linux-kernel - drivers/virtio/virtio_balloon.o: warning: objtool: release_pages_balloon()+0x98: function has unreachable instruction

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Date:	Wed, 20 Jul 2016 01:33:15 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: drivers/virtio/virtio_balloon.o: warning: objtool:
 release_pages_balloon()+0x98: function has unreachable instruction

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   47ef4ad2684d380dd6d596140fb79395115c3950
commit: 87c9403b0d1de4676b0bd273eea68fcf6de68e68 virtio_balloon: fix PFN format for virtio-1
date:   8 weeks ago
config: x86_64-randconfig-a0-07191719 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 87c9403b0d1de4676b0bd273eea68fcf6de68e68
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/virtio/virtio_balloon.c: In function 'update_balloon_stats':
   drivers/virtio/virtio_balloon.c:249: warning: 'events[2]' is used uninitialized in this function
   drivers/virtio/virtio_balloon.c:251: warning: 'events[3]' is used uninitialized in this function
   drivers/virtio/virtio_balloon.c:232: warning: 'events[12]' is used uninitialized in this function
   drivers/virtio/virtio_balloon.c:239: note: 'events[12]' was declared here
   drivers/virtio/virtio_balloon.c:232: warning: 'events[11]' is used uninitialized in this function
   drivers/virtio/virtio_balloon.c:239: note: 'events[11]' was declared here
>> drivers/virtio/virtio_balloon.o: warning: objtool: release_pages_balloon()+0x98: function has unreachable instruction

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