linux-kernel - Re: [PATCH] uacce: Tidy up locking

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Date:   Tue, 21 Jun 2022 04:18:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>
Cc:     kbuild-all@...ts.01.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Wangzhou <wangzhou1@...ilicon.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-accelerators@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Yang Shen <shenyang39@...wei.com>
Subject: Re: [PATCH] uacce: Tidy up locking

Hi Jean-Philippe,

I love your patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on soc/for-next linus/master v5.19-rc2 next-20220617]
[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-Philippe-Brucker/uacce-Tidy-up-locking/20220620-220634
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 0a35780c755ccec097d15c6b4ff8b246a89f1689
config: i386-randconfig-s001 (https://download.01.org/0day-ci/archive/20220621/202206210432.WVkOxVu5-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-30-g92122700-dirty
        # https://github.com/intel-lab-lkp/linux/commit/3589b5391f54bea3dc85ed65fe0f036757a4f21c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jean-Philippe-Brucker/uacce-Tidy-up-locking/20220620-220634
        git checkout 3589b5391f54bea3dc85ed65fe0f036757a4f21c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/misc/uacce/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/misc/uacce/uacce.c:291:21: sparse: sparse: incorrect type in assignment (different base types) @@     expected int ret @@     got restricted __poll_t @@
   drivers/misc/uacce/uacce.c:291:21: sparse:     expected int ret
   drivers/misc/uacce/uacce.c:291:21: sparse:     got restricted __poll_t
>> drivers/misc/uacce/uacce.c:295:16: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __poll_t @@     got int ret @@
   drivers/misc/uacce/uacce.c:295:16: sparse:     expected restricted __poll_t
   drivers/misc/uacce/uacce.c:295:16: sparse:     got int ret

vim +291 drivers/misc/uacce/uacce.c

   277	
   278	static __poll_t uacce_fops_poll(struct file *file, poll_table *wait)
   279	{
   280		struct uacce_queue *q = file->private_data;
   281		struct uacce_device *uacce = q->uacce;
   282		int ret = 0;
   283	
   284		poll_wait(file, &q->wait, wait);
   285	
   286		mutex_lock(&q->mutex);
   287		if (!uacce_queue_is_valid(q))
   288			goto out_unlock;
   289	
   290		if (uacce->ops->is_q_updated && uacce->ops->is_q_updated(q))
 > 291			ret = EPOLLIN | EPOLLRDNORM;
   292	
   293	out_unlock:
   294		mutex_unlock(&q->mutex);
 > 295		return ret;
   296	}
   297	

-- 
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