Re: [BUG] next-20081216 - WARNING: at kernel/smp.c:333smp_call_function_mask

[Kamalesh Babulal]

* Ingo Molnar <mingo@xxxxxxx> [2008-12-27 13:26:32]:

> 
> * Kamalesh Babulal <kamalesh@xxxxxxxxxxxxxxxxxx> wrote:
> 
> > > yes, indeed - updated patch below.
> > > 
> > > 	Ingo
> > > 
> > 
> > Hi Ingo,
> > 
> > 	Sorry, for not mentioning that the previous kernel trace, was 
> > after adding the return statement to the arch_init_chip_data().
> 
> ah, i missed that detail. There was a stupid typo in one of the conflict 
> resolutions i had to do - could you check the updated patch below?
> 
> Thanks,
> 
> 	Ingo
>


Hi Ingo,

	kernel still crashes, with the updated patch.


> ----------->
> From 13a0c3c269b223f60abfac8a9811d77111a8b4ba Mon Sep 17 00:00:00 2001
> From: Yinghai Lu <yinghai@xxxxxxxxxx>
> Date: Fri, 26 Dec 2008 02:05:47 -0800
> Subject: [PATCH] sparseirq: work around compiler optimizing away __weak functions
> 
> Impact: fix panic on null pointer with sparseirq
> 
> Some GCC versions seem to inline the weak global function,
> when that function is empty.
> 
> Work it around, by making the functions return a (dummy) integer.
> 
> Signed-off-by: Yinghai <yinghai@xxxxxxxxxx>
> Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
> ---
>  arch/x86/kernel/io_apic.c |    8 ++++++--
>  include/linux/irq.h       |    6 +++---
>  init/main.c               |    7 ++++---
>  kernel/irq/handle.c       |    7 ++++---
>  4 files changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
> index 2fe543f..9760393 100644
> --- a/arch/x86/kernel/io_apic.c
> +++ b/arch/x86/kernel/io_apic.c
> @@ -170,7 +170,7 @@ static struct irq_cfg irq_cfgx[NR_IRQS] = {
>  	[15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
>  };
> 
> -void __init arch_early_irq_init(void)
> +int __init arch_early_irq_init(void)
>  {
>  	struct irq_cfg *cfg;
>  	struct irq_desc *desc;
> @@ -184,6 +184,8 @@ void __init arch_early_irq_init(void)
>  		desc = irq_to_desc(i);
>  		desc->chip_data = &cfg[i];
>  	}
> +
> +	return 0;
>  }
> 
>  #ifdef CONFIG_SPARSE_IRQ
> @@ -212,7 +214,7 @@ static struct irq_cfg *get_one_free_irq_cfg(int cpu)
>  	return cfg;
>  }
> 
> -void arch_init_chip_data(struct irq_desc *desc, int cpu)
> +int arch_init_chip_data(struct irq_desc *desc, int cpu)
>  {
>  	struct irq_cfg *cfg;
> 
> @@ -224,6 +226,8 @@ void arch_init_chip_data(struct irq_desc *desc, int cpu)
>  			BUG_ON(1);
>  		}
>  	}
> +
> +	return 0;
>  }
> 
>  #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index 69da275..0e40af4 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -193,9 +193,9 @@ struct irq_desc {
>  	const char		*name;
>  } ____cacheline_internodealigned_in_smp;
> 
> -extern void early_irq_init(void);
> -extern void arch_early_irq_init(void);
> -extern void arch_init_chip_data(struct irq_desc *desc, int cpu);
> +extern int early_irq_init(void);
> +extern int arch_early_irq_init(void);
> +extern int arch_init_chip_data(struct irq_desc *desc, int cpu);
>  extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
>  					struct irq_desc *desc, int cpu);
>  extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
> diff --git a/init/main.c b/init/main.c
> index c1f999a..c314aa1 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -539,13 +539,14 @@ void __init __weak thread_info_cache_init(void)
>  {
>  }
> 
> -void __init __weak arch_early_irq_init(void)
> +int __init __weak arch_early_irq_init(void)
>  {
> +	return 0;
>  }
> 
> -void __init __weak early_irq_init(void)
> +int __init __weak early_irq_init(void)
>  {
> -	arch_early_irq_init();
> +	return arch_early_irq_init();
>  }
> 
>  asmlinkage void __init start_kernel(void)
> diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
> index 893da67..0bef3ec 100644
> --- a/kernel/irq/handle.c
> +++ b/kernel/irq/handle.c
> @@ -86,8 +86,9 @@ void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
>  		desc->kstat_irqs = (unsigned int *)ptr;
>  }
> 
> -void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
> +int __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
>  {
> +	return 0;
>  }
> 
>  static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
> @@ -132,7 +133,7 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm
>  /* FIXME: use bootmem alloc ...*/
>  static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
> 
> -void __init early_irq_init(void)
> +int __init early_irq_init(void)
>  {
>  	struct irq_desc *desc;
>  	int legacy_count;
> @@ -151,7 +152,7 @@ void __init early_irq_init(void)
>  	for (i = legacy_count; i < NR_IRQS; i++)
>  		irq_desc_ptrs[i] = NULL;
> 
> -	arch_early_irq_init();
> +	return arch_early_irq_init();
>  }
> 
>  struct irq_desc *irq_to_desc(unsigned int irq)
> 
> --
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-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
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