Messages in this thread Patch in this message | | | Date | Tue, 11 Jul 2006 23:46:05 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 1/4] stack overflow safe kdump (2.6.18-rc1-i386) - safe_smp_processor_id |
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On Tue, 11 Jul 2006 15:05:18 +0900 Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> 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> _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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