tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/kcsan head: ffed638b6a2180da8fd002a46632d746af72b299 commit: bbfa112b46bdbbdfc2f5bfb9c2dcbef780ff6417 [12/21] READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() config: x86_64-randconfig-s002-20200524 (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout bbfa112b46bdbbdfc2f5bfb9c2dcbef780ff6417 # 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: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +/unmap_ldt_struct +61 arch/x86/include/asm/pgtable_64.h 0814e0bace537b7 include/asm-x86/pgtable_64.h Eduardo Habkost 2008-06-25 58 9bc4f28af75a91a arch/x86/include/asm/pgtable_64.h Nadav Amit 2018-09-02 59 static inline void native_set_pte(pte_t *ptep, pte_t pte) ^1da177e4c3f415 include/asm-x86_64/pgtable.h Linus Torvalds 2005-04-16 60 { 9bc4f28af75a91a arch/x86/include/asm/pgtable_64.h Nadav Amit 2018-09-02 @61 WRITE_ONCE(*ptep, pte); ^1da177e4c3f415 include/asm-x86_64/pgtable.h Linus Torvalds 2005-04-16 62 } ^1da177e4c3f415 include/asm-x86_64/pgtable.h Linus Torvalds 2005-04-16 63 :::::: The code at line 61 was first introduced by commit :::::: 9bc4f28af75a91aea0ae383f50b0a430c4509303 x86/mm: Use WRITE_ONCE() when setting PTEs :::::: TO: Nadav Amit <namit(a)vmware.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