Re: [PATCH 2/2] apic: Add print error interrupt reason

[Joe Perches <joe@perches.com>]

On Thu, 2011-01-06 at 11:28 +0800, Youquan Song wrote:
> End user worry about the error interrupt information and intend to know what
> kind of error interrupts are generated, so this patch add printing out the
> detail debug information of error interrupt. 
> 
> Signed-off-by: Youquan Song <youquan.song@intel.com>
> ---
>  arch/x86/kernel/apic/apic.c |   28 +++++++++++++++++++++++++++-
>  1 files changed, 27 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
[]
> +static const char *error_interrupt_reason[] = {

static const char * const etc[]

> +	"Send CS error",
> +	"Receive CS error",
> +	"Send accept error",
> +	"Receive accept error",
> +	"Redirectable IPI",
> +	"Send illegal vector",
> +	"Received illegal vector",
> +	"Illegal register address",
> +};
> +
> +static void print_error_interrupt_reason(u32 reason)
> +{
> +	u32 i = 0;
> +	reason = reason & 0xff;
> +	do {
> +		if (reason & 0x1)
> +			pr_debug(" : %s", error_interrupt_reason[i]);

This isn't correct as it will emit <7> for each reason.

You want pr_cont surrounded by #ifdef DEBUG
or some new #define pr_debug_cont in printk.h
but that won't play well with dynamic_debug.

Jason?  Got a cure for this?