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Fix tcmulib get next command on aarch64
Use the appropriate atomic load instruction to ensure we synchronize the read of the command ring head index with any previous stores. Not doing this causes command ring corruption on aarch64: [Tue Oct 4 15:45:50 2022] cmd_id 0 not found, ring is broken [Tue Oct 4 15:45:50 2022] ring broken, not handling completions See issue open-iscsi#688. PR open-iscsi#693. Signed-off-by: Xiubo Li <[email protected]>
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