I have a driver which I have ported from 2.6.18 kernel to 3.8 kernel. Now the driver has become unstable when I ported it to 3.8 kernel. Since lot of things have changed from 2.6.18 to 3.8 and I have taken a lot of care to replace the old kernel APIs with the newer ones but then too there have been certain things I haven't been able to replace and dcache_lock is one of them. Due to the absence of dcache_lock, I have not been able to properly lock stuff and writing/reading data that are being changed that maybe one of the reasons for instability. I specifically list down the link to my kernel driver below where I haven't been able to do the same, below- https://github.com/HeisSpiter/hepunion/blob/master/fs/hepunion/helpers.c#L37... If someone can suggest an alternative, I shall be grateful. Regards, Saket Sinha