[Linux][Driver]Fix for the error : struct i2c_device_id is not terminated with a NULL entry!

check struct i2c_device_id  initialization. Missing of empty curly braces causes the error . eg:  if struct i2c_device_id initialization is like given below , compiler will show the above error . ie “struct i2c_device_id is not terminated with a NULL entry! ” const struct i2c_device_id adt7461_id[] = { { DRIVER_NAME, 0 }, }; Fix for the above

[Linux]How to test given memory address is “kernelness” ?

is_kernel_addr function will check whether a memory is inside the kernel or not

[Linux]How to find device’s offset in linux ?

subtract KERNELBASE from the device’s kernel address

[Linux]How determine a physical address from a virtual address ?

  There are two ways to determine a physical address from a virtual one:  va = pa + PAGE_OFFSET – MEMORY_START  va = pa + KERNELBASE – PHYSICAL_START 

[Linux][Memory Mapping]Linear mapping equation among Kernel base , page offset, physical start and memory start

For the linear mapping the following equation should be true: KERNELBASE – PAGE_OFFSET = PHYSICAL_START – MEMORY_START Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START where KERNELBASE ->the virtual address of the start of the kernel PAGE_OFFSET->the virtual address of the start of lowmem PHYSICAL_START-> the physical address of the start of the kernel MEMORY_START