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Fix 32-bit build after r367229.

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The use of atomic_sub_64() in zfs_zstd.c was breaking the 32-bit build on
platforms without native 64-bit atomics due to atomic_sub_64() not being
available, and no fallback being provided in _STANDALONE.

Provide a standalone stub to match atomic_add_64() using simple math.

While this is not actually atomic, it does not matter in libsa context,
since it always runs single-threaded and does not run under a scheduler.

Reviewed by: mjg (in email)
This commit is contained in:
Brandon Bergren 2020-10-31 21:11:34 +00:00
parent 59402cc58a
commit bd5e074531
1 changed files with 2 additions and 0 deletions
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2
sys/contrib/openzfs/include/os/freebsd/spl/sys/atomic.h
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@ -188,6 +188,8 @@ atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
*/
#undef atomic_add_64
#define atomic_add_64(ptr, val) *(ptr) += val
#undef atomic_sub_64
#define atomic_sub_64(ptr, val) *(ptr) -= val
#endif /* !_STANDALONE */
#endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */