[RFC6 PATCH v6 00/21] ILP32 for ARM64

[Joseph Myers]

On Tue, 17 May 2016, Szabolcs Nagy wrote:

> i think even legacy software should be able to deal with 64bit off_t,
> so we could avoid having two sets of filesystem apis or is 64bit-only
> off_t more work to do in linux/glibc?

wordsize-64 directories generally expect 64-bit interfaces.  wordsize-32 
directories generally expect that there are two sets of filesystem APIs 
which are not aliased (at the userspace level - the versions for the 
generic syscall API deal with setting EOVERFLOW in userspace as needed).

The "wordsize" concept is not wonderfully well-defined and could do with 
being split up into multiple better-defined concepts, but that's obvious 
something pretty tricky to get right, involving a very careful analysis of 
the existing code.

-- 
Joseph S. Myers
joseph at codesourcery.com