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If ACPI_APEI_GHES is not configured the [un]register work functions are not properly declared. 0day notices that the cxl_cper_register_work() declaration in the CONFIG_ACPI_APEI_GHES=n is broken, fix it to be typical nop stub. Reported-by: kernel test robot <lkp@intel.com> Closes: http://lore.kernel.org/r/202405012230.6kXItWen-lkp@intel.com Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20240501-cper-fix-0day-v1-1-c0b0056eafbc@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>