[linux-2.6-block.git] / include / asm-generic / bitsperlong.h

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

#include <uapi/asm-generic/bitsperlong.h>


#ifdef CONFIG_64BIT
#define BITS_PER_LONG 64
#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 */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef __ASM_GENERIC_BITS_PER_LONG
	3	#define __ASM_GENERIC_BITS_PER_LONG
	4
	5	#include <uapi/asm-generic/bitsperlong.h>
	6
	7
	8	#ifdef CONFIG_64BIT
	9	#define BITS_PER_LONG 64
	10	#else
	11	#define BITS_PER_LONG 32
	12	#endif /* CONFIG_64BIT */
	13
	14	/*
	15	* FIXME: The check currently breaks x86-64 build, so it's
	16	* temporarily disabled. Please fix x86-64 and reenable
	17	*/
	18	#if 0 && BITS_PER_LONG != __BITS_PER_LONG
	19	#error Inconsistent word size. Check asm/bitsperlong.h
	20	#endif
	21
	22	#ifndef BITS_PER_LONG_LONG
	23	#define BITS_PER_LONG_LONG 64
	24	#endif
	25
	26	/*
	27	* small_const_nbits(n) is true precisely when it is known at compile-time
	28	* that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows
	29	* various bit/bitmap APIs to provide a fast inline implementation. Bitmaps
	30	* of size 0 are very rare, and a compile-time-known-size 0 is most likely
	31	* a sign of error. They will be handled correctly by the bit/bitmap APIs,
	32	* but using the out-of-line functions, so that the inline implementations
	33	* can unconditionally dereference the pointer(s).
	34	*/
	35	#define small_const_nbits(nbits) \
	36	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0)
	37
	38	#endif /* __ASM_GENERIC_BITS_PER_LONG */