On Thu, Dec 17, 2009 at 11:14:01AM -0800, Joe Buck wrote: > On Thu, Dec 17, 2009 at 11:06:13AM -0800, Russell King - ARM Linux wrote: > > On Thu, Dec 17, 2009 at 10:35:17AM -0800, Joe Buck wrote: > > > Besides, didn't I see a whole bunch of kernel security patches related > > > to null pointer dereferences lately? If page 0 can be mapped, you > > > suddenly won't get your trap. > > > > Page 0 can not be mapped on ARM kernels since the late 1990s, and this > > protection is independent of the generic kernel. > > > > Milage may vary on other architectures, but that's not a concern here. > > I don't understand, though, why you would want to implement a generally > useful facility (make the kernel trap so you can do a post-mortem > analysis) in a way that's only safe for the ARM port.
The discussion at hand is about code contained in the ARM supporting files (arch/arm/kernel/traps.c), rather than the generic kernel. As such, it is not relevant to any architecture other than ARM.
