linux-kernel - drivers/gpu/drm/nouveau/nouveau_bo.c:1314:24: warning: variable 'dev' set but not used

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Date:   Mon, 27 Sep 2021 23:28:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christian König <christian.koenig@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dave Airlie <airlied@...hat.com>,
        Madhav Chauhan <madhav.chauhan@....com>
Subject: drivers/gpu/drm/nouveau/nouveau_bo.c:1314:24: warning: variable
 'dev' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92477dd1faa650e50bd3bb35a6c0b8d09198cc35
commit: 461619f5c3242aaee9ec3f0b7072719bd86ea207 drm/nouveau: switch to new allocator
date:   11 months ago
config: m68k-randconfig-r021-20210927 (attached as .config)
compiler: m68k-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=461619f5c3242aaee9ec3f0b7072719bd86ea207
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 461619f5c3242aaee9ec3f0b7072719bd86ea207
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k 

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

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/nouveau/nouveau_bo.c: In function 'nouveau_ttm_tt_populate':
>> drivers/gpu/drm/nouveau/nouveau_bo.c:1314:24: warning: variable 'dev' set but not used [-Wunused-but-set-variable]
    1314 |         struct device *dev;
         |                        ^~~
   drivers/gpu/drm/nouveau/nouveau_bo.c: In function 'nouveau_ttm_tt_unpopulate':
   drivers/gpu/drm/nouveau/nouveau_bo.c:1338:24: warning: variable 'dev' set but not used [-Wunused-but-set-variable]
    1338 |         struct device *dev;
         |                        ^~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for NEED_MULTIPLE_NODES
   Depends on DISCONTIGMEM || NUMA
   Selected by
   - SINGLE_MEMORY_CHUNK && MMU


vim +/dev +1314 drivers/gpu/drm/nouveau/nouveau_bo.c

e1429b4c3c7951 Ben Skeggs            2010-09-10  1307  
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1308  static int
0a667b500703db Dave Airlie           2020-08-25  1309  nouveau_ttm_tt_populate(struct ttm_bo_device *bdev,
0a667b500703db Dave Airlie           2020-08-25  1310  			struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1311  {
e34b8feeaa4b65 Christian König       2020-10-21  1312  	struct ttm_tt *ttm_dma = (void *)ttm;
ebb945a94bba2c Ben Skeggs            2012-07-20  1313  	struct nouveau_drm *drm;
359088d5b8ec06 Ben Skeggs            2017-11-01 @1314  	struct device *dev;
22b33e8ed0e38b Dave Airlie           2012-04-02  1315  	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1316  
7eec915138279d Dave Airlie           2020-09-15  1317  	if (ttm_tt_is_populated(ttm))
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1318  		return 0;
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1319  
22b33e8ed0e38b Dave Airlie           2012-04-02  1320  	if (slave && ttm->sg) {
22b33e8ed0e38b Dave Airlie           2012-04-02  1321  		/* make userspace faulting work */
22b33e8ed0e38b Dave Airlie           2012-04-02  1322  		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
22b33e8ed0e38b Dave Airlie           2012-04-02  1323  						 ttm_dma->dma_address, ttm->num_pages);
22b33e8ed0e38b Dave Airlie           2012-04-02  1324  		return 0;
22b33e8ed0e38b Dave Airlie           2012-04-02  1325  	}
22b33e8ed0e38b Dave Airlie           2012-04-02  1326  
0a667b500703db Dave Airlie           2020-08-25  1327  	drm = nouveau_bdev(bdev);
359088d5b8ec06 Ben Skeggs            2017-11-01  1328  	dev = drm->dev->dev;
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1329  
461619f5c3242a Christian König       2020-10-24  1330  	return ttm_pool_alloc(&drm->ttm.bdev.pool, ttm, ctx);
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1331  }
3230cfc34fca9d Konrad Rzeszutek Wilk 2011-10-17  1332  

:::::: The code at line 1314 was first introduced by commit
:::::: 359088d5b8ec06196a9ea53e7e59167514220465 drm/nouveau: remove trivial cases of nvxx_device() usage

:::::: TO: Ben Skeggs <bskeggs@...hat.com>
:::::: CC: Ben Skeggs <bskeggs@...hat.com>

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

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