[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

[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

[kbuild test robot]

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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@intel.com>

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':
>> arch/parisc/include/asm/pgtable.h:96:9: error: variable 'old_pte' set but not used [-Werror=unused-but-set-variable]
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':
>> arch/parisc/include/asm/pgtable.h:96:9: error: variable 'old_pte' set but not used [-Werror=unused-but-set-variable]
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@bell.net>
:::::: CC: Helge Deller <deller@gmx.de>

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

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