Re: [PATCH] kexec: force x86_64 arches to boot kdump kernels on boot cpu

[Andi Kleen <ak@suse.de>]

> +	htcfg = read_pci_config(num, slot, func, 0x68);
> +	if (htcfg & (1 << 18)) {	
> +		printk(KERN_INFO "Detected use of extended apic ids on hypertransport bus\n");
> +		if ((htcfg & (1 << 17)) == 0) {
> +			printk(KERN_INFO "Enabling hypertransport extended apic interrupt broadcast\n");
> +			printk(KERN_INFO "Note this is a bios bug, please contact your hw vendor\n");

I'm not convinced the message is correct. e.g. on a system with only a dual core not enabling
that is fine, but the extended IDs might be still set.

>  #endif /* CONFIG_ACPI */
>  
> -static void __init nvidia_bugs(void)
> +static void __init nvidia_bugs(int num, int slot, int func)
>  {
> +	static int fix_applied = 0;
> +
> +	if (fix_applied++)
> +		return;

This looks like the wrong place to do this. Better add a flag or something
in the structure. Dito others.

Also while not a problem here in general it's bad style to add potential
wrapping bugs like this. Never use ++ for flags.

-Andi

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