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Date: Sun, 24 Jul 2016 16:14:32 +1000
From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Jeremy Fitzhardinge <jeremy@goop.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Xen Devel <Xen-devel@lists.xensource.com>,
        Jens Axboe <axboe@kernel.dk>
Cc: linux-next@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jan Beulich <JBeulich@suse.com>, Mike Christie <mchristi@redhat.com>
Subject: linux-next: manual merge of the xen-tip tree with the block tree
Message-ID: <20160724161432.0f5a4011@canb.auug.org.au>
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Hi all,

Today's linux-next merge of the xen-tip tree got a conflict in:

  drivers/block/xen-blkfront.c

between commit:

  a418090aa88b ("block: do not use REQ_FLUSH for tracking flush support")

from the block tree and commit:

  ff595325ed55 ("xen-blkfront: prefer xenbus_scanf() over xenbus_gather()")

from the xen-tip tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc drivers/block/xen-blkfront.c
index ab382c7997b8,ca0536eb7037..000000000000
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@@ -2298,11 -2308,9 +2297,10 @@@ static void blkfront_gather_backend_fea
  	unsigned int indirect_segments;
  
  	info->feature_flush = 0;
 +	info->feature_fua = 0;
  
- 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- 			"feature-barrier", "%d", &barrier,
- 			NULL);
+ 	err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ 			   "feature-barrier", "%d", &barrier);
  
  	/*
  	 * If there's no "feature-barrier" defined, then it means
@@@ -2311,35 -2319,27 +2309,32 @@@
  	 *
  	 * If there are barriers, then we use flush.
  	 */
- 	if (!err && barrier) {
 -	if (err > 0 && barrier)
 -		info->feature_flush = REQ_FLUSH | REQ_FUA;
++	if (err > 0 && barrier) {
 +		info->feature_flush = 1;
 +		info->feature_fua = 1;
 +	}
 +
  	/*
  	 * And if there is "feature-flush-cache" use that above
  	 * barriers.
  	 */
- 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- 			"feature-flush-cache", "%d", &flush,
- 			NULL);
+ 	err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ 			   "feature-flush-cache", "%d", &flush);
  
- 	if (!err && flush) {
 -	if (err > 0 && flush)
 -		info->feature_flush = REQ_FLUSH;
++	if (err > 0 && flush) {
 +		info->feature_flush = 1;
 +		info->feature_fua = 0;
 +	}
  
- 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- 			"feature-discard", "%d", &discard,
- 			NULL);
+ 	err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ 			   "feature-discard", "%d", &discard);
  
- 	if (!err && discard)
+ 	if (err > 0 && discard)
  		blkfront_setup_discard(info);
  
- 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
- 			"feature-persistent", "%u", &persistent,
- 			NULL);
- 	if (err)
+ 	err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ 			   "feature-persistent", "%d", &persistent);
+ 	if (err <= 0)
  		info->feature_persistent = 0;
  	else
  		info->feature_persistent = persistent;