tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git master head: 4c79594f528d6847963d0bea6a5f771704e8b02f commit: 0e61f7ea3b4a0a807009594f5a8f51bb7e15fbf4 [5/10] Merge branch 'locking/atomics' reproduce: # apt-get install sparse # sparse version: v0.6.1-180-g0558317d-dirty git checkout 0e61f7ea3b4a0a807009594f5a8f51bb7e15fbf4 make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) net/802/garp.c:583:9: sparse: expected void const volatile *ptr net/802/garp.c:583:9: sparse: got struct garp_applicant [noderef] <asn:4> *[noderef] <asn:4> * net/802/garp.c:583:9: sparse: sparse: cast removes address space '<asn:4>' of expression net/802/garp.c:583:9: sparse: expected void const volatile *ptr net/802/garp.c:583:9: sparse: got struct garp_applicant [noderef] <asn:4> *[noderef] <asn:4> * net/802/garp.c:583:9: sparse: sparse: cast removes address space '<asn:4>' of expression net/802/garp.c:222:9: sparse: sparse: cast truncates bits from constant value (100 becomes 0) net/802/garp.c:583:9: sparse: sparse: dereference of noderef expression net/802/garp.c:583:9: sparse: sparse: dereference of noderef expression -- net/802/mrp.c:864:9: sparse: expected void const volatile *ptr net/802/mrp.c:864:9: sparse: got struct mrp_applicant [noderef] <asn:4> *[noderef] <asn:4> * net/802/mrp.c:864:9: sparse: sparse: cast removes address space '<asn:4>' of expression net/802/mrp.c:864:9: sparse: expected void const volatile *ptr net/802/mrp.c:864:9: sparse: got struct mrp_applicant [noderef] <asn:4> *[noderef] <asn:4> * net/802/mrp.c:864:9: sparse: sparse: cast removes address space '<asn:4>' of expression net/802/mrp.c:864:9: sparse: sparse: dereference of noderef expression net/802/mrp.c:864:9: sparse: sparse: dereference of noderef expression vim +583 net/802/garp.c eca9ebac651f77 Patrick McHardy 2008-07-05 555 eca9ebac651f77 Patrick McHardy 2008-07-05 556 int garp_init_applicant(struct net_device *dev, struct garp_application *appl) eca9ebac651f77 Patrick McHardy 2008-07-05 557 { eca9ebac651f77 Patrick McHardy 2008-07-05 558 struct garp_applicant *app; eca9ebac651f77 Patrick McHardy 2008-07-05 559 int err; eca9ebac651f77 Patrick McHardy 2008-07-05 560 eca9ebac651f77 Patrick McHardy 2008-07-05 561 ASSERT_RTNL(); eca9ebac651f77 Patrick McHardy 2008-07-05 562 3cc77ec74e1583 Eric Dumazet 2010-10-24 563 if (!rtnl_dereference(dev->garp_port)) { eca9ebac651f77 Patrick McHardy 2008-07-05 564 err = garp_init_port(dev); eca9ebac651f77 Patrick McHardy 2008-07-05 565 if (err < 0) eca9ebac651f77 Patrick McHardy 2008-07-05 566 goto err1; eca9ebac651f77 Patrick McHardy 2008-07-05 567 } eca9ebac651f77 Patrick McHardy 2008-07-05 568 eca9ebac651f77 Patrick McHardy 2008-07-05 569 err = -ENOMEM; eca9ebac651f77 Patrick McHardy 2008-07-05 570 app = kzalloc(sizeof(*app), GFP_KERNEL); eca9ebac651f77 Patrick McHardy 2008-07-05 571 if (!app) eca9ebac651f77 Patrick McHardy 2008-07-05 572 goto err2; eca9ebac651f77 Patrick McHardy 2008-07-05 573 22bedad3ce112d Jiri Pirko 2010-04-01 574 err = dev_mc_add(dev, appl->proto.group_address); eca9ebac651f77 Patrick McHardy 2008-07-05 575 if (err < 0) eca9ebac651f77 Patrick McHardy 2008-07-05 576 goto err3; eca9ebac651f77 Patrick McHardy 2008-07-05 577 eca9ebac651f77 Patrick McHardy 2008-07-05 578 app->dev = dev; eca9ebac651f77 Patrick McHardy 2008-07-05 579 app->app = appl; eca9ebac651f77 Patrick McHardy 2008-07-05 580 app->gid = RB_ROOT; eca9ebac651f77 Patrick McHardy 2008-07-05 581 spin_lock_init(&app->lock); eca9ebac651f77 Patrick McHardy 2008-07-05 582 skb_queue_head_init(&app->queue); eca9ebac651f77 Patrick McHardy 2008-07-05 @583 rcu_assign_pointer(dev->garp_port->applicants[appl->type], app); e99e88a9d2b067 Kees Cook 2017-10-16 584 timer_setup(&app->join_timer, garp_join_timer, 0); eca9ebac651f77 Patrick McHardy 2008-07-05 585 garp_join_timer_arm(app); eca9ebac651f77 Patrick McHardy 2008-07-05 586 return 0; eca9ebac651f77 Patrick McHardy 2008-07-05 587 eca9ebac651f77 Patrick McHardy 2008-07-05 588 err3: eca9ebac651f77 Patrick McHardy 2008-07-05 589 kfree(app); eca9ebac651f77 Patrick McHardy 2008-07-05 590 err2: eca9ebac651f77 Patrick McHardy 2008-07-05 591 garp_release_port(dev); eca9ebac651f77 Patrick McHardy 2008-07-05 592 err1: eca9ebac651f77 Patrick McHardy 2008-07-05 593 return err; eca9ebac651f77 Patrick McHardy 2008-07-05 594 } eca9ebac651f77 Patrick McHardy 2008-07-05 595 EXPORT_SYMBOL_GPL(garp_init_applicant); eca9ebac651f77 Patrick McHardy 2008-07-05 596 :::::: The code at line 583 was first introduced by commit :::::: eca9ebac651f774d8b10fce7c5d173c3c3d3394f net: Add GARP applicant-only participant :::::: TO: Patrick McHardy <kaber(a)trash.net&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org