linux-kernel - Re: [PATCH v7 13/13] xen: introduce a Kconfig option to enable the pvcalls frontend

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Message-ID: <0ffb5e07-1db5-dcc6-786c-ef1ef1451d76@oracle.com>
Date:   Mon, 30 Oct 2017 11:22:05 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>
Cc:     xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org,
        jgross@...e.com, Stefano Stabellini <stefano@...reto.com>
Subject: Re: [PATCH v7 13/13] xen: introduce a Kconfig option to enable the
 pvcalls frontend

On 10/26/2017 04:45 PM, Boris Ostrovsky wrote:
> On 10/26/2017 04:16 PM, Stefano Stabellini wrote:
>> On Thu, 26 Oct 2017, Boris Ostrovsky wrote:
>>> On 10/26/2017 03:11 PM, Stefano Stabellini wrote:
>>>> Also add pvcalls-front to the Makefile.
>>>>
>>>> Signed-off-by: Stefano Stabellini <stefano@...reto.com>
>>>> CC: boris.ostrovsky@...cle.com
>>>> CC: jgross@...e.com
>>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>> Thank you!!
>>
>> The series is fully acked now. I guess it could be added to xentip?
>> Maybe for v4.15?
>
> Yes, that's the plan unless other reviews come in. I will probably
> create the branch on Monday (assuming rc7 will be the last rc for 4.14).
> It's later than usual but we haven't had anything for 4.15.
>
> -boris

Build warnings (gcc (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1))

/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘__write_ring’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:459:3: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
   copy_from_iter(data->out + masked_prod, len, msg_iter);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:462:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out + masked_prod,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            array_size - masked_prod, msg_iter);
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:464:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out,
    ^~~~~~~~~~~~~~~~~~~~~~~~~
            len - (array_size - masked_prod),
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            msg_iter);
            ~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:468:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out + masked_prod, len, msg_iter);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘__read_ring’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:560:3: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
   copy_to_iter(data->in + masked_cons, len, msg_iter);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:563:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in + masked_cons,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          array_size - masked_cons, msg_iter);
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:565:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in,
    ^~~~~~~~~~~~~~~~~~~~~~
          len - (array_size - masked_cons),
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          msg_iter);
          ~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:569:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in + masked_cons, len, msg_iter);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




Slightly different on 32 bit:

/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_event_handler’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:160:31: warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]
    struct sock_mapping *map = (struct sock_mapping *)
                               ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_socket’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:283:21: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.socket.id = (uint64_t) map;
                     ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_connect’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:405:22: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.connect.id = (uint64_t)map;
                      ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_bind’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:660:19: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.bind.id = (uint64_t)map;
                   ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_listen’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:722:21: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.listen.id = (uint64_t) map;
                     ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_accept’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:826:21: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.accept.id = (uint64_t) map;
                     ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:828:25: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.accept.id_new = (uint64_t) map2;
                         ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_poll_passive’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:922:19: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.poll.id = (uint64_t) map;
                   ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘pvcalls_front_release’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:1020:22: warning:
cast from pointer to integer of different size [-Wpointer-to-int-cast]
  req->u.release.id = (uint64_t)map;
                      ^
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘__write_ring’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:459:3: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
   copy_from_iter(data->out + masked_prod, len, msg_iter);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:462:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out + masked_prod,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            array_size - masked_prod, msg_iter);
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:464:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out,
    ^~~~~~~~~~~~~~~~~~~~~~~~~
            len - (array_size - masked_prod),
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            msg_iter);
            ~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:468:4: warning:
ignoring return value of ‘copy_from_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_from_iter(data->out + masked_prod, len, msg_iter);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c: In function
‘__read_ring’:
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:560:3: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
   copy_to_iter(data->in + masked_cons, len, msg_iter);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:563:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in + masked_cons,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          array_size - masked_cons, msg_iter);
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:565:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in,
    ^~~~~~~~~~~~~~~~~~~~~~
          len - (array_size - masked_cons),
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          msg_iter);
          ~~~~~~~~~
/data/upstream/linux-xen/drivers/xen/pvcalls-front.c:569:4: warning:
ignoring return value of ‘copy_to_iter’, declared with attribute
warn_unused_result [-Wunused-result]
    copy_to_iter(data->in + masked_cons, len, msg_iter);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


-boris