/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_BITS_PER_LONG
#define __ASM_GENERIC_BITS_PER_LONG

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG
#define _UAPI__ASM_GENERIC_BITS_PER_LONG

#ifndef __BITS_PER_LONG
/*
 * In order to keep safe and avoid regression, only unify uapi
 * bitsperlong.h for some archs which are using newer toolchains
 * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
 * See the following link for more info:
 * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
 */
#if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
#else
/*
 * There seems to be no way of detecting this automatically from user
 * space, so 64 bit architectures should override this in their
 * bitsperlong.h. In particular, an architecture that supports
 * both 32 and 64 bit user space must not rely on CONFIG_64BIT
 * to decide it, but rather check a compiler provided macro.
 */
#define __BITS_PER_LONG 32
#endif
#endif

#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */



#ifdef CONFIG_64BIT
#ifndef BITS_PER_LONG
#define BITS_PER_LONG 64
#endif
#else
#define BITS_PER_LONG 32
#endif /* CONFIG_64BIT */

/*
 * FIXME: The check currently breaks x86-64 build, so it's
 * temporarily disabled. Please fix x86-64 and reenable
 */
#if 0 && BITS_PER_LONG != __BITS_PER_LONG
#error Inconsistent word size. Check asm/bitsperlong.h
#endif

#ifndef BITS_PER_LONG_LONG
#define BITS_PER_LONG_LONG 64
#endif

/*
 * small_const_nbits(n) is true precisely when it is known at compile-time
 * that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows
 * various bit/bitmap APIs to provide a fast inline implementation. Bitmaps
 * of size 0 are very rare, and a compile-time-known-size 0 is most likely
 * a sign of error. They will be handled correctly by the bit/bitmap APIs,
 * but using the out-of-line functions, so that the inline implementations
 * can unconditionally dereference the pointer(s).
 */
#define small_const_nbits(nbits) \
	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0)

#endif /* __ASM_GENERIC_BITS_PER_LONG */