linux-kernel - drivers/xen/xenbus/xenbus_probe.c:755:37: sparse: sparse: incorrect type in assignment (different address spaces)

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Message-ID: <202205280304.kVBBNk9M-lkp@intel.com>
Date:   Sat, 28 May 2022 03:20:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luca Miccio <lucmiccio@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <stefano.stabellini@...inx.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: drivers/xen/xenbus/xenbus_probe.c:755:37: sparse: sparse: incorrect
 type in assignment (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7e284070abe53d448517b80493863595af4ab5f0
commit: 5b3353949e89d48b4faf54a9cc241ee5d70df615 xen: add support for initializing xenstore later as HVM domain
date:   8 days ago
config: x86_64-randconfig-s021 (https://download.01.org/0day-ci/archive/20220528/202205280304.kVBBNk9M-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-14-g5a0004b5-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5b3353949e89d48b4faf54a9cc241ee5d70df615
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5b3353949e89d48b4faf54a9cc241ee5d70df615
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/xen/xenbus/ kernel/ lib/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/xen/xenbus/xenbus_probe.c:755:37: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct xenstore_domain_interface *extern [addressable] [toplevel] xen_store_interface @@     got void [noderef] __iomem * @@
   drivers/xen/xenbus/xenbus_probe.c:755:37: sparse:     expected struct xenstore_domain_interface *extern [addressable] [toplevel] xen_store_interface
   drivers/xen/xenbus/xenbus_probe.c:755:37: sparse:     got void [noderef] __iomem *
   drivers/xen/xenbus/xenbus_probe.c:1011:45: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct xenstore_domain_interface *extern [addressable] [assigned] [toplevel] xen_store_interface @@     got void [noderef] __iomem * @@
   drivers/xen/xenbus/xenbus_probe.c:1011:45: sparse:     expected struct xenstore_domain_interface *extern [addressable] [assigned] [toplevel] xen_store_interface
   drivers/xen/xenbus/xenbus_probe.c:1011:45: sparse:     got void [noderef] __iomem *

vim +755 drivers/xen/xenbus/xenbus_probe.c

   749	
   750	static void xenbus_probe(void)
   751	{
   752		xenstored_ready = 1;
   753	
   754		if (!xen_store_interface) {
 > 755			xen_store_interface = xen_remap(xen_store_gfn << XEN_PAGE_SHIFT,
   756							XEN_PAGE_SIZE);
   757			/*
   758			 * Now it is safe to free the IRQ used for xenstore late
   759			 * initialization. No need to unbind: it is about to be
   760			 * bound again from xb_init_comms. Note that calling
   761			 * unbind_from_irqhandler now would result in xen_evtchn_close()
   762			 * being called and the event channel not being enabled again
   763			 * afterwards, resulting in missed event notifications.
   764			 */
   765			free_irq(xs_init_irq, &xb_waitq);
   766		}
   767	
   768		/*
   769		 * In the HVM case, xenbus_init() deferred its call to
   770		 * xs_init() in case callbacks were not operational yet.
   771		 * So do it now.
   772		 */
   773		if (xen_store_domain_type == XS_HVM)
   774			xs_init();
   775	
   776		/* Notify others that xenstore is up */
   777		blocking_notifier_call_chain(&xenstore_chain, 0, NULL);
   778	}
   779	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp