Re: [Xen-devel] [v2][PATCH] xen/apic: refactor error_interrupt

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 06/05/2015 07:27, Tiejun Chen wrote:
> Just make this readable while debugging.
>
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>

Almost, but there is one issue.

> ---
> v2:
>
> * Tried to refine code according to comments.
>
>  xen/arch/x86/apic.c | 30 ++++++++++++++++++------------
>  1 file changed, 18 insertions(+), 12 deletions(-)
>
> diff --git a/xen/arch/x86/apic.c b/xen/arch/x86/apic.c
> index 3217bdf..b9f53df 100644
> --- a/xen/arch/x86/apic.c
> +++ b/xen/arch/x86/apic.c
> @@ -1319,9 +1319,21 @@ out: ;
>   * This interrupt should never happen with our APIC/SMP architecture
>   */
>  
> +static const char * const esr_fields[] =
> +{
> +    "Send CS error",
> +    "Receive CS error",
> +    "Send accept error",
> +    "Receive accept error",
> +    "Redirectable IPI",
> +    "Send illegal vector",
> +    "Received illegal vector",
> +    "Illegal register address",
> +};
> +
>  void error_interrupt(struct cpu_user_regs *regs)
>  {
> -    unsigned long v, v1;
> +    unsigned int v, v1, i;
>  
>      /* First tickle the hardware, only then report what went on. -- REW */
>      v = apic_read(APIC_ESR);
> @@ -1329,18 +1341,12 @@ void error_interrupt(struct cpu_user_regs *regs)
>      v1 = apic_read(APIC_ESR);
>      ack_APIC_irq();
>  
> -    /* Here is what the APIC error bits mean:
> -       0: Send CS error
> -       1: Receive CS error
> -       2: Send accept error
> -       3: Receive accept error
> -       4: Reserved
> -       5: Send illegal vector
> -       6: Received illegal vector
> -       7: Illegal register address
> -    */
> -    printk (KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n",
> +    printk(XENLOG_DEBUG "APIC error on CPU%u: %02x(%02x)",
>              smp_processor_id(), v , v1);
> +    for ( i = 7; i >= 0; --i )

As the patch currently goes, i is unsigned making this an infinite loop.

Swap i to be a regular int, and Reviewed-by: Andrew Cooper
<andrew.cooper3@xxxxxxxxxx>

> +        if ( v1 & (1 << i) )
> +            printk(", %s", esr_fields[i]);
> +    printk("\n");
>  }
>  
>  /*


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