x86/mtrr: Let cache_aps_delayed_init replace mtrr_aps_delayed_init

In order to prepare decoupling MTRR and PAT replace the MTRR-specific
mtrr_aps_delayed_init flag with a more generic cache_aps_delayed_init
one.

Signed-off-by: Juergen Gross <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Borislav Petkov <[e-mail]>

arch/x86/include/asm/cacheinfo.h

···
 void cache_disable(void);
 void cache_enable(void);
 void cache_cpu_init(void);
+void set_cache_aps_delayed_init(bool val);
+bool get_cache_aps_delayed_init(void);
 
 #endif /* _ASM_X86_CACHEINFO_H */

arch/x86/include/asm/mtrr.h

···
 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
 extern void mtrr_ap_init(void);
-extern void set_mtrr_aps_delayed_init(void);
 extern void mtrr_aps_init(void);
 extern void mtrr_bp_restore(void);
 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
···
 {
 }
 #define mtrr_ap_init() do {} while (0)
-#define set_mtrr_aps_delayed_init() do {} while (0)
 #define mtrr_aps_init() do {} while (0)
 #define mtrr_bp_restore() do {} while (0)
 #define mtrr_disable() do {} while (0)

arch/x86/kernel/cpu/cacheinfo.c

···
 	cache_enable();
 	local_irq_restore(flags);
 }
+
+static bool cache_aps_delayed_init;
+
+void set_cache_aps_delayed_init(bool val)
+{
+	cache_aps_delayed_init = val;
+}
+
+bool get_cache_aps_delayed_init(void)
+{
+	return cache_aps_delayed_init;
+}

arch/x86/kernel/cpu/mtrr/mtrr.c

···
 static DEFINE_MUTEX(mtrr_mutex);
 
 u64 size_or_mask, size_and_mask;
-static bool mtrr_aps_delayed_init;
 
 static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM] __ro_after_init;
 
···
 	if (data->smp_reg != ~0U) {
 		mtrr_if->set(data->smp_reg, data->smp_base,
 			     data->smp_size, data->smp_type);
-	} else if (mtrr_aps_delayed_init || !cpu_online(smp_processor_id())) {
+	} else if (get_cache_aps_delayed_init() ||
+		   !cpu_online(smp_processor_id())) {
 		cache_cpu_init();
 	}
 	return 0;
···
 
 void mtrr_ap_init(void)
 {
-	if (!memory_caching_control || mtrr_aps_delayed_init)
+	if (!memory_caching_control || get_cache_aps_delayed_init())
 		return;
 
 	/*
···
 	smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
 }
 
-void set_mtrr_aps_delayed_init(void)
-{
-	if (!memory_caching_control)
-		return;
-
-	mtrr_aps_delayed_init = true;
-}
-
 /*
  * Delayed MTRR initialization for all AP's
  */
···
 	 * by doing set_mtrr_aps_delayed_init(), prior to this point. If not,
 	 * then we are done.
 	 */
-	if (!mtrr_aps_delayed_init)
+	if (!get_cache_aps_delayed_init())
 		return;
 
 	set_mtrr(~0U, 0, 0, 0);
-	mtrr_aps_delayed_init = false;
+	set_cache_aps_delayed_init(false);
 }
 
 void mtrr_bp_restore(void)

arch/x86/kernel/smpboot.c

···
 #include <linux/overflow.h>
 
 #include <asm/acpi.h>
+#include <asm/cacheinfo.h>
 #include <asm/desc.h>
 #include <asm/nmi.h>
 #include <asm/irq.h>
···
 
 	uv_system_init();
 
-	set_mtrr_aps_delayed_init();
+	set_cache_aps_delayed_init(true);
 
 	smp_quirk_init_udelay();
 
···
 
 void arch_thaw_secondary_cpus_begin(void)
 {
-	set_mtrr_aps_delayed_init();
+	set_cache_aps_delayed_init(true);
 }
 
 void arch_thaw_secondary_cpus_end(void)