1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_GENERIC_BITS_PER_LONG 3 #define __ASM_GENERIC_BITS_PER_LONG 4 5 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 6 #ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG 7 #define _UAPI__ASM_GENERIC_BITS_PER_LONG 8 9 #ifndef __BITS_PER_LONG 10 /* 11 * In order to keep safe and avoid regression, only unify uapi 12 * bitsperlong.h for some archs which are using newer toolchains 13 * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__. 14 * See the following link for more info: 15 * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/ 16 */ 17 #if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__) 18 #define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__) 19 #else 20 /* 21 * There seems to be no way of detecting this automatically from user 22 * space, so 64 bit architectures should override this in their 23 * bitsperlong.h. In particular, an architecture that supports 24 * both 32 and 64 bit user space must not rely on CONFIG_64BIT 25 * to decide it, but rather check a compiler provided macro. 26 */ 27 #define __BITS_PER_LONG 32 28 #endif 29 #endif 30 31 #endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */ 32 33 34 35 #ifdef CONFIG_64BIT 36 #ifndef BITS_PER_LONG 37 #define BITS_PER_LONG 64 38 #endif 39 #else 40 #define BITS_PER_LONG 32 41 #endif /* CONFIG_64BIT */ 42 43 /* 44 * FIXME: The check currently breaks x86-64 build, so it's 45 * temporarily disabled. Please fix x86-64 and reenable 46 */ 47 #if 0 && BITS_PER_LONG != __BITS_PER_LONG 48 #error Inconsistent word size. Check asm/bitsperlong.h 49 #endif 50 51 #ifndef BITS_PER_LONG_LONG 52 #define BITS_PER_LONG_LONG 64 53 #endif 54 55 /* 56 * small_const_nbits(n) is true precisely when it is known at compile-time 57 * that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows 58 * various bit/bitmap APIs to provide a fast inline implementation. Bitmaps 59 * of size 0 are very rare, and a compile-time-known-size 0 is most likely 60 * a sign of error. They will be handled correctly by the bit/bitmap APIs, 61 * but using the out-of-line functions, so that the inline implementations 62 * can unconditionally dereference the pointer(s). 63 */ 64 #define small_const_nbits(nbits) \ 65 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0) 66 67 #endif /* __ASM_GENERIC_BITS_PER_LONG */ 68