[Xen-devel] atomic counters larger than 24 bits?

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

In tmem, I have some counters that I need to keep coherent,
preferably without a lock, so I'm using atomic_inc/dec etc.
However the comments in include/asm-x86/atomic.h say repeatedly
that the "useful range of an atomic_t is only 24 bits".

First, are the comments true in the xen implementation?
(I don't see any code that restricts them to anything less
than "int".)  If they ARE limited to 24 bits, what's the
recommended approach for larger atomic operations... or
do I just need to always use a lock?

Thanks,
Dan

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