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yaml --- r: 136678 b: refs/heads/master c: fdbecd9 h: refs/heads/master v: v3
git-mirror · Feb 5, 2009 · 6ebe707 · 6ebe707
1 parent 936e238
commit 6ebe707
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Showing 2 changed files with 16 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 65a4e574d2382d83f71b30ea92f86d2e40a6ef8d
+refs/heads/master: fdbecd9fd14198853bec4cbae8bc7af93f2e3de3
diff --git a/trunk/arch/x86/kernel/apic.c b/trunk/arch/x86/kernel/apic.c
@@ -50,13 +50,26 @@
 #include <asm/smp.h>
 
 unsigned int num_processors;
+
 unsigned disabled_cpus __cpuinitdata;
+
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
-EXPORT_SYMBOL(boot_cpu_physical_apicid);
+
+/*
+ * The highest APIC ID seen during enumeration.
+ *
+ * This determines the messaging protocol we can use: if all APIC IDs
+ * are in the 0 ... 7 range, then we can use logical addressing which
+ * has some performance advantages (better broadcasting).
+ *
+ * If there's an APIC ID above 8, we use physical addressing.
+ */
 unsigned int max_physical_apicid;
 
-/* Bitmask of physically existing CPUs */
+/*
+ * Bitmask of physically existing CPUs:
+ */
 physid_mask_t phys_cpu_present_map;
 
 /*