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Suppress non-error messages when applying new bootconfig to initrd image. To enable it, replace printf for error message with pr_err() macro. This also adds a testcase for this fix. Link: http://lkml.kernel.org/r/158125351377.16911.13283712972275131160.stgit@devnote2 Reported-by: Michael Ellerman <[email protected]> Tested-by: Michael Ellerman <[email protected]> Signed-off-by: Masami Hiramatsu <[email protected]> Signed-off-by: Steven Rostedt (VMware) <[email protected]>