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agblklog could plausibly be 32, but that would overflow this shift. Perform the shift as ULL and cast to u32 at the end instead. This is part of XSA-443 / CVE-2023-34325 Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com> Acked-by: Jan Beulich <jbeulich@suse.com>