I modified my module (m.c). Still sending buffer from user space using ioctl, but instead of copying data from buffer provided by user, I have allocated (kmalloc) a buffer and I copy from this buffer to another kernel buffer which is allocated each time this module ioclt is invoked.
copy_from_user is now replaced with memcpy. I still see processor stall. This means the buffer allocated per call is the cause. Abu
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