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The generic Linux struct_stat misses the conditionals to use bits/struct_stat_time64_helper.h in the __USE_TIME_BITS64 for architecture that uses __TIMESIZE == 32 (currently csky and nios2). Since newer ports should not support 32 bit time_t, the generic implementation should be used as default. For arm, hppa, and sh a copy of default struct_stat is added, while for csky and nios a new one based on generic is used, along with conditionals to use bits/struct_stat_time64_helper.h. The default struct_stat is also replaced with the generic one. Checked on aarch64-linux-gnu and arm-linux-gnueabihf.
This hierarchy supports Linux systems using the new asm-generic/unistd.h, which removes many familiar old syscalls. For example, to implement open(), newer Linux architectures require glibc to invoke the __NR_openat syscall with AT_FDCWD. This hierarchy provides all those implementations. It also provides support for 32-bit platforms using the 64-bit kernel syscall APIs, as the 32-bit ones are no longer provided. Note that newer ILP32 environments (x32 or AArch64:ILP32, for example) are converting to use more 64-bit types in kernel syscalls, so that aspect of this support is in more flux as of this writing.