Further digging led me to the following entry in the ChangeLog file in libatomic_ops-7.2alpha4[1]:
[1] from http://www.hpl.hp.com/research/linux/atomic_ops/download.php4
2009-09-01 Hans Boehm <[email protected]> (Really mostly Patrick
Marlier)
* src/atomic_ops/sysdeps/gcc/sparc.h (AO_test_and_set_full): Use
AO_TS_VAL_t for "oldval" (for 64-bit support).
The change shows that no casting is needed, just using the right type.
HTH
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