[PATCH] Consolidate fallocate/fallocate64 implementations

[Arnd Bergmann]

On Monday, June 27, 2016 8:12:29 PM CEST Adhemerval Zanella wrote:
> 
> My mistake here, I was with the wrong assumption aarch64/ilp32 was
> following the already supported ilp32 architectures for passing
> off_t/off64_t (I still reading all the discussion for ilp32).
> 
> I see now correct way is indeed what Yuri Norov has suggested in
> the previous [1] thread:
> 
> fallocate.c
> #ifndef __OFF_T_MATCHES_OFF64_T
> /* build fallocate */
> #endif
> 
> and
> 
> fallocate64.c
> 
> /* build fallocate64 */
> #ifdef __OFF_T_MATCHES_OFF64_T
> weak_alias (fallocate64, fallocate)
> #endif

Right.

> I am assuming here aarch64/ilp32 is not defining __ASSUME_WORDSIZE64_ILP32
> (which I plan to check in the patchset).

Correct, that is the idea. We've gone back and forth on this quite a bit,
but this is the latest iteration after several reviewers pointed out that
handling the passing of 64-bit arguments for a small number of syscalls
adds a significant complexity for all other syscalls in the kernel since
it requires zeroing the upper register halves for almost all syscalls
without a way to do it during the syscall entry.

	Arnd