Re: liburing test results on hppa

[Jens Axboe <axboe@kernel.dk>]

On 2/16/23 4:26?PM, John David Anglin wrote:
> On 2023-02-16 6:12 p.m., Jens Axboe wrote:
>> On 2/16/23 4:00?PM, John David Anglin wrote:
>>> Running test buf-ring.t bad run 0/0 = -233
>>> test_running(1) failed
>>> Test buf-ring.t failed with ret 1
>> As mentioned previously, this one and the other -233 I suspect are due
>> to the same coloring issue as was fixed by Helge's patch for the ring
>> mmaps, as the provided buffer rings work kinda the same way. The
>> application allocates some aligned memory, and registers it and the
>> kernel then maps it.
>>
>> I wonder if these would work properly if the address was aligned to
>> 0x400000? Should be easy to verify, just modify the alignment for the
>> posix_memalign() calls in test/buf-ring.c.
> Doesn't help.  Same error.  Can you point to where the kernel maps it?

Yep, it goes io_uring.c:io_uring_register() ->
kbuf.c:io_register_pbuf_ring() -> rsrc.c:io_pin_pages() which ultimately
calls pin_user_pages() to map the memory.

-- 
Jens Axboe