On 2019/2/14 15:26, Christoph Hellwig wrote: > On Thu, Feb 14, 2019 at 01:41:47AM +0000, YueHaibing wrote: >> There is no need to have the 'struct dentry *d_swiotlb_usage' variable >> static since new value always be assigned before use it. > > FYI, this is in swiotlb_create_debugfs, not swiotlb_dma_supported. Thank you, I will fix it. > > . >