[LU-18234] fail to build lustre client due to macros 'HAVE_HOTPLUG_STATE_MACHINE'

• Type: Bug
• Resolution: Unresolved
• Priority: Critical
• Affects Version/s: Lustre 2.15.4, Lustre 2.15.5
• Labels: build
• Environment: OS： ; AlmaLinux release 8.9 ; ; kernel： ; 4.18.0-513.5.1.el8_9.x86_64 ; ; lustre： ; 2.15.4

Epic/Theme

ldiskfs libcfs

• Severity: 1
• Assignee: WC Triage
• Reporter: Fu Gen

Description

compile error:
libcfs/libcfs/libcfs_cpu.c:1162:7: error: 'CPU_ONLINE_FROZEN' undeclared
libcfs/libcfs/libcfs_cpu.c:1194:2: error: implicit declaration of function 'unregister_hotcpu_notifier';

person analysis:
starting from Linux kernel 4.10, support for 'HAVE_HOTPLUG_STATE_MACHINE' related functions has been removed. However, when compiling libcfs/libcfs/libcfs_cpu. c, the old functions are still used:

void cfs_cpu_fini(void)
{
        if (!IS_ERR_OR_NULL(cfs_cpt_tab))
                cfs_cpt_table_free(cfs_cpt_tab);#ifdef CONFIG_HOTPLUG_CPU
#ifdef HAVE_HOTPLUG_STATE_MACHINE
        if (cstorpfs_cpu_online > 0)
                cpuhp_remove_state_nocalls(cstorpfs_cpu_online);
        cpuhp_remove_state_nocalls(CPUHP_CSTORPFS_CFS_DEAD);
#else
        unregister_hotcpu_notifier(&cfs_cpu_notifier);
#endif /* !HAVE_HOTPLUG_STATE_MACHINE */
#endif /* CONFIG_HOTPLUG_CPU */
}