tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: af7b4801030c07637840191c69eb666917e4135d commit: 58b09919626bf9067345289212ec030c61eb1034 mptcp: create msk early date: 3 months ago config: x86_64-randconfig-s022-20200608 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-247-gcadbd124-dirty git checkout 58b09919626bf9067345289212ec030c61eb1034 # save the attached .config to linux build tree make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +/mptcp_sk_clone +650 arch/x86/include/asm/paravirt.h f233f7f1581e78 Peter Zijlstra (Intel 2015-04-24 647) f233f7f1581e78 Peter Zijlstra (Intel 2015-04-24 648) static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock) f233f7f1581e78 Peter Zijlstra (Intel 2015-04-24 649) { 5c83511bdb9832 Juergen Gross 2018-08-28 @650 PVOP_VCALLEE1(lock.queued_spin_unlock, lock); f233f7f1581e78 Peter Zijlstra (Intel 2015-04-24 651) } f233f7f1581e78 Peter Zijlstra (Intel 2015-04-24 652) :::::: The code at line 650 was first introduced by commit :::::: 5c83511bdb9832c86be20fb86b783356e2f58062 x86/paravirt: Use a single ops structure :::::: TO: Juergen Gross <jgross(a)suse.com&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org