Re: [PATCH v2 5/5] vduse: Support registering userspace memory for IOTLB

[kernel test robot <lkp@xxxxxxxxx>]

Hi Xie,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.19-rc5 next-20220705]
[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/Xie-Yongji/VDUSE-Support-registering-userspace-memory-as-bounce-buffer/20220706-130802
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e35e5b6f695d241ffb1d223207da58a1fbcdff4b
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20220706/202207061418.mTlO0yqK-lkp@xxxxxxxxx/config)
compiler: alpha-linux-gcc (GCC) 11.3.0
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/intel-lab-lkp/linux/commit/9be699264e4fede9c3be913b2d1003c260d9fa05
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Xie-Yongji/VDUSE-Support-registering-userspace-memory-as-bounce-buffer/20220706-130802
        git checkout 9be699264e4fede9c3be913b2d1003c260d9fa05
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash drivers/vdpa/

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

All warnings (new ones prefixed by >>):

   drivers/vdpa/vdpa_user/vduse_dev.c: In function 'vduse_dev_dereg_iotlb_mem':
   drivers/vdpa/vdpa_user/vduse_dev.c:949:9: error: implicit declaration of function 'vfree'; did you mean 'kvfree'? [-Werror=implicit-function-declaration]
     949 |         vfree(dev->iotlb_mem->pages);
         |         ^~~~~
         |         kvfree
   drivers/vdpa/vdpa_user/vduse_dev.c: In function 'vduse_dev_reg_iotlb_mem':
   drivers/vdpa/vdpa_user/vduse_dev.c:978:21: error: implicit declaration of function '__vmalloc'; did you mean '__kmalloc'? [-Werror=implicit-function-declaration]
     978 |         page_list = __vmalloc(array_size(npages, sizeof(struct page *)),
         |                     ^~~~~~~~~
         |                     __kmalloc
>> drivers/vdpa/vdpa_user/vduse_dev.c:978:19: warning: assignment to 'struct page **' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     978 |         page_list = __vmalloc(array_size(npages, sizeof(struct page *)),
         |                   ^
   cc1: some warnings being treated as errors


vim +978 drivers/vdpa/vdpa_user/vduse_dev.c

   957	
   958	static int vduse_dev_reg_iotlb_mem(struct vduse_dev *dev,
   959					   u64 iova, u64 uaddr, u64 size)
   960	{
   961		struct page **page_list = NULL;
   962		struct vduse_iotlb_mem *mem = NULL;
   963		long pinned = 0;
   964		unsigned long npages, lock_limit;
   965		int ret;
   966	
   967		if (size != dev->domain->bounce_size ||
   968		    iova != 0 || uaddr & ~PAGE_MASK)
   969			return -EINVAL;
   970	
   971		mutex_lock(&dev->mem_lock);
   972		ret = -EEXIST;
   973		if (dev->iotlb_mem)
   974			goto unlock;
   975	
   976		ret = -ENOMEM;
   977		npages = size >> PAGE_SHIFT;
 > 978		page_list = __vmalloc(array_size(npages, sizeof(struct page *)),
   979				      GFP_KERNEL_ACCOUNT);
   980		mem = kzalloc(sizeof(*mem), GFP_KERNEL);
   981		if (!page_list || !mem)
   982			goto unlock;
   983	
   984		mmap_read_lock(current->mm);
   985	
   986		lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));
   987		if (npages + atomic64_read(&current->mm->pinned_vm) > lock_limit)
   988			goto out;
   989	
   990		pinned = pin_user_pages(uaddr, npages, FOLL_LONGTERM | FOLL_WRITE,
   991					page_list, NULL);
   992		if (pinned != npages) {
   993			ret = pinned < 0 ? pinned : -ENOMEM;
   994			goto out;
   995		}
   996	
   997		ret = vduse_domain_add_user_bounce_pages(dev->domain,
   998							 page_list, pinned);
   999		if (ret)
  1000			goto out;
  1001	
  1002		atomic64_add(npages, &current->mm->pinned_vm);
  1003	
  1004		mem->pages = page_list;
  1005		mem->npages = pinned;
  1006		mem->iova = iova;
  1007		mem->mm = current->mm;
  1008		mmgrab(current->mm);
  1009	
  1010		dev->iotlb_mem = mem;
  1011	out:
  1012		if (ret && pinned > 0)
  1013			unpin_user_pages(page_list, pinned);
  1014	
  1015		mmap_read_unlock(current->mm);
  1016	unlock:
  1017		if (ret) {
  1018			vfree(page_list);
  1019			kfree(mem);
  1020		}
  1021		mutex_unlock(&dev->mem_lock);
  1022		return ret;
  1023	}
  1024	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp
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