[kbuild-all] [zen-kernel-zen-kernel:5.6/zen-sauce 2/26] arch/parisc/include/asm/pgtable.h:96:9: error: variable 'old_pte' set but not used

tree: https://github.com/zen-kernel/zen-kernel 5.6/zen-sauce head: 28b9700a330bb5957c6ad7263095d148d5c35242 commit: 571a78afe655a6e606ff127b57f7a01d3bc68614 [2/26] ZEN: Add VHBA driver config: parisc-allyesconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 571a78afe655a6e606ff127b57f7a01d3bc68614 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/mm.h:94, from include/linux/highmem.h:8, from drivers/scsi/vhba/vhba.c:25: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': 96 | pte_t old_pte; | ^~~~~~~ arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at' 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:201:2: note: in expansion of macro 'pte_clear' 201 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': 96 | pte_t old_pte; | ^~~~~~~ include/asm-generic/pgtable.h:640:2: note: in expansion of macro 'set_pte_at' 640 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ In file included from drivers/scsi/vhba/vhba.c:42: drivers/scsi/vhba/vhba.c: At top level: drivers/scsi/vhba/vhba.c:483:15: error: no previous prototype for 'vhba_queuecommand' [-Werror=missing-prototypes] 483 | DEF_SCSI_QCMD(vhba_queuecommand) | ^~~~~~~~~~~~~~~~~ include/scsi/scsi_host.h:488:6: note: in definition of macro 'DEF_SCSI_QCMD' 488 | int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | ^~~~~~~~~ cc1: all warnings being treated as errors vim +/old_pte +96 arch/parisc/include/asm/pgtable.h 01ab60570427ca arch/parisc/include/asm/pgtable.h John David Anglin 2015-07-01 84 ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 85 /* Certain architectures need to do special things when PTEs ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 86 * within a page table are directly modified. Thus, the following ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 87 * hook is made available. ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 88 */ ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 89 #define set_pte(pteptr, pteval) \ ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 90 do{ \ ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 91 *(pteptr) = (pteval); \ ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 92 } while(0) 7139bc1579901b arch/parisc/include/asm/pgtable.h John David Anglin 2013-01-14 93 7139bc1579901b arch/parisc/include/asm/pgtable.h John David Anglin 2013-01-14 94 #define set_pte_at(mm, addr, ptep, pteval) \ 7139bc1579901b arch/parisc/include/asm/pgtable.h John David Anglin 2013-01-14 95 do { \ 01ab60570427ca arch/parisc/include/asm/pgtable.h John David Anglin 2015-07-01 @96 pte_t old_pte; \ bda079d336cd81 arch/parisc/include/asm/pgtable.h John David Anglin 2013-04-23 97 unsigned long flags; \ b37d1c1898b288 arch/parisc/include/asm/pgtable.h Mikulas Patocka 2019-04-28 98 spin_lock_irqsave(pgd_spinlock((mm)->pgd), flags);\ 01ab60570427ca arch/parisc/include/asm/pgtable.h John David Anglin 2015-07-01 99 old_pte = *ptep; \ 4dd5b673fa625d arch/parisc/include/asm/pgtable.h John David Anglin 2018-09-20 100 set_pte(ptep, pteval); \ 7139bc1579901b arch/parisc/include/asm/pgtable.h John David Anglin 2013-01-14 101 purge_tlb_entries(mm, addr); \ b37d1c1898b288 arch/parisc/include/asm/pgtable.h Mikulas Patocka 2019-04-28 102 spin_unlock_irqrestore(pgd_spinlock((mm)->pgd), flags);\ 7139bc1579901b arch/parisc/include/asm/pgtable.h John David Anglin 2013-01-14 103 } while (0) ^1da177e4c3f41 include/asm-parisc/pgtable.h Linus Torvalds 2005-04-16 104 :::::: The code at line 96 was first introduced by commit :::::: 01ab60570427caa24b9debc369e452e86cd9beb4 parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results :::::: TO: John David Anglin <dave.anglin(a)bell.net&gt; :::::: CC: Helge Deller <deller(a)gmx.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org