Re: [Xen-devel] [PATCH v2 1/6] xen: Always calculate max_cpus value

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.08.12 at 15:25, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
> max_cpus is not available since 20374 changeset (Miscellaneous data
> placement adjustments). It was moved to __initdata section. This section
> is freed after Xen initialization. Assume that max_cpus is always
> equal to XEN_HYPER_SIZE(cpumask_t) * 8.

Just to repeat my response to the original version of this patch,
which I don't recall having got any answer from you:

"Using nr_cpu_ids, when available, would seem a better fit. And
 I don't see why, on dumps from old hypervisors, you wouldn't
 want to continue using max_cpus. Oh, wait, I see - you would
 have to be able to tell whether it actually sits in .init.data, which
 might not be strait forward."

Jan

> Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> 
> diff -Npru crash-6.0.8.orig/xen_hyper.c crash-6.0.8/xen_hyper.c
> --- crash-6.0.8.orig/xen_hyper.c      2012-06-29 16:59:18.000000000 +0200
> +++ crash-6.0.8/xen_hyper.c   2012-07-05 14:52:59.000000000 +0200
> @@ -1879,11 +1879,9 @@ xen_hyper_get_cpu_info(void)
>       uint *cpu_idx;
>       int i, j, cpus;
>  
> -     get_symbol_data("max_cpus", sizeof(xht->max_cpus), &xht->max_cpus);
>       XEN_HYPER_STRUCT_SIZE_INIT(cpumask_t, "cpumask_t");
> -     if (XEN_HYPER_SIZE(cpumask_t) * 8 > xht->max_cpus) {
> -             xht->max_cpus = XEN_HYPER_SIZE(cpumask_t) * 8;
> -     }
> +     xht->max_cpus = XEN_HYPER_SIZE(cpumask_t) * 8;
> +
>       if (xht->cpumask) {
>               free(xht->cpumask);
>       }




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