On 20.06.07 12:45:35, David Rientjes wrote:
> On Wed, 20 Jun 2007, Robert Richter wrote:
>
> > Index: linux-2.6.22-rc3/arch/x86_64/perfmon/perfmon_k8.c
> > ===================================================================
> > --- linux-2.6.22-rc3.orig/arch/x86_64/perfmon/perfmon_k8.c
> > +++ linux-2.6.22-rc3/arch/x86_64/perfmon/perfmon_k8.c
> > @@ -307,7 +307,12 @@ static int pfm_k8_probe_pmu(void)
> > return -1;
> > }
> >
> > - if (current_cpu_data.x86 != 15) {
> > + switch (current_cpu_data.x86) {
> > + case 15:
> > + case 16:
> > + PFM_INFO("found family=%d", current_cpu_data.x86);
> > + break;
> > + default:
> > PFM_INFO("unsupported family=%d", current_cpu_data.x86);
> > return -1;
> > }
>
> This still shouldn't be a switch clause because you're hiding the return
> -1; in the default label. I think it would be better to write:
>
> if (current_cpu_data.x86 == 15 || current_cpu_data.x86 == 16)
> PFM_INFO("found family=%d", current_cpu_data.x86);
> else {
> PFM_INFO("unsupported family=%d", current_cpu_data.x86);
> return -1;
> }
>
>
With the next CPU family the if condition would be too long while
adding another case statement is more readable. Anyway, things always
have 2 sides and I understand your concerns.
-Robert
--
AMD Saxony, Dresden, Germany
Operating System Research Center
email: [email protected]
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