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x86/paravirt: switch functions with custom code to ALTERNATIVE
Instead of using paravirt patching for custom code sequences use ALTERNATIVE for the functions with custom code replacements. Instead of patching an ud2 instruction for unpopulated vector entries into the caller site, use a simple function just calling BUG() as a replacement. Signed-off-by: Juergen Gross <jgross@suse.com>
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