| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667 |
- /* 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/[email protected]/
- */
- #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 */
|
