[sashal-linux-stable:queue-4.19 37/242] drivers/mtd/ubi/wl.c:314:27: warning: variable 'prev_e' set but not used

[sashal-linux-stable:queue-4.19 37/242] drivers/mtd/ubi/wl.c:314:27: warning: variable 'prev_e' set but not used

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.19
head:   76372ca86ebe9f76848cc20dee55115508601a3a
commit: 6011fc2046d06ca9bf7e5935a13491ac4f57120d [37/242] ubi: Fix producing anchor PEBs
config: arc-randconfig-r002-20200929 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
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/sashal/linux-stable.git/commit/?id=6011fc2046d06ca9bf7e5935a13491ac4f57120d
        git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git
        git fetch --no-tags sashal-linux-stable queue-4.19
        git checkout 6011fc2046d06ca9bf7e5935a13491ac4f57120d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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 >>):

   drivers/mtd/ubi/wl.c: In function 'find_wl_entry':
>> drivers/mtd/ubi/wl.c:314:27: warning: variable 'prev_e' set but not used [-Wunused-but-set-variable]
     314 |  struct ubi_wl_entry *e, *prev_e = NULL;
         |                           ^~~~~~
   drivers/mtd/ubi/wl.c:577: warning: Function parameter or member 'nested' not described in 'schedule_erase'
   drivers/mtd/ubi/wl.c:1055: warning: Excess function parameter 'shutdown' description in '__erase_worker'

vim +/prev_e +314 drivers/mtd/ubi/wl.c

801c135ce73d5d Artem B. Bityutskiy 2006-06-27  300  
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  301  /**
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  302   * find_wl_entry - find wear-leveling entry closest to certain erase counter.
8199b901a31b6e Richard Weinberger  2012-09-26  303   * @ubi: UBI device description object
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  304   * @root: the RB-tree where to look for
add8287e3fa216 Artem Bityutskiy    2012-03-07  305   * @diff: maximum possible difference from the smallest erase counter
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  306   *
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  307   * This function looks for a wear leveling entry with erase counter closest to
add8287e3fa216 Artem Bityutskiy    2012-03-07  308   * min + @diff, where min is the smallest erase counter.
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  309   */
8199b901a31b6e Richard Weinberger  2012-09-26  310  static struct ubi_wl_entry *find_wl_entry(struct ubi_device *ubi,
8199b901a31b6e Richard Weinberger  2012-09-26  311  					  struct rb_root *root, int diff)
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  312  {
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  313  	struct rb_node *p;
8199b901a31b6e Richard Weinberger  2012-09-26 @314  	struct ubi_wl_entry *e, *prev_e = NULL;
add8287e3fa216 Artem Bityutskiy    2012-03-07  315  	int max;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  316  
23553b2c08c9b6 Xiaochuan-Xu        2008-12-09  317  	e = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb);
add8287e3fa216 Artem Bityutskiy    2012-03-07  318  	max = e->ec + diff;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  319  
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  320  	p = root->rb_node;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  321  	while (p) {
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  322  		struct ubi_wl_entry *e1;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  323  
23553b2c08c9b6 Xiaochuan-Xu        2008-12-09  324  		e1 = rb_entry(p, struct ubi_wl_entry, u.rb);
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  325  		if (e1->ec >= max)
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  326  			p = p->rb_left;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  327  		else {
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  328  			p = p->rb_right;
8199b901a31b6e Richard Weinberger  2012-09-26  329  			prev_e = e;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  330  			e = e1;
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  331  		}
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  332  	}
801c135ce73d5d Artem B. Bityutskiy 2006-06-27  333  
8199b901a31b6e Richard Weinberger  2012-09-26  334  	return e;
8199b901a31b6e Richard Weinberger  2012-09-26  335  }
8199b901a31b6e Richard Weinberger  2012-09-26  336  

:::::: The code at line 314 was first introduced by commit
:::::: 8199b901a31b6e89b63842643f644fc05b403b20 UBI: Add fastmap support to the WL sub-system

:::::: TO: Richard Weinberger <richard@nod.at>
:::::: CC: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

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

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