[ltt-dev] [PATCH RFC] Force build failure on unknown architectures

[pbonzini@redhat.com (Paolo Bonzini)]

On 06/16/2010 02:12 AM, Paul E. McKenney wrote:
> On Wed, Jun 16, 2010 at 01:55:13AM +0200, Paolo Bonzini wrote:
>> On 06/16/2010 01:14 AM, Paul E. McKenney wrote:
>>> Create urcu/arch_unknown.h and urcu/uatomic_arch_unknown.h, which
>>> contain only #error statements and explanatory comments.  This forces
>>> build failures on unrecognized architectures in preference to trying
>>> to guess at what operations might be safe on such architectures.
>>>
>>> One other semi-feasible alternative is to use hashed arrays of locks
>>> that are acquired with signals disabled.  However, this seems a bit
>>> too ornate, especially for architectures for which the gcc __sync_
>>> primitives work correctly.
>>
>> ia64 is one.
>
> Does ia64 work with the current code?  (My guess is "no" -- I believe
> that you would get build errors.  But I have been surprised before!)

I don't know. :)

> If my guess is correct, my thought would be to create urcu/arch_gcc.h
> and urcu/uatomic_arch_gcc.h files with the appropriate definitions
> based on __sync_ primitives.  If you can test on IA64, I would also
> be happy to add support for it based on these new files.

Sure, thanks!

Paolo