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Resctrl open codes a search for information about a given cache level in a couple of places (and more are on the way). Provide a new inline function get_cpu_cacheinfo_level() in <linux/cacheinfo.h> to do the search and return a pointer to the cacheinfo structure. Add lockdep_assert_cpus_held() to enforce the comment that cpuhp lock must be held. Simplify the existing get_cpu_cacheinfo_id() by using this new function to do the search. Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://lore.kernel.org/r/20240610003927.341707-4-tony.luck@intel.com