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Subject[tglx-devel:x86/fpu 62/77] arch/x86/kernel/fpu/xstate.c:1311:9: sparse: sparse: dereference of noderef expression
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/fpu
head: a365ccb2764d58791ee5946b16fa0ffceb17021f
commit: 1220c1c84393869a348163238581fef56cf60a84 [62/77] x86/arch_prctl: Add controls for dynamic XSTATE components
config: x86_64-randconfig-s021-20211011 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=1220c1c84393869a348163238581fef56cf60a84
git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
git fetch --no-tags tglx-devel x86/fpu
git checkout 1220c1c84393869a348163238581fef56cf60a84
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/fpu/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
arch/x86/kernel/fpu/xstate.c:1424:39: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@
arch/x86/kernel/fpu/xstate.c:1424:39: sparse: expected struct spinlock [usertype] *lock
arch/x86/kernel/fpu/xstate.c:1424:39: sparse: got struct spinlock [noderef] __rcu *
arch/x86/kernel/fpu/xstate.c:1427:41: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@
arch/x86/kernel/fpu/xstate.c:1427:41: sparse: expected struct spinlock [usertype] *lock
arch/x86/kernel/fpu/xstate.c:1427:41: sparse: got struct spinlock [noderef] __rcu *
>> arch/x86/kernel/fpu/xstate.c:1311:9: sparse: sparse: dereference of noderef expression

vim +1311 arch/x86/kernel/fpu/xstate.c

1304
1305 #ifdef CONFIG_DYNAMIC_SIGALTSTACK
1306 static int validate_sigaltstack(unsigned int usize)
1307 {
1308 struct task_struct *thread, *leader = current->group_leader;
1309 unsigned long framesize = get_sigframe_size();
1310
> 1311 assert_spin_locked(&current->sighand->siglock);
1312
1313 framesize += usize - fpu_user_cfg.default_size;
1314 for_each_thread(leader, thread) {
1315 if (thread->sas_ss_size && thread->sas_ss_size < framesize)
1316 return -ENOSPC;
1317 }
1318 return 0;
1319 }
1320

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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