linux-kernel - drivers/vhost/vhost.c:718:3: error: call to '__compiletime_assert_718' declared with attribute error: BUILD_BUG_ON failed: __alignof__ *vq->avail > VRING_AVAIL_ALIGN

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Message-ID: <201603131054.jkF2zzr8%fengguang.wu@intel.com>
Date:	Sun, 13 Mar 2016 10:49:56 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: drivers/vhost/vhost.c:718:3: error: call to
 '__compiletime_assert_718' declared with attribute error: BUILD_BUG_ON
 failed: __alignof__ *vq->avail > VRING_AVAIL_ALIGN_SIZE

Hi Michael,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fda604a4daa19ead458ce5471892fa1d4b382d82
commit: 5d9a07b0de512b77bf28d2401e5fe3351f00a240 vhost: relax used address alignment
date:   1 year, 2 months ago
config: openrisc-allmodconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 5d9a07b0de512b77bf28d2401e5fe3351f00a240
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All errors (new ones prefixed by >>):

   drivers/vhost/vhost.c: In function 'vhost_vring_ioctl':
>> drivers/vhost/vhost.c:718:3: error: call to '__compiletime_assert_718' declared with attribute error: BUILD_BUG_ON failed: __alignof__ *vq->avail > VRING_AVAIL_ALIGN_SIZE

vim +/__compiletime_assert_718 +718 drivers/vhost/vhost.c

   712			    (u64)(unsigned long)a.avail_user_addr != a.avail_user_addr) {
   713				r = -EFAULT;
   714				break;
   715			}
   716	
   717			/* Make sure it's safe to cast pointers to vring types. */
 > 718			BUILD_BUG_ON(__alignof__ *vq->avail > VRING_AVAIL_ALIGN_SIZE);
   719			BUILD_BUG_ON(__alignof__ *vq->used > VRING_USED_ALIGN_SIZE);
   720			if ((a.avail_user_addr & (VRING_AVAIL_ALIGN_SIZE - 1)) ||
   721			    (a.used_user_addr & (VRING_USED_ALIGN_SIZE - 1)) ||

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Download attachment ".config.gz" of type "application/octet-stream" (32019 bytes)