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Message-ID: <202205101914.ZJmSORCV-lkp@intel.com>
Date: Tue, 10 May 2022 19:50:29 +0800
From: kernel test robot <lkp@...el.com>
To: Guixin Liu <kanie@...ux.alibaba.com>, gregkh@...uxfoundation.org
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uio: Replace mutex info_lock with percpu_ref
Hi Guixin,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on linux/master linus/master v5.18-rc6]
[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/Guixin-Liu/uio-Replace-mutex-info_lock-with-percpu_ref/20220510-135202
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 33a1c6618677fe33f8e84cb7bedc45abbce89a50
config: s390-randconfig-s031-20220509 (https://download.01.org/0day-ci/archive/20220510/202205101914.ZJmSORCV-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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: v0.6.4-dirty
# https://github.com/intel-lab-lkp/linux/commit/4d3e70c70de7bcf57d176790db79b8cbee990171
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Guixin-Liu/uio-Replace-mutex-info_lock-with-percpu_ref/20220510-135202
git checkout 4d3e70c70de7bcf57d176790db79b8cbee990171
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
>> drivers/uio/uio.c:564:24: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got int @@
drivers/uio/uio.c:564:24: sparse: expected restricted __poll_t
drivers/uio/uio.c:564:24: sparse: got int
drivers/uio/uio.c:567:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __poll_t [usertype] ret @@ got int @@
drivers/uio/uio.c:567:21: sparse: expected restricted __poll_t [usertype] ret
drivers/uio/uio.c:567:21: sparse: got int
vim +564 drivers/uio/uio.c
556
557 static __poll_t uio_poll(struct file *filep, poll_table *wait)
558 {
559 struct uio_listener *listener = filep->private_data;
560 struct uio_device *idev = listener->dev;
561 __poll_t ret = 0;
562
563 if (!percpu_ref_tryget_live(&idev->info_ref))
> 564 return -EIO;
565
566 if (!idev->info || !idev->info->irq)
567 ret = -EIO;
568 percpu_ref_put(&idev->info_ref);
569
570 if (ret)
571 return ret;
572
573 poll_wait(filep, &idev->wait, wait);
574 if (listener->event_count != atomic_read(&idev->event))
575 return EPOLLIN | EPOLLRDNORM;
576 return 0;
577 }
578
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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