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rust: update Ref to use the kernel's refcount_t. - #377
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Saturate the refcount instead of panicking. It also leverages existing C
code instead of reimplementing functionality.
This is the first step to deprecate
Arc(that aborts on overflow) andBTreeMap(that panics on allocation failure).Signed-off-by: Wedson Almeida Filho wedsonaf@google.com