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Provide a simple and trivial helper which just writes the PKRU default value without trying to fiddle with the task's xsave buffer. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121455.513729794@linutronix.de