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

Russell King - ARM Linux
2009-12-21T20:12:33Z

On Mon, Dec 21, 2009 at 11:30:43AM -0800, Richard Henderson wrote:
> On 12/17/2009 10:17 AM, Russell King - ARM Linux wrote:
>> How is "size-optimal trap" defined?
>
> E.g. Sparc and MIPS have "tcc" instructions that trap based on the
> condition codes, and so we eliminate the branch. That's the only
> optimization we apply with __builtin_trap.
>
>> Let me put it another way: I want this function to terminate with an
>> explicit NULL pointer dereference in every case.
>
> Then just use that.

That's precisely what we have been using for many years.