x86/cacheinfo: Switch cache_ap_init() to hotplug callback

Instead of explicitly calling cache_ap_init() in
identify_secondary_cpu() use a CPU hotplug callback instead. By
registering the callback only after having started the non-boot CPUs
and initializing cache_aps_delayed_init with "true", calling
set_cache_aps_delayed_init() at boot time can be dropped.

It should be noted that this change results in cache_ap_init() being
called a little bit later when hotplugging CPUs. By using a new
hotplug slot right at the start of the low level bringup this is not
problematic, as no operations requiring a specific caching mode are
performed that early in CPU initialization.

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20221102074713.21493-15-jgross@suse.com
Signed-off-by: Borislav Petkov <bp@suse.de>

This commit is contained in:

Juergen Gross

2022-11-02 08:47:11 +01:00

committed by

Borislav Petkov

parent adfe7512e1

commit 30f89e524b

5 changed files with 16 additions and 7 deletions

									
										include/linux/cpuhotplug.h
									
		+1
		
												View File
												
				@@ -140,6 +140,7 @@ enum cpuhp_state {

					 */

					CPUHP_AP_IDLE_DEAD,

					CPUHP_AP_OFFLINE,

					CPUHP_AP_CACHECTRL_STARTING,

					CPUHP_AP_SCHED_STARTING,

					CPUHP_AP_RCUTREE_DYING,

					CPUHP_AP_CPU_PM_STARTING,