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If the shm region is not mapped at shmaddr, EINVAL. Do not unmap the region until the syscall succeeds. Use mmap_reserve_or_unmap to preserve reserved_va semantics. Tested-by: Helge Deller <[email protected]> Reviewed-by: Philippe Mathieu-Daudé <[email protected]> Signed-off-by: Richard Henderson <[email protected]>
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