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Detect and store NULL links as zero offsets into the shared AVL tree. Otherwise, non-constant offsets may be generated for representing a NULL link, depending on the process-specific start address of the pshared AVL tree in memory as obtained from a memory mapping. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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