Re: [Xen-devel] [PATCH v3 1/2] Revert xen/io/ring.h of "Clean up a few header guard symbols"

[Daniel P. Berrangé <berrange@xxxxxxxxxx>]

On Fri, Jun 21, 2019 at 11:54:40AM +0100, Anthony PERARD wrote:
> This reverts changes to include/hw/xen/io/ring.h from commit
> 37677d7db39a3c250ad661d00fb7c3b59d047b1f.
> 
> Following 37677d7db3 "Clean up a few header guard symbols", QEMU start
> to fail to build:
> 
> In file included from ~/xen/tools/../tools/include/xen/io/blkif.h:31:0,
>                  from ~/xen/tools/qemu-xen-dir/hw/block/xen_blkif.h:5,
>                  from ~/xen/tools/qemu-xen-dir/hw/block/xen-block.c:22:
> ~/xen/tools/../tools/include/xen/io/ring.h:68:0: error: "__CONST_RING_SIZE" 
> redefined [-Werror]
>  #define __CONST_RING_SIZE(_s, _sz) \
> 
> In file included from ~/xen/tools/qemu-xen-dir/hw/block/xen_blkif.h:4:0,
>                  from ~/xen/tools/qemu-xen-dir/hw/block/xen-block.c:22:
> ~/xen/tools/qemu-xen-dir/include/hw/xen/io/ring.h:66:0: note: this is the 
> location of the previous definition
>  #define __CONST_RING_SIZE(_s, _sz) \
> 
> The issue is that some public xen headers have been imported (by
> f65eadb639 "xen: import ring.h from xen") but not all. With the change
> in the guards symbole, the ring.h header start to be imported twice.
> 
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> ---
> CC: Markus Armbruster <armbru@xxxxxxxxxx>
> ---
> 
> Notes:
>     v3:
>     - new patch, replace "xen: Fix build with public headers" from previous
>       patch series version
>     - Revert problematic change instead.
> 
>  include/hw/xen/io/ring.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>


Regards,
Daniel
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