Re: [Qemu-devel] [PATCH] Fix TLS support on x86

[Alexander Graf]

On Jun 21, 2007, at 7:31 AM, David Woodhouse wrote:

> On Wed, 2007-06-20 at 18:42 +0200, Alexander Graf wrote:
> > implements futexes (this is mostly done by David Woodhouse as well,
> > FUTEX_WAKE_OP done by me)
>
> #ifdef BSWAP_NEEDED, only FUTEX_OP_CMP_EQ and FUTEX_OP_CMP_NE will  
> work
> as expected. If we want to do the rest then we'll need to implement
> FUTEX_OP_CMP_LT_WRONGENDIAN &c in the kernel.

Tell me if I'm wrong there, but as far as I could tell from the  
documentation by Ulrich Drapper (http://people.redhat.com/drepper/ 
futex.pdf) and the kernel source, FUTEX_WAKE_OP can be easily  
expressed as two conditional FUTEX_WAKE calls.
Because the only real endianness problems that exist are in the  
conditional checking, we should be on the safe side if that is done  
in qemu (which is what I was implementing).

Alex