gcc-4.6.0 generates no code for sub_preempt_count()

[Richard Weinberger]

Hi,

I'm facing a very strange issue with gcc-4.6.0 and UML.
Within __local_bh_enable() gcc generates no code for sub_preempt_count().

See:
http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc460.txt
vs.
http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc431.txt

Interestingly it generates code for add_preempt_count().
I can reproduce this on x86 and x86_64.

The problem has to do with UML's current_thread_info() function.
When I replace it with arch/x86's (unportable) variant gcc generates code.

Any ideas whether this is a gcc or a kernel issue?
Thanks,
//richard
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