Re: [PATCH v3 3/3] NFS: Convert buffered read paths to use netfs when fscache is enabled

[kernel test robot <lkp@intel.com>]

Hi Dave,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v6.0-rc3]
[also build test WARNING on linus/master next-20220830]
[cannot apply to trondmy-nfs/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dave-Wysochanski/Convert-NFS-with-fscache-to-the-netfs-API/20220831-085217
base:    b90cb1053190353cc30f0fef0ef1f378ccc063c5
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20220831/202208311054.eXBCcm1y-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/5ac59d0573d1008c9d8856a91e4b4fd2ee61bb63
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Dave-Wysochanski/Convert-NFS-with-fscache-to-the-netfs-API/20220831-085217
        git checkout 5ac59d0573d1008c9d8856a91e4b4fd2ee61bb63
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash fs/

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

All warnings (new ones prefixed by >>):

   fs/nfs/fscache.c: In function 'nfs_netfs_read_initiate':
>> fs/nfs/fscache.c:331:42: warning: variable 'sreq' set but not used [-Wunused-but-set-variable]
     331 |         struct netfs_io_subrequest      *sreq;
         |                                          ^~~~
   fs/nfs/fscache.c: In function 'nfs_netfs_read_done':
   fs/nfs/fscache.c:346:42: warning: variable 'sreq' set but not used [-Wunused-but-set-variable]
     346 |         struct netfs_io_subrequest      *sreq;
         |                                          ^~~~


vim +/sreq +331 fs/nfs/fscache.c

   327	
   328	void nfs_netfs_read_initiate(struct nfs_pgio_header *hdr)
   329	{
   330		struct nfs_netfs_io_data        *netfs = hdr->netfs;
 > 331		struct netfs_io_subrequest      *sreq;
   332	
   333		if (!netfs)
   334			return;
   335	
   336		sreq = netfs->sreq;
   337		spin_lock(&netfs->lock);
   338		atomic_inc(&netfs->rpcs);
   339		netfs->rpc_byte_count += hdr->args.count;
   340		spin_unlock(&netfs->lock);
   341	}
   342	

-- 
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https://01.org/lkp