EXTRACT_TOP_BIT    73 maint/gnulib/lib/fsusage.c #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
EXTRACT_TOP_BIT   131 maint/gnulib/lib/fsusage.c       fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (vfsd.f_bavail) != 0;
EXTRACT_TOP_BIT   225 maint/gnulib/lib/fsusage.c   fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;