linux-kernel - arch/ia64/include/asm/mmu_context.h:127:48: error: variable 'old

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Message-ID: <202206221623.Gi9Zz88b-lkp@intel.com>
Date:   Wed, 22 Jun 2022 16:25:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Haijun Liu <haijun.liu@...iatek.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>,
        Ricardo Martinez <ricardo.martinez@...ux.intel.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>
Subject: arch/ia64/include/asm/mmu_context.h:127:48: error: variable
 'old_rr4' set but not used

Hi Haijun,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ca1fdab7fd27eb069df1384b2850dcd0c2bebe8d
commit: 13e920d93e37fcaef4a9309515798a3cae9dcf19 net: wwan: t7xx: Add core components
date:   6 weeks ago
config: ia64-randconfig-r031-20220622 (https://download.01.org/0day-ci/archive/20220622/202206221623.Gi9Zz88b-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 11.3.0
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=13e920d93e37fcaef4a9309515798a3cae9dcf19
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 13e920d93e37fcaef4a9309515798a3cae9dcf19
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/net/wwan/t7xx/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:153,
                    from include/linux/pgtable.h:6,
                    from include/linux/mm.h:29,
                    from include/linux/scatterlist.h:8,
                    from include/linux/dma-mapping.h:10,
                    from drivers/net/wwan/t7xx/t7xx_pci.c:22:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
>> arch/ia64/include/asm/mmu_context.h:127:48: error: variable 'old_rr4' set but not used [-Werror=unused-but-set-variable]
     127 |         unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                                ^~~~~~~
   cc1: all warnings being treated as errors


vim +/old_rr4 +127 arch/ia64/include/asm/mmu_context.h

^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  121  
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  122  static inline void
badea125d7cbd9 include/asm-ia64/mmu_context.h David Mosberger-Tang 2005-07-25  123  reload_context (nv_mm_context_t context)
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  124  {
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  125  	unsigned long rid;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  126  	unsigned long rid_incr = 0;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16 @127  	unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  128  
0a41e250116058 include/asm-ia64/mmu_context.h Peter Chubb          2005-08-16  129  	old_rr4 = ia64_get_rr(RGN_BASE(RGN_HPAGE));
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  130  	rid = context << 3;	/* make space for encoding the region number */
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  131  	rid_incr = 1 << 8;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  132  
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  133  	/* encode the region id, preferred page size, and VHPT enable bit: */
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  134  	rr0 = (rid << 8) | (PAGE_SHIFT << 2) | 1;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  135  	rr1 = rr0 + 1*rid_incr;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  136  	rr2 = rr0 + 2*rid_incr;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  137  	rr3 = rr0 + 3*rid_incr;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  138  	rr4 = rr0 + 4*rid_incr;
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  139  #ifdef  CONFIG_HUGETLB_PAGE
^1da177e4c3f41 include/asm-ia64/mmu_context.h Linus Torvalds       2005-04-16  140  	rr4 = (rr4 & (~(0xfcUL))) | (old_rr4 & 0xfc);
0a41e250116058 include/asm-ia64/mmu_context.h Peter Chubb          2005-08-16  141  

:::::: The code at line 127 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

-- 
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