On Tue, 11 Jul 2006 15:05:18 +0900
Fernando Luis Vázquez Cao <[email protected]> wrote:
> ...
With CONFIG_SMP=n:
arch/i386/kernel/crash.c: In function 'crash_save_self':
arch/i386/kernel/crash.c:91: warning: implicit declaration of function 'safe_smp_processor_id'
And it fails to link.
> --- linux-2.6.18-rc1/include/asm-i386/smp.h 2006-07-11 10:11:44.000000000 +0900
> +++ linux-2.6.18-rc1-sof/include/asm-i386/smp.h 2006-07-11 14:05:28.000000000 +0900
> @@ -89,12 +89,14 @@ static __inline int logical_smp_processo
>
> #endif
>
> +extern int safe_smp_processor_id(void);
> extern int __cpu_disable(void);
> extern void __cpu_die(unsigned int cpu);
> #endif /* !__ASSEMBLY__ */
>
> #else /* CONFIG_SMP */
>
> +#define safe_smp_processor_id() 0
> #define cpu_physical_id(cpu) boot_cpu_physical_apicid
>
> #define NO_PROC_ID 0xFF /* No processor magic marker */
The reason for this is that include/linux/smp.h only includes asm/smp.h if
CONFIG_SMP=y. This is not the cleverest thing we've ever done.
I fixed that in cowardly fashion:
--- a/arch/i386/kernel/crash.c~stack-overflow-safe-kdump-crash_use_safe_smp_processor_id-fix
+++ a/arch/i386/kernel/crash.c
@@ -23,6 +23,7 @@
#include <asm/hw_irq.h>
#include <asm/apic.h>
#include <asm/kdebug.h>
+#include <asm/smp.h>
#include <mach_ipi.h>
_
-
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