/usr/include/x86_64-linux-gnu/asm/bitsperlong.h is in linux-libc-dev 4.4.0-21.37.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #ifndef __ASM_X86_BITSPERLONG_H
#define __ASM_X86_BITSPERLONG_H
#if defined(__x86_64__) && !defined(__ILP32__)
# define __BITS_PER_LONG 64
#else
# define __BITS_PER_LONG 32
#endif
#include <asm-generic/bitsperlong.h>
#endif /* __ASM_X86_BITSPERLONG_H */
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