HAS_UACCESS_MCSAFE		if X86_64 && X86_MCE

	select ARCH_HAS_SET_MEMORY