Re: [PATCH v2 2/2] mtd: mtdoops: Create a header structure for the saved mtdoops.

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

Hi Jean-Marc,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mtd/mtd/next]
[also build test WARNING on mtd/mtd/fixes linux/master linus/master v5.17 next-20220330]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Jean-Marc-Eurin/mtd-mtdoops-Structure-the-header-of-the-dumped-oops/20220331-023808
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next
config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20220331/202203310819.kOiVSg8W-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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/0d39801219fd826554caf69402424346799810d5
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jean-Marc-Eurin/mtd-mtdoops-Structure-the-header-of-the-dumped-oops/20220331-023808
        git checkout 0d39801219fd826554caf69402424346799810d5
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/mtd/

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/mtdoops.c:244:39: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
                                  page * record_size, retlen, sizeof(hdr), ret);
                                                              ^~~~~~~~~~~
   include/linux/printk.h:446:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   1 warning generated.


vim +244 drivers/mtd/mtdoops.c

   225	
   226	static void find_next_position(struct mtdoops_context *cxt)
   227	{
   228		struct mtd_info *mtd = cxt->mtd;
   229		struct mtdoops_hdr hdr;
   230		int ret, page, maxpos = 0;
   231		u32 maxcount = 0xffffffff;
   232		size_t retlen;
   233	
   234		for (page = 0; page < cxt->oops_pages; page++) {
   235			if (mtd_block_isbad(mtd, page * record_size))
   236				continue;
   237			/* Assume the page is used */
   238			mark_page_used(cxt, page);
   239			ret = mtd_read(mtd, page * record_size, sizeof(hdr),
   240				       &retlen, (u_char *)&hdr);
   241			if (retlen != sizeof(hdr) ||
   242					(ret < 0 && !mtd_is_bitflip(ret))) {
   243				printk(KERN_ERR "mtdoops: read failure at %ld (%td of %d read), err %d\n",
 > 244				       page * record_size, retlen, sizeof(hdr), ret);
   245				continue;
   246			}
   247	
   248			if (hdr.seq == 0xffffffff && hdr.magic == 0xffffffff)
   249				mark_page_unused(cxt, page);
   250			if (hdr.seq == 0xffffffff || hdr.magic != MTDOOPS_KERNMSG_MAGIC)
   251				continue;
   252			if (maxcount == 0xffffffff) {
   253				maxcount = hdr.seq;
   254				maxpos = page;
   255			} else if (hdr.seq < 0x40000000 && maxcount > 0xc0000000) {
   256				maxcount = hdr.seq;
   257				maxpos = page;
   258			} else if (hdr.seq > maxcount && hdr.seq < 0xc0000000) {
   259				maxcount = hdr.seq;
   260				maxpos = page;
   261			} else if (hdr.seq > maxcount && hdr.seq > 0xc0000000
   262						&& maxcount > 0x80000000) {
   263				maxcount = hdr.seq;
   264				maxpos = page;
   265			}
   266		}
   267		if (maxcount == 0xffffffff) {
   268			cxt->nextpage = cxt->oops_pages - 1;
   269			cxt->nextcount = 0;
   270		}
   271		else {
   272			cxt->nextpage = maxpos;
   273			cxt->nextcount = maxcount;
   274		}
   275	
   276		mtdoops_inc_counter(cxt);
   277	}
   278	

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