arch/parisc/kernel/traps.c:806:14: warning: variable 'hpmcp' set but not used

arch/parisc/kernel/traps.c:806:14: warning: variable 'hpmcp' set but not used

[kernel test robot]

Hi Sven,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b253435746d9a4a701b5f09211b9c14d3370d0da
commit: c70919bd9d0782a6078ccd37d7f861d514f5481e parisc: Fix IVT checksum calculation wrt HPMC
date:   1 year, 2 months ago
config: parisc-randconfig-r031-20220420 (https://download.01.org/0day-ci/archive/20220421/202204210504.e7yvq7aa-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c70919bd9d0782a6078ccd37d7f861d514f5481e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c70919bd9d0782a6078ccd37d7f861d514f5481e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   arch/parisc/kernel/traps.c: In function 'initialize_ivt':
>> arch/parisc/kernel/traps.c:806:14: warning: variable 'hpmcp' set but not used [-Wunused-but-set-variable]
     806 |         u32 *hpmcp;
         |              ^~~~~


vim +/hpmcp +806 arch/parisc/kernel/traps.c

^1da177e4c3f415 Linus Torvalds    2005-04-16  797  
^1da177e4c3f415 Linus Torvalds    2005-04-16  798  
4182d0cdf853fb0 Helge Deller      2015-11-20  799  void __init initialize_ivt(const void *iva)
^1da177e4c3f415 Linus Torvalds    2005-04-16  800  {
c3d4ed4e3e5aa8d Kyle McMartin     2007-06-04  801  	extern const u32 os_hpmc[];
c3d4ed4e3e5aa8d Kyle McMartin     2007-06-04  802  
^1da177e4c3f415 Linus Torvalds    2005-04-16  803  	int i;
^1da177e4c3f415 Linus Torvalds    2005-04-16  804  	u32 check = 0;
^1da177e4c3f415 Linus Torvalds    2005-04-16  805  	u32 *ivap;
^1da177e4c3f415 Linus Torvalds    2005-04-16 @806  	u32 *hpmcp;
c70919bd9d0782a Sven Schnelle     2020-10-02  807  	u32 instr;
^1da177e4c3f415 Linus Torvalds    2005-04-16  808  
4182d0cdf853fb0 Helge Deller      2015-11-20  809  	if (strcmp((const char *)iva, "cows can fly"))
4182d0cdf853fb0 Helge Deller      2015-11-20  810  		panic("IVT invalid");
^1da177e4c3f415 Linus Torvalds    2005-04-16  811  
^1da177e4c3f415 Linus Torvalds    2005-04-16  812  	ivap = (u32 *)iva;
^1da177e4c3f415 Linus Torvalds    2005-04-16  813  
^1da177e4c3f415 Linus Torvalds    2005-04-16  814  	for (i = 0; i < 8; i++)
^1da177e4c3f415 Linus Torvalds    2005-04-16  815  	    *ivap++ = 0;
^1da177e4c3f415 Linus Torvalds    2005-04-16  816  
8d771b143fe2e39 Helge Deller      2017-09-17  817  	/*
8d771b143fe2e39 Helge Deller      2017-09-17  818  	 * Use PDC_INSTR firmware function to get instruction that invokes
8d771b143fe2e39 Helge Deller      2017-09-17  819  	 * PDCE_CHECK in HPMC handler.  See programming note at page 1-31 of
8d771b143fe2e39 Helge Deller      2017-09-17  820  	 * the PA 1.1 Firmware Architecture document.
8d771b143fe2e39 Helge Deller      2017-09-17  821  	 */
8d771b143fe2e39 Helge Deller      2017-09-17  822  	if (pdc_instr(&instr) == PDC_OK)
8d771b143fe2e39 Helge Deller      2017-09-17  823  		ivap[0] = instr;
8d771b143fe2e39 Helge Deller      2017-09-17  824  
41dbee81c875300 Helge Deller      2018-04-18  825  	/*
41dbee81c875300 Helge Deller      2018-04-18  826  	 * Rules for the checksum of the HPMC handler:
41dbee81c875300 Helge Deller      2018-04-18  827  	 * 1. The IVA does not point to PDC/PDH space (ie: the OS has installed
41dbee81c875300 Helge Deller      2018-04-18  828  	 *    its own IVA).
41dbee81c875300 Helge Deller      2018-04-18  829  	 * 2. The word at IVA + 32 is nonzero.
41dbee81c875300 Helge Deller      2018-04-18  830  	 * 3. If Length (IVA + 60) is not zero, then Length (IVA + 60) and
41dbee81c875300 Helge Deller      2018-04-18  831  	 *    Address (IVA + 56) are word-aligned.
41dbee81c875300 Helge Deller      2018-04-18  832  	 * 4. The checksum of the 8 words starting at IVA + 32 plus the sum of
41dbee81c875300 Helge Deller      2018-04-18  833  	 *    the Length/4 words starting at Address is zero.
41dbee81c875300 Helge Deller      2018-04-18  834  	 */
41dbee81c875300 Helge Deller      2018-04-18  835  
1138b6718ff74d2 John David Anglin 2018-10-06  836  	/* Setup IVA and compute checksum for HPMC handler */
1138b6718ff74d2 John David Anglin 2018-10-06  837  	ivap[6] = (u32)__pa(os_hpmc);
^1da177e4c3f415 Linus Torvalds    2005-04-16  838  
^1da177e4c3f415 Linus Torvalds    2005-04-16  839  	hpmcp = (u32 *)os_hpmc;
^1da177e4c3f415 Linus Torvalds    2005-04-16  840  
^1da177e4c3f415 Linus Torvalds    2005-04-16  841  	for (i=0; i<8; i++)
^1da177e4c3f415 Linus Torvalds    2005-04-16  842  	    check += ivap[i];
^1da177e4c3f415 Linus Torvalds    2005-04-16  843  
^1da177e4c3f415 Linus Torvalds    2005-04-16  844  	ivap[5] = -check;
c70919bd9d0782a Sven Schnelle     2020-10-02  845  	pr_debug("initialize_ivt: IVA[6] = 0x%08x\n", ivap[6]);
^1da177e4c3f415 Linus Torvalds    2005-04-16  846  }
^1da177e4c3f415 Linus Torvalds    2005-04-16  847  	
4182d0cdf853fb0 Helge Deller      2015-11-20  848  

:::::: The code at line 806 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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