linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10 5860/5866] drivers/trusty/trusty-log.c:354:21: warning: left shift count >= width of type

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Date:   Thu, 27 Jan 2022 19:06:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Armelle Laine <armellel@...gle.com>
Cc:     kbuild-all@...ts.01.org, GNU/Weeb Mailing List <gwml@...weeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10
 5860/5866] drivers/trusty/trusty-log.c:354:21: warning: left shift count >=
 width of type

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-trusty-5.10
head:   52cdd137fae0b001197a51646289e3cbdda921d5
commit: bf9d994a65a2941d96b58769d79c256f7d8862c0 [5860/5866] ANDROID: trusty-log: Complement logging sink with unthrottled virtual file
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20220127/202201271930.7h18TAIk-lkp@intel.com/config)
compiler: arm-linux-gnueabi-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://github.com/ammarfaizi2/linux-block/commit/bf9d994a65a2941d96b58769d79c256f7d8862c0
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-trusty-5.10
        git checkout bf9d994a65a2941d96b58769d79c256f7d8862c0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

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/trusty/trusty-log.c: In function 'trusty_log_seq_next':
>> drivers/trusty/trusty-log.c:354:21: warning: left shift count >= width of type [-Wshift-count-overflow]
     354 |         *pos = (1UL << 32) + log_sfile_sink->get;
         |                     ^~


vim +354 drivers/trusty/trusty-log.c

   323	
   324	static void *trusty_log_seq_next(struct seq_file *sfile, void *v, loff_t *pos)
   325	{
   326		struct trusty_log_sfile *lb;
   327		struct trusty_log_state *s;
   328		struct trusty_log_sink_state *log_sfile_sink = v;
   329		int rc = 0;
   330	
   331		if (WARN_ON(!log_sfile_sink))
   332			return ERR_PTR(-EINVAL);
   333	
   334		lb = sfile->private;
   335		if (WARN_ON(!lb)) {
   336			rc = -EINVAL;
   337			goto end_of_iter;
   338		}
   339		s = container_of(lb, struct trusty_log_state, log_sfile);
   340	
   341		if (WARN_ON(!pos)) {
   342			rc = -EINVAL;
   343			goto end_of_iter;
   344		}
   345		/*
   346		 * When starting a virtual file sink, the start function is invoked
   347		 * with a pos argument which value is set to zero.
   348		 * Subsequent starts are invoked with pos being set to
   349		 * the unwrapped read index (get).
   350		 * Upon u32 wraparound, the get index could be reset to zero.
   351		 * Thus a msb is used to distinguish the `get` zero value
   352		 * from the `start of file` zero value.
   353		 */
 > 354		*pos = (1UL << 32) + log_sfile_sink->get;
   355		if (!trusty_log_has_data(s, log_sfile_sink))
   356			goto end_of_iter;
   357	
   358		return log_sfile_sink;
   359	
   360	end_of_iter:
   361		pr_debug("%s kfree\n", __func__);
   362		kfree(log_sfile_sink);
   363		return rc < 0 ? ERR_PTR(rc) : NULL;
   364	}
   365	

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