[kbuild-all] fs/proc/task_nommu.c:67:55: sparse: sparse: incorrect type in argument 1 (different address spaces)

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: caffb99b6929f41a69edbb5aef3a359bf45f3315 commit: 913292c97d750fe4188b4f5aa770e5e0ca1e5a91 sched.h: Annotate sighand_struct with __rcu date: 4 months ago config: c6x-randconfig-s002-20200524 (attached as .config) compiler: c6x-elf-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout 913292c97d750fe4188b4f5aa770e5e0ca1e5a91 # save the attached .config to linux build tree make W=1 C=1 ARCH=c6x CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) fs/proc/task_nommu.c:67:55: sparse: expected struct refcount_struct const [usertype] *r fs/proc/task_nommu.c:67:55: sparse: got struct refcount_struct [noderef] <asn:4> * fs/proc/task_nommu.c:68:43: sparse: expected void const *objp fs/proc/task_nommu.c:68:43: sparse: got struct sighand_struct [noderef] <asn:4> *sighand fs/proc/task_nommu.c:70:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const *objp @@ got struct sighand_struct [noderevoid const *objp @@ fs/proc/task_nommu.c:70:42: sparse: expected void const *objp fs/proc/task_nommu.c:70:42: sparse: got struct sighand_struct [noderef] <asn:4> *sighand vim +67 fs/proc/task_nommu.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 14 ^1da177e4c3f41 Linus Torvalds 2005-04-16 15 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 16 * Logic: we've got two memory sums for each process, "shared", and 025dfdafe77f20 Frederik Schwarzer 2008-10-16 17 * "non-shared". Shared memory may get counted more than once, for ^1da177e4c3f41 Linus Torvalds 2005-04-16 18 * each process that owns it. Non-shared memory is counted ^1da177e4c3f41 Linus Torvalds 2005-04-16 19 * accurately. ^1da177e4c3f41 Linus Torvalds 2005-04-16 20 */ df5f8314ca30d6 Eric W. Biederman 2008-02-08 21 void task_mem(struct seq_file *m, struct mm_struct *mm) ^1da177e4c3f41 Linus Torvalds 2005-04-16 22 { 8feae13110d60c David Howells 2009-01-08 23 struct vm_area_struct *vma; 38f714795b7cf4 David Howells 2009-01-08 24 struct vm_region *region; 8feae13110d60c David Howells 2009-01-08 25 struct rb_node *p; 38f714795b7cf4 David Howells 2009-01-08 26 unsigned long bytes = 0, sbytes = 0, slack = 0, size; ^1da177e4c3f41 Linus Torvalds 2005-04-16 27 ^1da177e4c3f41 Linus Torvalds 2005-04-16 28 down_read(&mm->mmap_sem); 8feae13110d60c David Howells 2009-01-08 29 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { 8feae13110d60c David Howells 2009-01-08 30 vma = rb_entry(p, struct vm_area_struct, vm_rb); ^1da177e4c3f41 Linus Torvalds 2005-04-16 31 8feae13110d60c David Howells 2009-01-08 32 bytes += kobjsize(vma); 38f714795b7cf4 David Howells 2009-01-08 33 38f714795b7cf4 David Howells 2009-01-08 34 region = vma->vm_region; 38f714795b7cf4 David Howells 2009-01-08 35 if (region) { 38f714795b7cf4 David Howells 2009-01-08 36 size = kobjsize(region); 38f714795b7cf4 David Howells 2009-01-08 37 size += region->vm_end - region->vm_start; 38f714795b7cf4 David Howells 2009-01-08 38 } else { 38f714795b7cf4 David Howells 2009-01-08 39 size = vma->vm_end - vma->vm_start; 38f714795b7cf4 David Howells 2009-01-08 40 } 38f714795b7cf4 David Howells 2009-01-08 41 ^1da177e4c3f41 Linus Torvalds 2005-04-16 42 if (atomic_read(&mm->mm_count) > 1 || 8feae13110d60c David Howells 2009-01-08 43 vma->vm_flags & VM_MAYSHARE) { 38f714795b7cf4 David Howells 2009-01-08 44 sbytes += size; ^1da177e4c3f41 Linus Torvalds 2005-04-16 45 } else { 38f714795b7cf4 David Howells 2009-01-08 46 bytes += size; 38f714795b7cf4 David Howells 2009-01-08 47 if (region) 38f714795b7cf4 David Howells 2009-01-08 48 slack = region->vm_end - vma->vm_end; ^1da177e4c3f41 Linus Torvalds 2005-04-16 49 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 50 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 51 ^1da177e4c3f41 Linus Torvalds 2005-04-16 52 if (atomic_read(&mm->mm_count) > 1) ^1da177e4c3f41 Linus Torvalds 2005-04-16 53 sbytes += kobjsize(mm); ^1da177e4c3f41 Linus Torvalds 2005-04-16 54 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 55 bytes += kobjsize(mm); ^1da177e4c3f41 Linus Torvalds 2005-04-16 56 498052bba55eca Al Viro 2009-03-30 57 if (current->fs && current->fs->users > 1) ^1da177e4c3f41 Linus Torvalds 2005-04-16 58 sbytes += kobjsize(current->fs); ^1da177e4c3f41 Linus Torvalds 2005-04-16 59 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 60 bytes += kobjsize(current->fs); ^1da177e4c3f41 Linus Torvalds 2005-04-16 61 ^1da177e4c3f41 Linus Torvalds 2005-04-16 62 if (current->files && atomic_read(&current->files->count) > 1) ^1da177e4c3f41 Linus Torvalds 2005-04-16 63 sbytes += kobjsize(current->files); ^1da177e4c3f41 Linus Torvalds 2005-04-16 64 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 65 bytes += kobjsize(current->files); ^1da177e4c3f41 Linus Torvalds 2005-04-16 66 d036bda7d0e726 Elena Reshetova 2019-01-18 @67 if (current->sighand && refcount_read(&current->sighand->count) > 1) ^1da177e4c3f41 Linus Torvalds 2005-04-16 @68 sbytes += kobjsize(current->sighand); ^1da177e4c3f41 Linus Torvalds 2005-04-16 69 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 70 bytes += kobjsize(current->sighand); ^1da177e4c3f41 Linus Torvalds 2005-04-16 71 ^1da177e4c3f41 Linus Torvalds 2005-04-16 72 bytes += kobjsize(current); /* includes kernel stack */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 73 df5f8314ca30d6 Eric W. Biederman 2008-02-08 74 seq_printf(m, ^1da177e4c3f41 Linus Torvalds 2005-04-16 75 "Mem:\t%8lu bytes\n" ^1da177e4c3f41 Linus Torvalds 2005-04-16 76 "Slack:\t%8lu bytes\n" ^1da177e4c3f41 Linus Torvalds 2005-04-16 77 "Shared:\t%8lu bytes\n", ^1da177e4c3f41 Linus Torvalds 2005-04-16 78 bytes, slack, sbytes); ^1da177e4c3f41 Linus Torvalds 2005-04-16 79 ^1da177e4c3f41 Linus Torvalds 2005-04-16 80 up_read(&mm->mmap_sem); ^1da177e4c3f41 Linus Torvalds 2005-04-16 81 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 82 :::::: The code at line 67 was first introduced by commit :::::: d036bda7d0e7269c2982eb979acfef855f5d7977 sched/core: Convert sighand_struct.count to refcount_t :::::: TO: Elena Reshetova <elena.reshetova(a)intel.com&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org