[kbuild] drivers/scsi/ufs/ufs-mediatek.c:530:17: sparse: sparse: dubious: x & !y

[Dan Carpenter <dan.carpenter@oracle.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master
head:   29c395c77a9a514c5857c45ceae2665e9bd99ac7
commit: 488edafb1120f715bebd80b6fe4089f83fb082b2 scsi: ufs-mediatek: Introduce low-power mode for device power supply
config: arm64-randconfig-s031-20210225 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross  -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-229-g60c1f270-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=488edafb1120f715bebd80b6fe4089f83fb082b2 
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
        git fetch --no-tags linus master
        git checkout 488edafb1120f715bebd80b6fe4089f83fb082b2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 

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

"sparse warnings: (new ones prefixed by >>)"
   drivers/scsi/ufs/ufs-mediatek.c:182:5: sparse: sparse: symbol 'ufs_mtk_wait_link_state' was not declared. Should it be static?
>> drivers/scsi/ufs/ufs-mediatek.c:530:17: sparse: sparse: dubious: x & !y

vim +530 drivers/scsi/ufs/ufs-mediatek.c

488edafb1120f7 Stanley Chu 2020-06-01  525  static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
488edafb1120f7 Stanley Chu 2020-06-01  526  {
488edafb1120f7 Stanley Chu 2020-06-01  527  	if (!hba->vreg_info.vccq2)
488edafb1120f7 Stanley Chu 2020-06-01  528  		return;
488edafb1120f7 Stanley Chu 2020-06-01  529  
488edafb1120f7 Stanley Chu 2020-06-01 @530  	if (lpm & !hba->vreg_info.vcc->enabled)

This works because both sides are bool, but why not just use &&?

488edafb1120f7 Stanley Chu 2020-06-01  531  		regulator_set_mode(hba->vreg_info.vccq2->reg,
488edafb1120f7 Stanley Chu 2020-06-01  532  				   REGULATOR_MODE_IDLE);
488edafb1120f7 Stanley Chu 2020-06-01  533  	else if (!lpm)
488edafb1120f7 Stanley Chu 2020-06-01  534  		regulator_set_mode(hba->vreg_info.vccq2->reg,
488edafb1120f7 Stanley Chu 2020-06-01  535  				   REGULATOR_MODE_NORMAL);
488edafb1120f7 Stanley Chu 2020-06-01  536  }

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

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