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Alex Rivera
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I was hoping someone could explain the nuances of the __user macro used in the linux kernel source. First of all, the macro: # define __user __attribute__((noderef, address_space(1))) Now, after some googling I read that this macro allows one to designate a pointer as belonging to the user address space, and that it should not be dereferenced. I may be missing some obvious facts, but could someone please explain the implications of such a macro? For instance, what is a good example of where this macro would be of use? Again, forgive me if I am missing something obvious. To put this in some context, I came accross the macro while examining some USB code (linux/usbdevice_fs.h). I am only looking for a general understanding of this macros( or others like it) use within the kernel. Thanks for looking!
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