tree: https://github.com/weiny2/linux-kernel.git lm-misc head: 8c385a87dc5cb4d98fa417d3dd9481f3fbe4c625 commit: 8c385a87dc5cb4d98fa417d3dd9481f3fbe4c625 [8/8] arch/kunmap_atomic: Consolidate duplicate code reproduce: # apt-get install sparse # sparse version: v0.6.1-191-gc51a0382-dirty git checkout 8c385a87dc5cb4d98fa417d3dd9481f3fbe4c625 make ARCH=x86_64 allmodconfig make C=1 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 >>) drivers/gpu/drm/gma500/mmu.c:316:19: sparse: sparse: symbol 'psb_mmu_pt_alloc_map_lock' was not declared. Should it be static? drivers/gpu/drm/gma500/mmu.c:420:10: sparse: sparse: symbol 'psb_get_default_pd_addr' was not declared. Should it be static? drivers/gpu/drm/gma500/mmu.c:316:19: sparse: sparse: context imbalance in 'psb_mmu_pt_alloc_map_lock' - wrong count at exit drivers/gpu/drm/gma500/mmu.c:356:26: sparse: sparse: context imbalance in 'psb_mmu_pt_map_lock' - wrong count at exit vim +/psb_mmu_pt_unmap_unlock +199 include/linux/uaccess.h a866374aecc90c Peter Zijlstra 2006-12-06 192 a866374aecc90c Peter Zijlstra 2006-12-06 193 static inline void pagefault_enable(void) a866374aecc90c Peter Zijlstra 2006-12-06 194 { a866374aecc90c Peter Zijlstra 2006-12-06 195 /* a866374aecc90c Peter Zijlstra 2006-12-06 196 * make sure to issue those last loads/stores before enabling a866374aecc90c Peter Zijlstra 2006-12-06 197 * the pagefault handler again. a866374aecc90c Peter Zijlstra 2006-12-06 198 */ a866374aecc90c Peter Zijlstra 2006-12-06 @199 barrier(); 8bcbde5480f977 David Hildenbrand 2015-05-11 200 pagefault_disabled_dec(); a866374aecc90c Peter Zijlstra 2006-12-06 201 } a866374aecc90c Peter Zijlstra 2006-12-06 202 :::::: The code at line 199 was first introduced by commit :::::: a866374aecc90c7d90619727ccd851ac096b2fc7 [PATCH] mm: pagefault_{disable,enable}() :::::: TO: Peter Zijlstra <a.p.zijlstra(a)chello.nl&gt; :::::: CC: Linus Torvalds <torvalds(a)woody.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org