[Xen-devel] [PATCH v6 06/12] x86/apic: Mark the apic_intr_mode extern for sanity check cleanup

[Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>]

Calling native_smp_prepare_cpus() to prepare for SMP bootup, does
some sanity checking, enables APIC mode and disables SMP feature.

Now, APIC mode setup has been unified to apic_intr_mode_init(),
some sanity checks are redundant and need to be cleanup.

Mark the apic_intr_mode extern to refine the switch and remove
the redundant sanity check.

Signed-off-by: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
---
 arch/x86/include/asm/apic.h |  9 +++++++
 arch/x86/kernel/apic/apic.c | 12 ++++------
 arch/x86/kernel/smpboot.c   | 57 +++++++--------------------------------------
 3 files changed, 22 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index c3bedbd..bfbf715 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -53,6 +53,15 @@ extern int local_apic_timer_c2_ok;
 extern int disable_apic;
 extern unsigned int lapic_timer_frequency;
 
+extern enum apic_intr_mode_id apic_intr_mode;
+enum apic_intr_mode_id {
+       APIC_PIC,
+       APIC_VIRTUAL_WIRE,
+       APIC_VIRTUAL_WIRE_NO_CONFIG,
+       APIC_SYMMETRIC_IO,
+       APIC_SYMMETRIC_IO_NO_ROUTING
+};
+
 #ifdef CONFIG_SMP
 extern void __inquire_remote_apic(int apicid);
 #else /* CONFIG_SMP */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 4e24aaf..8cae32c 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1157,13 +1157,7 @@ void __init sync_Arb_IDs(void)
                        APIC_INT_LEVELTRIG | APIC_DM_INIT);
 }
 
-enum apic_intr_mode {
-       APIC_PIC,
-       APIC_VIRTUAL_WIRE,
-       APIC_VIRTUAL_WIRE_NO_CONFIG,
-       APIC_SYMMETRIC_IO,
-       APIC_SYMMETRIC_IO_NO_ROUTING,
-};
+enum apic_intr_mode_id apic_intr_mode;
 
 static int __init apic_intr_mode_select(void)
 {
@@ -1289,7 +1283,9 @@ void __init apic_intr_mode_init(void)
 {
        bool upmode = false;
 
-       switch (apic_intr_mode_select()) {
+       apic_intr_mode = apic_intr_mode_select();
+
+       switch (apic_intr_mode) {
        case APIC_PIC:
                pr_info("APIC: keep in PIC mode(8259)\n");
                return;
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a4b072d..b40cf59 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1183,17 +1183,10 @@ static __init void disable_smp(void)
        cpumask_set_cpu(0, topology_core_cpumask(0));
 }
 
-enum {
-       SMP_OK,
-       SMP_NO_CONFIG,
-       SMP_NO_APIC,
-       SMP_FORCE_UP,
-};
-
 /*
  * Various sanity checks.
  */
-static int __init smp_sanity_check(unsigned max_cpus)
+static void __init smp_sanity_check(void)
 {
        preempt_disable();
 
@@ -1231,16 +1224,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
        }
 
        /*
-        * If we couldn't find an SMP configuration at boot time,
-        * get out of here now!
-        */
-       if (!smp_found_config && !acpi_lapic) {
-               preempt_enable();
-               pr_notice("SMP motherboard not detected\n");
-               return SMP_NO_CONFIG;
-       }
-
-       /*
         * Should not be necessary because the MP table should list the boot
         * CPU too, but we do it for the sake of robustness anyway.
         */
@@ -1250,29 +1233,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
                physid_set(hard_smp_processor_id(), phys_cpu_present_map);
        }
        preempt_enable();
-
-       /*
-        * If we couldn't find a local APIC, then get out of here now!
-        */
-       if (APIC_INTEGRATED(boot_cpu_apic_version) &&
-           !boot_cpu_has(X86_FEATURE_APIC)) {
-               if (!disable_apic) {
-                       pr_err("BIOS bug, local APIC #%d not detected!...\n",
-                               boot_cpu_physical_apicid);
-                       pr_err("... forcing use of dummy APIC emulation (tell 
your hw vendor)\n");
-               }
-               return SMP_NO_APIC;
-       }
-
-       /*
-        * If SMP should be disabled, then really disable it!
-        */
-       if (!max_cpus) {
-               pr_info("SMP mode deactivated\n");
-               return SMP_FORCE_UP;
-       }
-
-       return SMP_OK;
 }
 
 static void __init smp_cpu_index_default(void)
@@ -1331,19 +1291,20 @@ void __init native_smp_prepare_cpus(unsigned int 
max_cpus)
 
        apic_intr_mode_init();
 
-       switch (smp_sanity_check(max_cpus)) {
-       case SMP_NO_CONFIG:
-               disable_smp();
-               return;
-       case SMP_NO_APIC:
+       smp_sanity_check();
+
+       switch (apic_intr_mode) {
+       case APIC_PIC:
+       case APIC_VIRTUAL_WIRE_NO_CONFIG:
                disable_smp();
                return;
-       case SMP_FORCE_UP:
+       case APIC_SYMMETRIC_IO_NO_ROUTING:
                disable_smp();
                /* Setup local timer */
                x86_init.timers.setup_percpu_clockev();
                return;
-       case SMP_OK:
+       case APIC_VIRTUAL_WIRE:
+       case APIC_SYMMETRIC_IO:
                break;
        }
 
-- 
2.5.5




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