Re: [PATCH][RFC] io_uring: Fix io_uring_mmu_get_unmapped_area() for IA-64

[Jens Axboe <axboe@kernel.dk>]

On 7/19/23 3:20?PM, Helge Deller wrote:
> The io_uring testcase is broken on IA-64 since commit d808459b2e31
> ("io_uring: Adjust mapping wrt architecture aliasing requirements").
> 
> The reason is, that this commit introduced an own architecture
> independend get_unmapped_area() search algorithm which doesn't suite the
> memory region requirements for IA-64.
> 
> To avoid similar problems in the future it's better to switch back to
> the architecture-provided get_unmapped_area() function and adjust the
> needed input parameters before the call.  Additionally
> io_uring_mmu_get_unmapped_area() will now become easier to understand
> and maintain.
> 
> This patch has been tested on physical IA-64 and PA-RISC machines,
> without any failures in the io_uring testcases. On PA-RISC the
> LTP mmmap testcases did not report any regressions either.
> 
> I don't expect issues for other architectures, but it would be nice if
> this patch could be tested on other machines too.

Any comments from the IA64 folks?

Helge, should this be split into three patches? One for hppa, one for
ia64, and then the io_uring one?

-- 
Jens Axboe