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migration/rdma: clang compilation fix

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Configuring QEMU with:
        ../configure --cc=clang --enable-rdma

Leads to compilation error:

  CC      migration/rdma.o
  CC      migration/block.o
  qemu/migration/rdma.c:3615:58: error: taking address of packed member 'rkey' of class or structure
      'RDMARegisterResult' may result in an unaligned pointer value [-Werror,-Waddress-of-packed-member]
                            (uintptr_t)host_addr, NULL, &reg_result->rkey,
                                                         ^~~~~~~~~~~~~~~~
Fix it by using a temp local variable.

Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Message-Id: <20190304184923.24215-1-marcel.apfelbaum@gmail.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2019-03-04 20:49:23 +02:00 committed by Dr. David Alan Gilbert
parent 892ae715b6
commit 9589e76301
1 changed files with 4 additions and 1 deletions
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5
migration/rdma.c
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@ -3613,13 +3613,16 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
}
chunk_start = ram_chunk_start(block, chunk);
chunk_end = ram_chunk_end(block, chunk + reg->chunks);
/* avoid "-Waddress-of-packed-member" warning */
uint32_t tmp_rkey = 0;
if (qemu_rdma_register_and_get_keys(rdma, block,
(uintptr_t)host_addr, NULL, &reg_result->rkey,
(uintptr_t)host_addr, NULL, &tmp_rkey,
chunk, chunk_start, chunk_end)) {
error_report("cannot get rkey");
ret = -EINVAL;
goto out;
}
reg_result->rkey = tmp_rkey;
reg_result->host_addr = (uintptr_t)block->local_host_addr;