linux-kernel - [PATCH 3/5] Use the APIC to determine the hardware processor id

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Date:	Thu, 01 Mar 2007 16:17:49 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	fastboot@...ts.osdl.org, ebiederm@...ssion.com, ak@...e.de,
	akpm@...ux-foundation.org, judith@...ux-foundation.org
Subject: [PATCH 3/5] Use the APIC to determine the hardware processor id -
	x86_64

Use the APIC to determine the hardware processor id in both UP and SMP
kernels.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urNp linux-2.6.21-rc2/include/asm-x86_64/smp.h linux-2.6.21-rc2-hwcpuid/include/asm-x86_64/smp.h
--- linux-2.6.21-rc2/include/asm-x86_64/smp.h	2007-02-05 03:44:54.000000000 +0900
+++ linux-2.6.21-rc2-hwcpuid/include/asm-x86_64/smp.h	2007-03-07 12:42:47.000000000 +0900
@@ -58,12 +58,6 @@ static inline int num_booting_cpus(void)
 
 #define raw_smp_processor_id() read_pda(cpunumber)
 
-static inline int hard_smp_processor_id(void)
-{
-	/* we don't want to mark this access volatile - bad code generation */
-	return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
-}
-
 extern int __cpu_disable(void);
 extern void __cpu_die(unsigned int cpu);
 extern void prefill_possible_map(void);
@@ -72,7 +66,13 @@ extern unsigned disabled_cpus;
 
 #define NO_PROC_ID		0xFF		/* No processor magic marker */
 
-#endif
+#endif /* CONFIG_SMP */
+
+static inline int hard_smp_processor_id(void)
+{
+	/* we don't want to mark this access volatile - bad code generation */
+	return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
+}
 
 /*
  * Some lowlevel functions might want to know about


-
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