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authorFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>2007-05-09 02:33:27 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 12:30:48 -0700
commita36166c6ef45081fea6eeaf5ca785d7ed786b6e2 (patch)
treebdb5a99e3c80883cbb84d6e190b4dabefec79032 /include/asm-i386
parent2f4dfe206a2fc07099dfad77a8ea2f4b4ae2140f (diff)
downloadlinux-2.6.34-ux500-a36166c6ef45081fea6eeaf5ca785d7ed786b6e2.tar.gz
Use the APIC to determine the hardware processor id - i386
hard_smp_processor_id used to be just a macro that hard-coded hard_smp_processor_id to 0 in the non SMP case. When booting non SMP kernels on hardware where the boot ioapic id is not 0 this turns out to be a problem. This is happens frequently in the case of kdump and once in a great while in the case of real hardware. Use the APIC to determine the hardware processor id in both UP and SMP kernels to fix this issue. Notice that hard_smp_processor_id is only used by SMP code or by code that works with apics so we do not need to handle the case when apics are not present and hard_smp_processor_id should never be called there. Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Acked-by: Andi Kleen <ak@suse.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/smp.h36
1 files changed, 21 insertions, 15 deletions
diff --git a/include/asm-i386/smp.h b/include/asm-i386/smp.h
index 3243fa6f455..0c713278706 100644
--- a/include/asm-i386/smp.h
+++ b/include/asm-i386/smp.h
@@ -124,20 +124,6 @@ static inline int num_booting_cpus(void)
return cpus_weight(cpu_callout_map);
}
-#ifdef CONFIG_X86_LOCAL_APIC
-
-#ifdef APIC_DEFINITION
-extern int hard_smp_processor_id(void);
-#else
-#include <mach_apicdef.h>
-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 long *)(APIC_BASE+APIC_ID));
-}
-#endif
-#endif
-
extern int safe_smp_processor_id(void);
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
@@ -147,7 +133,6 @@ extern unsigned int num_processors;
#else /* CONFIG_SMP */
-#define hard_smp_processor_id() 0
#define safe_smp_processor_id() 0
#define cpu_physical_id(cpu) boot_cpu_physical_apicid
@@ -157,6 +142,27 @@ extern unsigned int num_processors;
#ifndef __ASSEMBLY__
+#ifdef CONFIG_X86_LOCAL_APIC
+
+#ifdef APIC_DEFINITION
+extern int hard_smp_processor_id(void);
+#else
+#include <mach_apicdef.h>
+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 long *)(APIC_BASE+APIC_ID));
+}
+#endif /* APIC_DEFINITION */
+
+#else /* CONFIG_X86_LOCAL_APIC */
+
+#ifndef CONFIG_SMP
+#define hard_smp_processor_id() 0
+#endif
+
+#endif /* CONFIG_X86_LOCAL_APIC */
+
extern u8 apicid_2_node[];
#ifdef CONFIG_X86_LOCAL_APIC