Re: [PATCH] ARM: Convert BUG() to use unreachable()

[Russell King - ARM Linux]

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.
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