linux-kernel - Re: [PATCH] firmware_loader: Replace kmap() with kmap_local

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Date:   Sun, 10 Jul 2022 19:43:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Russ Weight <russell.h.weight@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Nick Terrell <terrelln@...com>, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH] firmware_loader: Replace kmap() with kmap_local_page()

Hi "Fabio,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on linus/master v5.19-rc5 next-20220708]
[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/Fabio-M-De-Francesco/firmware_loader-Replace-kmap-with-kmap_local_page/20220710-181336
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 2c8f7ef4b3c4ac67a876b2a9fe7b6a1128265104
config: x86_64-allyesconfig
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/8b8434c9157ae5b8db5ff5a623c4f95d978097f7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Fabio-M-De-Francesco/firmware_loader-Replace-kmap-with-kmap_local_page/20220710-181336
        git checkout 8b8434c9157ae5b8db5ff5a623c4f95d978097f7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/base/firmware_loader/

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

All warnings (new ones prefixed by >>):

   drivers/base/firmware_loader/sysfs.c: In function 'firmware_rw':
>> drivers/base/firmware_loader/sysfs.c:245:23: warning: unused variable 'page_data' [-Wunused-variable]
     245 |                 void *page_data;
         |                       ^~~~~~~~~


vim +/page_data +245 drivers/base/firmware_loader/sysfs.c

e0c11a8b985137 Russ Weight           2022-04-21  240  
e0c11a8b985137 Russ Weight           2022-04-21  241  static void firmware_rw(struct fw_priv *fw_priv, char *buffer,
e0c11a8b985137 Russ Weight           2022-04-21  242  			loff_t offset, size_t count, bool read)
e0c11a8b985137 Russ Weight           2022-04-21  243  {
e0c11a8b985137 Russ Weight           2022-04-21  244  	while (count) {
e0c11a8b985137 Russ Weight           2022-04-21 @245  		void *page_data;
e0c11a8b985137 Russ Weight           2022-04-21  246  		int page_nr = offset >> PAGE_SHIFT;
e0c11a8b985137 Russ Weight           2022-04-21  247  		int page_ofs = offset & (PAGE_SIZE - 1);
e0c11a8b985137 Russ Weight           2022-04-21  248  		int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
e0c11a8b985137 Russ Weight           2022-04-21  249  
e0c11a8b985137 Russ Weight           2022-04-21  250  		if (read)
8b8434c9157ae5 Fabio M. De Francesco 2022-07-10  251  			memcpy_from_page(buffer, fw_priv->pages[page_nr],
8b8434c9157ae5 Fabio M. De Francesco 2022-07-10  252  					 page_ofs, page_cnt);
e0c11a8b985137 Russ Weight           2022-04-21  253  		else
8b8434c9157ae5 Fabio M. De Francesco 2022-07-10  254  			memcpy_to_page(fw_priv->pages[page_nr], page_ofs,
8b8434c9157ae5 Fabio M. De Francesco 2022-07-10  255  				       buffer, page_cnt);
e0c11a8b985137 Russ Weight           2022-04-21  256  
e0c11a8b985137 Russ Weight           2022-04-21  257  		buffer += page_cnt;
e0c11a8b985137 Russ Weight           2022-04-21  258  		offset += page_cnt;
e0c11a8b985137 Russ Weight           2022-04-21  259  		count -= page_cnt;
e0c11a8b985137 Russ Weight           2022-04-21  260  	}
e0c11a8b985137 Russ Weight           2022-04-21  261  }
e0c11a8b985137 Russ Weight           2022-04-21  262  

-- 
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https://01.org/lkp

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