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Date: Fri, 3 May 2013 10:54:22 +0200
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130503085422.GA24864@stefanha-thinkpad.redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 1/6] hostmem: make hostmem single,
 not per Vring related
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To: Liu Ping Fan <qemulist@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Anthony Liguori <aliguori@us.ibm.com>, Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel@nongnu.org, Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

On Fri, May 03, 2013 at 10:45:17AM +0800, Liu Ping Fan wrote:
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index 9e88320..2761668 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -887,6 +887,7 @@ void *address_space_map(AddressSpace *as, hwaddr addr,
>  void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
>                           int is_write, hwaddr access_len);
>  
> +void hostmem_init(void);

This should go in hostmem.h.  exec.c must now include hostmem.h.

You need to take care of the ./configure dependency: hostmem.o is only
build when CONFIG_VIRTIO_BLK_DATA_PLANE is 'y'.