linux-headers/asm-generic/bitsperlong.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef __ASM_GENERIC_BITS_PER_LONG
   3 #define __ASM_GENERIC_BITS_PER_LONG
   4
   5 #ifndef __BITS_PER_LONG
   6 /*
   7  * In order to keep safe and avoid regression, only unify uapi
   8  * bitsperlong.h for some archs which are using newer toolchains
   9  * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
  10  * See the following link for more info:
  11  * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
  12  */
  13 #if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
  14 #define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
  15 #else
  16 /*
  17  * There seems to be no way of detecting this automatically from user
  18  * space, so 64 bit architectures should override this in their
  19  * bitsperlong.h. In particular, an architecture that supports
  20  * both 32 and 64 bit user space must not rely on CONFIG_64BIT
  21  * to decide it, but rather check a compiler provided macro.
  22  */
  23 #define __BITS_PER_LONG 32
  24 #endif
  25 #endif
  26
  27 #ifndef __BITS_PER_LONG_LONG
  28 #define __BITS_PER_LONG_LONG 64
  29 #endif
  30
  31 #endif /* __ASM_GENERIC_BITS_PER_LONG */