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* doc/coreutils.texi (dd invocation): Warn that noatime might not be reliable. * src/dd.c (flags, usage): Look at O_NOATIME, not HAVE_WORKING_O_NOATIME, to decide whether to support the noatime flag, so that dd attempts O_NOATIME even if the build file system does not support it. Problem reported by Jim Meyering today in bug-coreutils. * tests/dd/misc: Generate a warning, not a failure, if noatime exists but fails.