x86/fpu: Mark various FPU state variables __ro_after_init
Nothing modifies these after booting. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NBorislav Petkov <bp@suse.de> Reviewed-by: NBorislav Petkov <bp@suse.de> Reviewed-by: NAndy Lutomirski <luto@kernel.org> Link: https://lkml.kernel.org/r/20210623121451.611751529@linutronix.de
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