arch/x86_64/bits/limits.h


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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
 || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
#define PAGE_SIZE 4096
#define LONG_BIT 64
#endif

#define LONG_MAX  0x7fffffffffffffffL
#define LLONG_MAX  0x7fffffffffffffffLL